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Journal articles on the topic 'Gerbera'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 January 2023

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1

Rudnicki, R. M., and J. Nowak. "Vase-life of Gerbera jamesonii Bolus cut flowers depending upon; media, mineral nutrition, their morphological attributes and treatment with flower preservative." Acta Agrobotanica 29, no. 2 (2015): 289–96. http://dx.doi.org/10.5586/aa.1976.022.

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The correlations among different media, mineral nutrition and morphological features of gerbera flowers in relation to their vase-life period investigated. The bast medium for longevity of cut gerbera flowers was the mixture of composted pine bark and peat moss fertilized with N – 250 mg/1 and Mg – 150 mg/1. It was found that cut gerberas lasted longer when they were the Alkemade type, i.e. with wide petals. Yellow flowers remained fresh longer than red and pink ones. It was also found that the vase-life period of gerberas directly correlated with the length of floral stalk, its ability to grow and the inflorescence diameter. The solution of flower preservative Proflovit-72 was effective 'in extending life at room temperature and improved the quality and longevity of flowers which were previously in coldstorage for 1 to 3 weeks.
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2

Cardoso, Jean Carlos, and Ana Carolina Petit Inthurn. "Easy and efficient chemical sterilization of the culture medium for in vitro growth of gerbera using chlorine dioxide (ClO2)." Ornamental Horticulture 24, no. 3 (September 18, 2018): 218–24. http://dx.doi.org/10.14295/oh.v24i3.1222.

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Micropropagation techniques changed the production of clonal plantlets in the world. However, the high costs of micropropagated plantlets continue as the main constraint for the expansion of the technique. This paper aimed to test the use of the chemical sterilization of culture medium using chlorine dioxide (ClO2) for in vitro cultivation of gerbera. There was used gerbera in vitro shoots in the stage of rooting for these experiments, using 0.0035%, 0.0070% and 0.0105% of chlorine dioxide in the culture medium. Also, peracetic acid was tested previously for sterilization, but resulted in microbial contamination. Chemical sterilization of the culture medium was successfully using ClO2 at 0.0035% to 0.0105% (100% decontamination) at rooting and elongation stage of gerbera with production of plantlets with similar (number of leaves, total and root fresh weight) or higher quality (mainly aerial part) at rooting/elongation stage, compared with autoclaved culture medium. The increase of concentration of ClO2 also resulted in increasing of height and fresh weight of aerial part of gerberas. The ClO2 could replace the autoclaving with production of sterilized culture medium without phytotoxic problems to gerbera in vitro cultivation.
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3

Bhargava, Bhavya, Dr B. S. Dilta Dr. B. S. Dilta, Y. C. Gupta Y.C. Gupta, S. R. Dhiman S.R. Dhiman, and Manju Modgil. "Studies on micropropagation of gerbera (Gerbera jamesonii Bolus)." Indian Journal of Applied Research 3, no. 11 (October 1, 2011): 8–11. http://dx.doi.org/10.15373/2249555x/nov2013/4.

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4

Couto, Tarcisio Rangel do, João Sebastião de Paula Araujo, and João Paulo de Lima Aguilar. "Balanço hormonal auxina/citocinica para multiplicação in vitro de genótipos de gérbera." Revista Agraria Academica 4, no. 1 (January 1, 2021): 119–34. http://dx.doi.org/10.32406/v4n12021/119-134/agrariacad.

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Gerbera is used as a cut flower and has gained popularity as ornamental flower and great demand in the world market for ornamental plants. Micropropagation is used to meet the demand for commercial planting material. The objective was to evaluate the BAP and ANA phytoregulators effect gerberas in vitro multiplication. The explants were inoculated in MS culture medium containing different concentrations of BAP (0.0; 2.22; 4.44; 8.88 and 17.76 µmol L-1) and ANA (0.0; 1.34; 2.68 and 5.36 µmol L-1). After eight weeks, the number of shoots formed in each explant and the average length of the shoots were evaluated. Was possible to establish and recommend an ideal concentration of BAP and ANA for each gerbera genotype.
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5

Cardoso, Raquel DL, Simone M. Scheffer-Basso, and Magali F. Grando. "Proposal for commercial classification of the gerbera capitulum based in the flower overlap index." Horticultura Brasileira 28, no. 2 (June 2010): 214–17. http://dx.doi.org/10.1590/s0102-05362010000200013.

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The aim of this work was to propose a methodology for commercial classification of gerbera´s capitulum based on the trans flowers overlap coefficient. Three to eight capitula of twenty-eight cultivars of gerbera cut flower and seven non-commercial accesses were used. The width measurement of the trans flowers group (internal ray flower) as well as the sum of the width of the trans and ray flowers (external ray flower) groups were taken from each capitulum. The average of each access and the overlap coefficient were calculated (CS = width of the trans flowers group / Σ of the width of the trans and ray flowers groups) and submitted to the multivariate analysis, to verify the grouping by the average Euclidian distance matrix. It is proposed that gerberas with CS= 0.01 to 0.15 be classified as simple, CS= 0.16 to 0.40 as semi-double and CS superior to 0.41 as double. The overlap coefficient (CS) can be used to systematize the classification of the gerbera capitula, reducing the divergences in the classification and the subjectivity in the decisions of producers, florists and breeders.
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6

Anttila, Ulla, Paula Elomaa, Heikki Hokkanen, and Teemu Teeri. "Gerberan karvasaineet suojaavat hyönteisherbivorialta." Suomen Maataloustieteellisen Seuran Tiedote, no. 26 (January 31, 2010): 1–5. http://dx.doi.org/10.33354/smst.76911.

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Gerbera hybrida (sädelatva) on suosittu koristekasvi. Terälehtien värit ovat peräisin vesiliukoisistaantosyaaneista, jotka ovat sekundäärimetabolian tuotteita. Tutkiessamme tätä metaboliareittiä, löysimmesen läheltä haaran, joka johtaa karvaan makuisiin yhdisteisiin, gerberiiniin ja parasorbosidiin.Näiden karvasaineiden merkitys gerberalle on ollut tuntematon.Gerberan karvasaineiden biosynteesiin vaikutettiin geenitekniikan keinoin hiljentämällä keskeisen2PS-geenin toiminta. Anti-2PS-linjojen siirtogeenisiin gerberoihin ei gerberiiniä ja parasorbosidiasynny, vaan ne maistuvat tavanomaiseen gerberaan verrattuna makealta. Epäily näiden makealta maistuvienkasvien herkkyydestä hyönteisherbivoriaan heräsi kasvihuonehavaintojemme perusteella.Teimme erilaisia syöttö- ja munintakokeita, joissa hyönteiset saivat valita karvasaineettoman jakarvasainetta sisältävän gerberan välillä. Karvasaineilla oli voimakas estävä vaikutus täplätupsukkaan(Orgyia antiqua) ja krysanteemiyökkösen (Spodoptera littoralis) herbivoriaa vastaan. Ansarijauhiasen(Trialeurodes vaporariorum) toukille karvasaineilla ei ollut merkitystä.Tutkimuksemme perusteella karvasaineilla on hyönteisherbivoriaa ehkäisevä vaikutus. Eri lajikkeillaon vaihtelua karvasaineiden määrän suhteen ja yhdisteiden pitoisuuksien mittaaminen onyksinkertainen keino uusien lajikkeiden hyönteiskestävyyden arvioimiseen jalostustyössä. Pitkällätähtäyksellä on myös mahdollista molekyylibiologisin keinoin siirtää koko karvasainereitti uusiinhyötykasvilajeihin, käytännössä koristekasveihin.
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7

Xu, Xiaodan, Wei Zheng, Vicki A. Funk, Kexin Li, Jie Zhang, and Jun Wen. "Home at last III: Transferring Uechtritzia and Asian Gerbera species into Oreoseris (Compositae, Mutisieae)." PhytoKeys 96 (March 8, 2018): 1–19. http://dx.doi.org/10.3897/phytokeys.96.23142.

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Recently the Asian Gerbera species were shown to form a clade that was not the sister group of the African Gerbera. In this study, the position of the Asian Gerbera species was further assessed based on morphology and molecular phylogenetic analyses that included six Asian Gerbera and 26 other species from the Gerbera-complex. Morphological results showed that the six Asian Gerbera species, which were sampled, bear leaves with the adaxial epidermal surface lacking stomates, possess bracteate scapes and lack inner ray florets. These characters suggest that the Asian Gerbera species are most closely related to the species of Uechtritzia, which also share similar pollen grain size and shape with the Asian Gerbera, rather than to the African Gerbera. Furthermore, the phylogenetic results based on two nuclear (ITS and ETS) and three chloroplast (trnL–trnF, trnL–rpl32 and trnC–petN) sequences strongly support the Asian Gerbera and Uechtritzia forming a clade, with the latter nested within the Asian Gerbera species. Both morphological and molecular phylogenetic data thus confirmed the taxonomic identity of the Asian Gerbera and Uechtritzia. The authors herein formally treat the nine species of the Asian Gerbera and the three species of Uechtritzia as members of the genus Oreoseris, which is the earliest generic name of this lineage and has the nomenclatural priority.
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8

Combrink, Nic JJ. "Calcium improves gerbera (Gerbera hybrida) vase life." South African Journal of Plant and Soil 35, no. 3 (November 23, 2017): 235–36. http://dx.doi.org/10.1080/02571862.2017.1354089.

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9

Gong, Li, and Zhanao Deng. "EST-SSR markers for gerbera (Gerbera hybrida)." Molecular Breeding 26, no. 1 (January 13, 2010): 125–32. http://dx.doi.org/10.1007/s11032-009-9380-x.

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10

Cardoso, Jean C., and Jaime A. Teixeira da Silva. "Gerbera micropropagation." Biotechnology Advances 31, no. 8 (December 2013): 1344–57. http://dx.doi.org/10.1016/j.biotechadv.2013.05.008.

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11

Shlahi, Sattar Abdullah, Duha Mysire Majeed, and Salah Mohammed Hasan. "In vitro propagation of Gerbera (Gerbera jamesonii Bolus)." Journal of Biotechnology Research Center 7, no. 1 (January 1, 2013): 50–58. http://dx.doi.org/10.24126/jobrc.2013.7.1.245.

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Gerbera plant Gerbera jamesonii is classified according to the flower colors to four strains: white, yellow, pink and purple. Capitulum and scape explants were tested on MS medium in half or full salts strength, supplemented with different combinations of plant growth regulators cytokinins kintin (Kin) and benzel adinine (BA), auxin indolacitic acid (IAA). Results revealed that the capitulum showed better response to shoot formation 64.13% whereas the scape did not show response. Yellow flowers showed higher response in shoot formation 37.5% than other strains. growth regulators combination BA and IAA (3.0 + 0.1) mg/L respectively showed better response for shoot multiplication. Auxin IBA (0.5) mg/ L gave better rooting percentage 60% than other auxins IAA and NAA all concentrations. The acclimatization of the gerbera was 78.59%.
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12

Ghimiray, T. S., and I. Sarkar. "Studies on Genetic Variability in Gerbera (Gerbera jamesonii)." International Journal of Bioresource Science 2, no. 2 (2015): 81. http://dx.doi.org/10.5958/2454-9541.2015.00002.x.

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13

Spiers, James D., Fred T. Davies, Chuanjiu He, Terri W. Starman, Scott A. Finlayson, Scott A. Senseman, and Kevin M. Heinz. "Fertilization Affects Constitutive and Wound-Induced Chemical Defenses in Gerbera jamesonii." Journal of Environmental Horticulture 29, no. 4 (December 1, 2011): 180–84. http://dx.doi.org/10.24266/0738-2898-29.4.180.

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Abstract The total phenolic content and jasmonic acid (JA) content of foliage from gerbera (Gerbera jamesonii ‘Festival Salmon’) subjected to low and high fertilization rates were measured to determine effects of fertilization on phytochemicals implicated in defense of insect pests. Gerbera seedlings were fertilized with low (only supplied with initial fertilizer charge present in professional growing media) or high (200 mg·liter−1 N; recommended rate) fertilization rates. Since JA is induced in response to wounding, treatments consisted of ± mechanical wounding with a hemostat to one physiologically mature leaf and the subsequent harvest of that leaf at specified time intervals (0, 0.5, 1, 3, and 10 h) for JA quantification. Total phenolic content was measured in mature and newly formed leaves. Plants receiving low fertility had reduced aboveground dry mass, were deficient in nitrogen and phosphorous, and had approximately a 9-fold higher concentration of total phenolics in mature leaf tissue compared to high fertility plants. Newly formed leaves had greater concentrations of phenolics than mature leaves in low fertility plants. In response to wounding, JA accumulation was more rapid and higher concentrations of JA were sustained longer in low fertility plants than in high fertility plants. These results show that altering fertilization does affect phytochemicals implicated in defense against insect pests, and these chemical defenses are increased in the foliage of low fertility gerberas.
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14

Abraham, C. M., S. K. Braman, R. D. Oetting, and P. A. Thomas. "Nonpreference Among Gerbera Cultivars by the Leafminer Liriomyza trifolii (Agromyzidae: Diptera)." Journal of Environmental Horticulture 31, no. 3 (September 1, 2013): 183–88. http://dx.doi.org/10.24266/0738-2898.31.3.183.

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The leafminer, Liriomyza trifolii (Burgess) is a key pest of gerbera daisies (Gerbera jamesonii Bolus), which are among the most preferred cut flowers in the world. While insecticides often fail to control this pest, parasitoids have proven to be effective. To maintain the parasitoids in the system, pesticide applications should be avoided. However, the influx of secondary pests like mites, thrips, whiteflies, and aphids during the growing season necessitates chemical sprays, which are effective in controlling the secondary pests, but are often toxic to the natural enemy and hence disrupt biological control. Since chemicals are not easily avoided in this system, an alternative method to avoid leafminers was sought, using host plant resistance, which can be an important component of integrated pest management (IPM) programs. Sixty gerbera cultivars were evaluated for potential resistance to L. trifolii. A range in susceptibility measured as leaf punctures and developing mines was evident for the first five weeks of a six-week exposure period. Gerberas ‘Jaguar Pink’, ‘Jaguar Rose Deep’, ‘Jaguar Salmon Pastel’, and ‘Revolution Spring Pastel’ were the least damaged, exhibiting less than 20% of the highest damage on at least two observation dates. However, consistent exposure to high numbers of leafminers resulted in similar expression of damage among all cultivars after five weeks. Differences among cultivars in force required to puncture leaves could not be consistently associated with damage due to leafminers
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15

Kloos, Wesley E., Carol G. George, and Laurie K. Sorge. "Dark Disk Color in the Flower of Gerbera hybrida is Determined by a Dominant Gene, Dc." HortScience 40, no. 7 (December 2005): 1992–94. http://dx.doi.org/10.21273/hortsci.40.7.1992.

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The cultivated gerbera daisy [Gerbera hybrida (G. jamesonii Bolus ex Adlam × G. viridifolia Schultz-Bip)] produces flowers that have either a dark (shades of dark brown, brown-black, black-purple, or black) or light (shades of green-yellow, yellow-green, or light yellow) central disk. The dark-centered varieties have increased in popularity over the past 20 years and provided an exciting color contrast, especially in white, yellow, and various pastel-colored flowers. The objective of this investigation was to determine the mode of inheritance of disk color in gerberas. A series of crosses were made to produce PA, PB, F1, F2, BC1A, and BC1B progeny to complete the Mendelian genetic analysis. Phenotypic segregation ratios indicated that dark disk color was determined by a single dominant gene, designated Dc, and the light disk color by a recessive gene, dc. Dominance appeared to be complete in that the disk color was similar in both homozygous and heterozygous Dc plants.
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16

Nagrale, Dipak T., Anil P. Gaikwad, Sanjay Goswami, and Lalan Sharma. "Fungicidal management of Alternaria alternata (Fr.) Keissler causing blight of gerbera (Gerbera jamesonii H. Bolus ex J.D. Hook)." Journal of Applied and Natural Science 4, no. 2 (December 1, 2012): 220–27. http://dx.doi.org/10.31018/jans.v4i2.253.

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Alternaria, the fungal pathogen has wide host range generally attacks the aerial parts of plants causing leaf spots and blights. Gerbera is a genus of ornamental flower plants. Gerbera plants are infected by many diseases. Different disease management practices are adopted in gerbera cultivation. The fungicidal management of Alternaria blight is one of the important strategies for the disease management in gerbera in polyhouse condition. In this study, preventive and curative fungicidal sprays were adopted for the management of blight disease in polyhouse. This study revealed that preventive fungicidal sprays were significant over curative fungicidal sprays for the management of Alternaria alternata blight of gerbera (Gerbera jamesonii H. Bolus ex J.D. Hook) in polyhouse. The preventive sprays made of Bordeaux mixture (0.6 %), tricyclazole (0.1%) and iprodione + carbendazim (0.1%) fungicides were found effective with 95.85 %, 96.59 % and 95.88 % disease control respectively, under polyhouse condition.
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17

Truszkowska, W., and M. Osmelakowa. "Some pathogenic fungi responsible for the dying of Gerbera jamesonii Bolus." Acta Mycologica 8, no. 1 (November 21, 2014): 59–66. http://dx.doi.org/10.5586/am.1972.007.

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The object of our studies were plants of <i>Gerbera jamesonii</i> Bolus wilting away in a greenhouse of the Botanical Garden in Wrocław. The investigations show that the plants had been destroyed mostly due to a disease caused by <i>Fusarium oxysporum</i> Schl. f. sp. <i>gerbarae</i> Gordon.
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18

Vijayalakshmi, C. L., P. Babu, A. N. Bagali, C. D. Soregaon, and Ashwini H. Wadageri. "Direct in vitro Regeneration of Gerbera (Gerbera jamesonii Bolus)." International Journal of Current Microbiology and Applied Sciences 8, no. 01 (January 10, 2019): 2610–19. http://dx.doi.org/10.20546/ijcmas.2019.801.274.

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19

Manning, J. C., B. Simka, J. S. Boatwright, and A. R. Magee. "A revised taxonomy of Gerbera sect. Gerbera (Asteraceae: Mutisieae)." South African Journal of Botany 104 (May 2016): 142–57. http://dx.doi.org/10.1016/j.sajb.2015.10.002.

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20

Gautam, K. K., S. Kumar, and S. K. Raj. "Current Status of Viral and Phytoplasma Diseases Affecting Gerbera Cultivation and Their Management." Acta Phytopathologica et Entomologica Hungarica 55, no. 2 (March 16, 2021): 133–50. http://dx.doi.org/10.1556/038.55.2020.019.

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Gerbera (Gerbera jamesonii) is a popular ornamental plant cultivated all over the world. It is grown in beds, pots and used as cut-flower in making bouquets and for decoration in ceremonial functions. Gerbera has been commercially cultivated by a large number of growers in India as a primary source of income, therefore, has high socioeconomic impact in floriculture industry. The gerbera cultivation areas in India are increasing day by day due to its uses and the market demands. Its cultivation has been hampered by a variety of diseases that affect its flower quality and quantity. Of them, the viral and phytoplasma diseases cause considerable losses in gerbera cultivation. In this review, we have described about the disease symptoms, detection methods and identification of causal virus and phytoplasma pathogens affecting gerbera production worldwide and their disease management strategies opted by the researchers for production of pathogen-free plants.
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21

TSUJITA, M. J., and R. G. DUTTON. "ROOT-ZONE TEMPERATURE EFFECTS ON PEAT-BAG-CULTURED GERBERAS." Canadian Journal of Plant Science 67, no. 2 (April 1, 1987): 585–87. http://dx.doi.org/10.4141/cjps87-081.

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Three cultivars of Gerbera jamesonii H. Bolus ex Hook. f. planted in peat bags were grown in greenhouses at 16 °C/12.5 °C/12.5 °C or 16 °C/12.5 °C/22 °C day/night/root-zone temperatures. The yield and stem length of the three gerbera cultivars were substantially enhanced by root-zone heating (16 °C/12.5 °C/22 °C). Placing peat bags on heated soil was effective in maintaining the root-zone temperature for Gerbera production.Key words: Gerbera jamesonii, greenhouse production
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22

Đình Thục, Đỗ. "ĐÁNH GIÁ KHẢ NĂNG SINH TRƯỞNG VÀ PHÁT TRIỂN CỦA MỘT SỐ GIỐNG HOA ĐỒNG TIỀN LÙN TẠI THÀNH PHỐ HUẾ, TỈNH THỪA THIÊN HUẾ." Tạp chí Khoa học và công nghệ nông nghiệp, Trường Đại học Nông Lâm Huế 5, no. 1 (April 28, 2021): 2217–26. http://dx.doi.org/10.46826/huaf-jasat.v5n1y2021.426.

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Thí nghiệm thực hiện trong vụ Đông Xuân năm 2020 tại thành phố Huế, tỉnh Thừa Thiên Huế nhằm mục đích tìm hiểu đặc điểm sinh trưởng, phát triển của 6 giống hoa đồng tiền lùn (ĐT) trồng chậu gồm có 305 (màu hồng), ĐT 308 (màu vàng), ĐT 315 (màu trắng), ĐT 320 (màu đỏ thẫm), ĐT 326 (màu đỏ đô), giống đối chứng (màu đỏ tươi) đã được trồng thử nghiệm tại tỉnh Thừa Thiên Huế trong 2 năm và xác định được giống hoa đồng tiền lùn phù hợp với điều kiện sinh thái tỉnh Thừa Thiên Huế. Kết quả nghiên cứu cho thấy các giống tham gia thí nghiệm có thời gian sinh trưởng phù hợp với điều kiện địa phương (73 - 93 ngày). Các giống hoa đồng tiền lùn thí nghiệm đều có số hoa trên cây dao động từ 1,3 - 1,9 hoa, đường kính hoa đạt yêu cầu thẩm mĩ, độ bền hoa dài, màu sắc hoa đẹp phù hợp với thị hiếu người tiêu dùng trên địa bàn thành phố Huế. Trong đó có 3 giống là ĐT 308 (màu vàng), ĐT 320 (màu đỏ thẫm) và ĐT 305 (màu hồng) có các chỉ tiêu sinh trưởng phát triển tốt hơn so với các giống khác và giống đối chứng. ABSTRACT The experiment was carried out in the Winter-Spring crop of 2020 in Hue city, Thua Thien Hue province with the aim of understanding the growth and development characteristics of 06 potted gerbera varieties including gerbera variety 305 (pink), gerbera variety 308 (yellow), gerbera variety 315 (white), gerbera variety 320 (dark red), gerbera variety 326 (brown red), control gerbera variety (fresh red) and identifying the dwarf gerbera variety suitable for the ecological condition of Thua Thien Hue province. The results of the study showed that the varieties in the experiment had suitable duration for local conditions (73 - 93 days). The experimental dwarf gerbera varieties had the number of flowers per plant ranging from 1.3 to 1.9 flowers, the flower diameter met the aesthetic requirements, long flower durability, beautiful flower color, and general all varieties are suitable for human interests and consumption in Hue city. 3 varieties including gerbera variety 308 (yellow), gerbera variety 320 (dark red), and gerbera variety 305 (pink) had better growth and development performances than other varieties and control variety.
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23

Alikhani, Tahereh Tofighi, Seyed Jalal Tabatabaei, Ali Mohammadi Torkashvand, and Daryush Talei. "Silica nanoparticles and calcium on the histological characteristics and stem bending in gerbera cut flower." Ornamental Horticulture 27, no. 3 (September 2021): 334–43. http://dx.doi.org/10.1590/2447-536x.v27i3.2308.

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Abstract Silica nanoparticles and calcium are necessary for improving plant yield and decreasing stem bending in gerbera flower (Gerbera Jamesonii L.). In order to determine the optimal concentrations of silica nanoparticles and calcium in gerberas (Gerbera Jamesonii L.), a factorial experiment in the form of completely randomized design with two factors was conducted. The first factor was the concentration of silica nanoparticles (Nanoparticle-SiO2) at four rates (0, 20, 40, and 80 mg L-1) and the second factor was the concentration of calcium chelate (Ca-Chelate) at four rates (0, 60, 120, and 240 mg L-1) which were applied as nutrient solutions. After harvest, characteristics such as stem bending, cellulose content, phenyl alanine ammonia-lyase enzyme activity in leaves, and stem histological characteristics were measured. Results indicated that the lowest stem bending (deviation angle of 8.78°) was observed with applying 20 mg L-1 Nanoparticle-SiO2 and 240 mg L-1 Ca-Chelate. Comparing with control, applying 80 mg L-1 Nanoparticle-SiO2 and 240 mg L-1 Ca-Chelate increased lignin and cellulose contents by 33 and 15%, respectively. The highest amount of phenylalanine ammonia-lyase (2.87 units per mg of fresh leaf) was obtained by using 60 mg L-1 calcium chelate. According to nutrient concentrations, the change patterns of xylem and stem lignification were different, which is in line with the results of the physiological studies conducted on the effects of applying silica nanoparticle and calcium in nutrient solution. Under the epidermis, there was a hypodermis (sclerenchyma) which strengthens stem tissue. Silica nanoparticles and calcium chelate due to increasing phenylalanine ammonia-lyase content and its effect on the production cycles of cellulose and lignin and increasing stem sclerenchyma, led to stems strength and lignification, which eventually decreased stem bending. According to study results, applying 40 mg L-1 Nanoparticle-SiO2 and 60 mg L-1 Ca-Chelate in hydroponic nutrient solution is recommended for growing gerbera flowers.
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24

Yeasmin, Fatema, and Shamim Shamsi. "Phylloplane mycoflora of Gerbera spp. and their Pathogenic potentiality." Journal of Bangladesh Academy of Sciences 37, no. 2 (January 5, 2014): 211–17. http://dx.doi.org/10.3329/jbas.v37i2.17562.

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Two types of symptoms, blight and anthracnose, were recorded on two species of Gerbera viz. Gerbera aurantiaca L. and Gerbera viridifolia L. The most common fungal species isolated from Gerbera spp. were Alternaria citrii, A. tennuisssima, Aspergillus flavus, A. fumigatus, A. niger, A. terreus, Bipolaris hawaiiensis, Chaetomella raphigera, Cladosporium cladosporoides, Colletotrichum capsici, C. coffeanum, C. dematium, C. gleosporioides, C. lindemuthianum, C. musae, C. orbiculare, Colletorichum sp.1, Colletotrichum sp.2, Colletotrichum sp.3, Colletotrichum sp.4, Curvularia clavata, C. lunata, Fusarium nivale, F. semitectum, Phomopsis sp., Penicillium sp., Pestalotia sp., Rhizopus stolonifer, Trichoderma viride, one cleistothecial ascomycetes and one sterile fungus. The frequency percentage of association of Colletotrichum spp. with Gerbera spp. was higher than any other fungi. Bipolaris hawaiiensis is a new record for Bangladesh. Among the isolated fungi Alternaria citrii, A. tennuissima, Colletotrichum capcisi, C. dematium, C. coffeanum and Curvularia clavata were found to be pathogenic to Gerbera plant. DOI: http://dx.doi.org/10.3329/jbas.v37i2.17562 Journal of Bangladesh Academy of Sciences, Vol. 37, No. 2, 211-217, 2013
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Sil, Manaswita, Madhumita Mitra Sarkar, B. Raghupathi, and Sourav Mondal. "Varietal Evaluation of Gerbera (Gerbera jamesonii) Grown in a Polyhouse." International Journal of Current Microbiology and Applied Sciences 6, no. 7 (July 10, 2017): 810–14. http://dx.doi.org/10.20546/ijcmas.2017.607.099.

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Rivera-Colín, Azucena, Jaime Mejía-Carranza, Luis M. Vázquez-García, Elizabeth Urbina-Sánchez, and Marithza G. Ramírez-Gerardo. "APTITUD COMBINATORIA Y HETEROSIS EN VARIEDADES DE GERBERA (Gerbera × hybrida)." Revista Fitotecnia Mexicana 42, no. 2 (June 10, 2019): 155–62. http://dx.doi.org/10.35196/rfm.2019.2.155-162.

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Los cultivos que cuentan con un número considerable de variedades cultivadas, como la gerbera (Gerbera × hybrida), pueden ser evaluados mediante experimentos de cruzas dialélicas para la formación de nuevos híbridos. El objetivo de la presente investigación fue estimar la aptitud combinatoria general (ACG) de seis variedades de gerbera y la aptitud combinatoria específica (ACE) de sus cruzas dialélicas, así como la heterosis en componentes de rendimiento y calidad de flores. Se empleó el método 1 de progenitores y sus cruzas F1 directas y recíprocas con el modelo II de efectos aleatorios de Griffing. La evaluación se realizó bajo un diseño experimental de bloques completos al azar con cuatro repeticiones. El análisis estadístico detectó diferencias significativas (P ≤ 0.01) dentro y entre progenitores y cruzas, así como en las interacciones, lo que evidenció amplia variabilidad entre progenitores y efectos maternos significativos por herencia citoplásmica. Los mayores efectos de ACG (P ≤ 0.01) para rendimiento de tallos florales lo tuvieron los progenitores IGL, MG2 y FAS, mientras que los mayores efectos de ACE los mostraron las cruzas FAS × JES, ALC × IGL y DIN × IGL. Se encontraron efectos positivos de heterosis para rendimiento en las cruzas FAS × IGL, JES × IGL, ALC × IGL, DIN × IGL, MG2 × IGL y FAS × MG2. Los resultados sugieren que Igloo y Fascination pueden ser utilizados como progenitores superiores en programas de cruzamiento para desarrollo de nuevas variedades de gerbera. Los valores altamente significativos de ACG para rendimiento de flor indican la importancia relativa de la acción génica aditiva sobre los efectos no aditivos.
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YAZICI, Kübra. "Erbaa (Tokat) Ekolojik Koşullarında Bazı Gerbera (Gerbera sp.) Çeşitlerinde GA3." Journal of Agricultural Faculty of Gaziosmanpasa University 36, no. 2019-1 (January 1, 2019): 45–54. http://dx.doi.org/10.13002/jafag4573.

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Kloos, Wesley E., Carol G. George, and Laurie K. Sorge. "Inheritance of the Flower Types of Gerbera hybrida." Journal of the American Society for Horticultural Science 129, no. 6 (November 2004): 802–10. http://dx.doi.org/10.21273/jashs.129.6.0802.

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Cultivated gerbera daisies [Gerbera hybrida (G. jamesonii Bolus ex Adlam × G. viridifolia Schultz-Bip)] have several different flower types. They include single and crested cultivars that have normal florets with elliptical (ligulate) outer corolla lips and spider cultivars that have florets with laciniated (split) outer corolla lips appearing as several pointed lobes. The objective of this investigation was to determine the mode of inheritance of the major flower types of gerberas in the North Carolina State Univ. collection. The collection contained parents and four generations of progeny representing a wide range of single and crested cultivars and some spider cultivars. Genotypes of parents used in crosses were determined by testcrosses to single-flowered, ligulate floret cultivars similar in phenotype to the wild, parental gerbera species. Testcrosses indicated that the wild type was recessive to the crested and spider flower types and given the genotype crcrspsp. For each of the types, a series of crosses were made to produce PA, PB, F1, F2, BC1A, and BC1B progeny. Allelism was tested operationally by crossing genotypes in all possible combinations and observing single-gene-pair ratios. Linkage relationships among the crested and spider loci were tested using dihybrid crosses and testcrosses. Phenotypic segregation ratios suggested the presence of two dominant alleles, Crd and Cr, determining the enlarged disk and trans floret, male-sterile and enlarged trans floret, male-fertile crested types, respectively, and an unlinked dominant gene, Sp, determining the spider type. Dominance appeared to be incomplete due to the reduction of trans floret length in most Crdcr and Crcr heterozygotes compared to crested homozygotes and the appearance of the quasi-spider type (spider trans and disk florets and ligulate and/or slightly notched ray florets) among certain crested Spsp heterozygotes.
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Mantovani, José Ricardo, Luana Gouveia da Silveira, Paulo Roberto Corrêa Landgraf, Anderson Romão dos Santos, and Belchior De Souza Costa. "Doses de fósforo e uso de esterco bovino no cultivo de gérbera de vaso." Ornamental Horticulture 23, no. 4 (December 8, 2017): 412–18. http://dx.doi.org/10.14295/oh.v23i4.1012.

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Gerbera can be grown as a cut flower or in pots. However, there is little information on nutrition and fertilization, especially related to phosphorus and the use of organic matter in pots. This study aimed to evaluate the growth and production of potted gerbera under doses of phosphorus and the use of cattle manure. The experiment was carried out in pots, under greenhouse conditions. A randomized block experimental design was used in a 5 x 2 factorial scheme with 4 replications, totaling 40 experimental units. The treatments consisted of 5 P rates: 0, 20, 40, 60 and 80 mg dm-3 P, as triple superphosphate powder and use, or not, of cattle manure. Phosphate fertilization and cattle manure in soil with low P contents did not influence the growth and production of potted gerbera. Phosphorus rates improve the nutritional status of potted gerbera, but do not contribute to the commercial quality of the plants. The use of cattle manure increases the availability of phosphorus in the soil for potted gerbera cultivation without, however, contributing to commercial quality. Potted gerbera is poorly responsive to phosphorus addition, supplied by both mineral and organic fertilizers.
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Jamil, Fauzi Awaludin, Angga Adriana Imansyah, and Melissa Syamsiah. "PENGARUH GA3 DAN BAP TERHADAP PERBANYAKAN TUNAS GERBERA JAMENSONII SECARA IN VITRO." Pro-STek 3, no. 1 (July 6, 2021): 1. http://dx.doi.org/10.35194/prs.v3i1.1461.

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Tanaman Gerbera (Gerbera Jamensonii) merupakan tanaman hias yang diminati serta memiliki permintaan yang tinggi. Teknologi kultur jaringan merupakan teknologi yang tepat untuk memperoleh hasil percepatan benih yang berkualitas dengan penambahan ZPT (Zat Pengatur Tumbuh). ZPT yang digunakan adalah kombinasi GA (Asam Giberelat) dan BAP (Benzyl Amino Purine). Penelitian ini dilaksanakan pada bulan Juli sampai Agustus 2020, bertempat di Balai Penelitian Tanaman Hias (BALITHI) Segunung. Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi GA (Asam Giberelat) dan BAP (Benzyl Amino Purine) terhadap multiplikasi tanaman Gerbera. Rancangan yang digunakan dalam penelitian ini adalah Rancangan Acak Lengkap (RAL) faktorial yang terdiri dari 4 taraf perlakuan dengan masing masing perlakuan terdapat 3 sampel. Parameter penelitian ini meliputi, jumlah tunas, jumlah daun dan panjang daun. Hasil penelitian menunjukan bahwa pemberian G1S1 (GA 3 ppm dan BAP 0,5 ppm) merupakan perlakuan yang paling baik yang mampu menstimulus jumlah tunas dan jumlah daun Gerbera (Gerbera Jamensonii).
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Carrodeguas-Gonzalez, Ayerin, and Andres Zuñiga Orozco. "Bases para la mejora genética en Gerbera hybrida." Repertorio Científico 23, no. 2 (December 13, 2020): 51–62. http://dx.doi.org/10.22458/rc.v23i2.3000.

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: Gerbera hybrida, conocida popularmente como Margarita de Japón, es una planta ornamental por excelencia que se cultiva en casi todas las regiones del planeta, tanto como planta en maceta, como para ser utilizada como flor de corte. Sus inflorescencias presentan una larga duración poscosecha, siendo muy adecuadas para la confección de arreglos florales. La gerbera moderna es el resultado de la hibridación entre Gerbera jamesonii, Gerbera viridifolia y posiblemente otras especies, por lo que puede ser llamada de diferentes formas tales como: Gerbera jamesonii hybrida, híbridos de Gerbera jamesonii o Gerbera hybrida. Por ser una planta ampliamente cultivada, se han desarrollado en diferentes países diversos programas de mejoramiento genético, pero la mayoría basados en genética clásica sin aplicar el uso de herramientas moleculares. En Cuba, aun no se ha trabajado en el mejoramiento de este cultivo, lo cual sería sumamente importante teniendo en cuenta los problemas que hoy se presentan, como la baja germinación de las semillas. El objetivo de este trabajo es realizar una descripción de la biología floral de esta especie para apoyar el inicio de un programa de mejora. Además, se realizó un estudio de los antecedentes en la mejora genética a nivel internacional, como son: el cariotipado de la especie, estudios de diversidad genética, heredabilidad, mapeo genético, estudio de genes reguladores, y otros aspectos de la biología reproductiva como los modos de reproducción y los sistemas de autoincompatibilidad.
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Jasper, Mônica, Maristella Dalla Pria, and Andressa Andrade e. Silva. "Uso do leite de vaca in natura no controle de oídio na cultura da gérbera." Summa Phytopathologica 35, no. 4 (December 2009): 322–24. http://dx.doi.org/10.1590/s0100-54052009000400011.

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Gerbera (Gerbera jamesonii) is one of the most popular ornamental plants in the world, used as cut or vase flower. The experiment aimed to evaluate the effect of milk in natura to control powdery mildew (Erysiphe cichoracearum) on gerbera. The treatments tested were: two concentrations of cow's milk in natura (8 and 16%), with and without adjuvant (vegetal oil), three fungicides (fenarimol -6 g a.i.100 L-1 H2O, chlorothalonil -150 g a.i.100 L-1 H2O and azoxystrobin + mineral oil - 10 g a.i.100 L-1 H2O) and control treatment. The area under the disease progress curve (AUDPC) was calculated for each plot based on disease severity. Milk in natura applied with adjuvant controlled the disease and did not allow the infection and development of pathogen. The addition of adjuvant improves the efficiency of milk in natura, but it requires subsequent washing of plants with H2O + detergent. The fungicide fenarimol promoted the best control and also the best gerbera visual aspect. The fungicide azoxystrobin + mineral oil and the chlorothalonil were phytotoxic to gerbera plants, affecting the aspect of leaves and flowers.
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Jahan, M. R., B. Shahanaz, M. M. Islam, M. Rakibuzzaman, and A. F. M. Jamal Uddin. "Characterization and petal color analysis of Gerbera cultivars." Journal of Bioscience and Agriculture Research 26, no. 1 (2020): 2143–50. http://dx.doi.org/10.18801/jbar.260120.262.

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Breeders and Researchers need information for selecting and improving gerbera flower as promising cut flowers through flower color analysis. This experiment was accomplished to accurately define the different flower color cultivar and analysis of flower color of gerbera in the Horticulture farm of Sher-e-Bangla Agricultural University during the period of January, 2017 to June, 2017. Fourteen gerbera cultivars were used in this experiment arranged in Randomized Complete Block Design with three replications. The gerbera cultivars have been classified based on peduncle length and diameter, receptacle diameter, ray floret diameter, trans floret diameter, disc diameter, flower head type, disc color, flower shape, flower per plant and floret color following UPOV authorized guidelines. The color of the gerbera cultivars were definitely measured and expressed through L* (lightness), a* and b* (two Cartesian coordinates) including C* and hab (Chroma & Hue angle) based on CIELab scale. Classification and variation in petal color attributes presented in tables and plates that may be used for further research to improve the flower sector.
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Krug, Brian A., Brian E. Whipker, Ingram McCall, and Jonathan Frantz. "Elevated Relative Humidity Increases the Incidence of Distorted Growth and Boron Deficiency in Bedding Plant Plugs." HortScience 48, no. 3 (March 2013): 311–13. http://dx.doi.org/10.21273/hortsci.48.3.311.

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High relative humidity (RH) can cause lower concentrations of boron (B) accumulating in plants. The common greenhouse practice of controlling excess temperatures by applying mist irrigation to young plants (plugs) can result in elevated RH levels, especially with plugs grown in high heat and humidity conditions of summer. ‘Dynamite Yellow’ pansy (Viola ×wittrockiana Gams.), ‘White Storm’ petunia (Petunia ×hybrida Vilm.), and ‘Festival Apricot’ gerbera (Gerbera jamesonii Bolus) plugs were grown in high or ambient RH conditions to determine the effect RH had on B uptake. Results indicate that an increase in RH decreased the amount of water the plant lost as a result of transpiration resulting in lower concentrations of B in shoot tissue. Boron concentrations in leaf tissue were 9.43, 10.56, and 17.81 mg·L−1 in pansy, petunia, and gerbera plants, respectively, grown in high RH conditions. These values were significantly lower than pansy, petunia, and gerbera plants grown in ambient RH conditions (19.94, 25.49, and 42.71 mg·L−1, respectively). Leaf distortion, consistent with B deficiency symptoms, was present in petunia and gerbera plants. Similar trends were observed when the experiment was repeated and leaf distortion was present in all species. This provides convincing evidence that the distorted growth observed in pansy, petunia, and gerbera plug production is the result of limited B caused by excessive humidity.
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Song, Xiaohe, and Zhanao Deng. "Powdery Mildew Resistance in Gerbera: Mode of Inheritance, Quantitative Trait Locus Identification, and Resistance Responses." Journal of the American Society for Horticultural Science 138, no. 6 (November 2013): 470–78. http://dx.doi.org/10.21273/jashs.138.6.470.

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Gerbera (Gerbera hybrida) is an important floricultural crop in the United States and worldwide. Powdery mildew (PM) caused by Podosphaera xanthii is the most common and destructive disease in gerbera production and landscape use. Gerbera breeding line UFGE 31-19 is one of the few sources of resistance to PM in gerbera and has contributed its resistance to new gerbera cultivars. To determine the mode of inheritance for PM resistance in UFGE 31-19, one of its PM-resistant (PM-R) progeny, UFGE 4033, was crossed with PM-susceptible (PM-S) cultivar, Sunburst Snow White, and their progeny were evaluated for PM severity. Distribution of PM severity ratings among the progeny was continuous but with two peaks, suggesting that the PM resistance in UFGE 4033 and UFGE 31-19 is a quantitative trait, likely controlled by major genes. Bulked segregant analysis (BSA) identified 17 molecular markers present in UFGE 4033 and the PM-R bulk but absent in ‘Sunburst Snow White’ and the PM-S bulk. Eleven of the molecular markers were mapped to one genetic linkage group, and two regions on this linkage group together explained 71.1% of the phenotypic (PM severity rating) variance in the segregating population. It was proposed that the two regions be named Rpx1 and Rpx2 (resistance to P. xanthii). Conidia of P. xanthii inoculated on the leaf surface of UFGE 4033 germinated, formed secondary germ tubes, and formed appressoria at high percentages, similar to those on the leaf surface of ‘Sunburst Snow White’. However, P. xanthii hyphae branched significantly less, were significantly shorter, and produced substantially fewer conidia on the leaf surface of UFGE 4033 and its PM-R progeny than on the leaf surface of ‘Sunburst Snow White’. These results should provide a sound foundation for use of UFGE 31-19 and progeny UFGE 4033 in gerbera disease resistance breeding and facilitate further investigation and understanding of the genetic bases of PM resistance in gerbera.
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Samarina, L., T. Kolomiets, V. Malyarovskaya, S. Gubaz, and N. Platonova. "Effect of Glutamine, Biotin and ADP on Micropropagation and Growth of Chrysanthemum hybridum, Gerbera jamesonii and Cordyline fruticosa In vitro." Plant Tissue Culture and Biotechnology 26, no. 1 (September 27, 2016): 97–104. http://dx.doi.org/10.3329/ptcb.v26i1.29771.

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The effect of glutamine, biotin and adenosine diphosphate (ADP) on growth and cultivars micropropagation of three ornamental species was investigated. The addition of 10 ? 100 mg/l glutamine in culture media significantly increased rate of multiplication in Cordyline fruticosa and 100 mg/l glutamine showed the same effect for Gerbera jamesonii. Addition of glutamine did not show any effect on shoot length, root number and length in all the three species. Addition of 1 ? 3 mg/l biotin increased shoot length of Gerbera jamesonii but inhibited shoot length of Cordyline fruticosa and decreased root length of Chrysanthemum hybridum and Gerbera jamesonii. Addition of 5.0 mg/l ADP significantly increased multiplication rate of Cordyline fruticosa and 1.0 mg/l ADP showed similar effect for Gerbera jamesonii.Plant Tissue Cult. & Biotech. 26(1): 97-104, 2016 (June)
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Lifia, Yoli Okta, and Rika Hariance. "Bauran Pemasaran Bunga Gerbera (Gerbera jamensonii) di Kelompok Tani Boemi Nursery Jawa Barat." Journal of Agribusiness and Community Empowerment 1, no. 1 (September 30, 2018): 38–43. http://dx.doi.org/10.32530/jace.v1i1.26.

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Gerbera (Gerbera jamensonii) merupakan salah satu jenis tanaman hias yang memiliki nilai ekonomis tinggi dan sangat prospektif untuk dikembangkan secara komersial terutama sebagai produk bunga potong. Kelompok tani Boemi Nursery merupakan satu penghasil bunga gerbera potong yang berada di daerah Lembang, Kabupaten Bandung Barat. Salah satu penunjang keberhasilan suatu perusahaan adalah bagaimana perusahaan itu menyalurkan dan memasarkan produk-produknya. Oleh karena itu kegiatan pemasaran merupakan hal penting bagi perusahaan. Penulisan bertujuan untuk menjelaskan kegiatan budidaya bunga gerbera yang dilakukan di Kelompok Tani Boemi Nursery dan mengetahui bauran pemasaran bunga gerbera di Kelompok Tani Boemi Nursery. Penelitian ini dilaksanakan pada 1 April 2016 sampai dengan 4 Juni 2016 bertempat di Kelompok Tani Boemi Nursery. Metode pengumpulan data yang digunakan adalah wanwancara, observasi dan dokumentasi. Kelompok Tani Boemi Nursery melakukan bauran pemasaran terhadap produknya yaitu bunga gerbera dengan berbagai warna seperti merah, kuning, orange dan pink. Bunga dijual per ikat dengan jumlah satu ikat sebanyak 10 tangkai. Harga yang ditawarkan untuk pemasaran tidak langsung sebesar Rp 6.500,00 per ikat sedangkan untuk pemasaran secara langsung sebesar Rp 7.500,00 per ikat. Promosi yang dilakukan dalam memasarkan produknya yaitu open house, promosi dari mulut ke mulut, mengikuti seminar dan media sosial. Kelompok tani Boemi Nursery harus membuat manajemen usaha tanaman hias ini lebih baik lagi dengan melakukan pencatatan untuk semua kegiatan yang dilakukan dan pembukuan keuangan dari usaha kelompok tani tersebut. Sehingga usaha yang dijalankan terencana dan terkoordinir dan dapat berjalan sesuai yang diharapkan
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Vazquez, G. L., M. J. Aquino, M. T. Norman, F. A. Martinez, R. V. Sandoval, R. M. C. Corona, and D. L. Strider. "First Report of White Rust of Gerbera Caused by Albugo tragopogonis in North America." Plant Disease 81, no. 2 (February 1997): 228. http://dx.doi.org/10.1094/pdis.1997.81.2.228a.

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In October, 1995, in Villa Guerrero, Mexico, white erumpent sori were detected on the undersurfaces of leaves of a bed of African daisy (Gerbera jamesonii H. Bolus ex J. D. Hook.). The white sori on the undersurfaces of leaves corresponded to chlorotic spots on the upper leaf surfaces. All gerbera plants examined were severely diseased. The gerbera planting was adjacent to a planting of chrysanthemums with symptoms of white rust caused by Puccinia horiana Henn. Symptoms on the leaves of the two crops looked similar, and therefore P. horiana was suspected of causing both diseases. However, when subepidermal sori (pustules) on Gerbera plants were examined microscopically, erumpent chains of round to cylindrical, hyaline to pale yellow sporangiospores borne on short club-shaped sporangiophores were found. The sporangiospores are typical of Albugo tragopogonis (Pers.) S. F. Gray, and it was concluded that the white rust found on gerbera in Villa Guerrero, Mexico, was caused by A. tragopogonis. This disease was reported on gerbera from Australia and New Zealand in 1965 (1) and from Spain in 1977 (2). Other hosts of A. tragopogonis include members in the genera Pericallis (cineraria), Centaurea (dusty miller, basket flower, cornflower, bachelor's-buttons), Ambrosia (common ragweed), Tragopogon (salsify), Antennaria (everlasting, pussytoes), Artemisia (wormwort, mugwort), Cirsium (thistle), Matricaria (false chamomile, pineapple weed), Iva (marshelder), Parthenium (guayule, American feverfew), and Xanthium (common cocklebur, spiny cocklebur). This is the first report of white rust of gerbera caused by A. tragopogonis in North America, and may represent a new disease problem for species of important floral crops in the future. References: (1) R. F. Doepel. J. Agric. West. Aust. Ser. 4 6:439, 1965. [Rev. Appl. Mycol. 45:80, 1966] (2) H. P. Plate and H. Kruber. Nachrichtenbl. Dtsch. Pflanzen-schutzdienst (Berlin) 29(11):169, 1977. [Rev. Plant Pathol. 57:204, 1978]
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Marys, E., A. Mejías, E. Rodríguez-Román, D. Avilán, T. Hurtado, A. Fernández, K. Zambrano, M. Garrido, and M. Brito. "The First Report of Tomato spotted wilt virus on Gerbera and Chrysanthemun in Venezuela." Plant Disease 98, no. 8 (August 2014): 1161. http://dx.doi.org/10.1094/pdis-01-14-0007-pdn.

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Gerbera (Gerbera jamesonii) and Chrysanthemum (family Asteraceae) are two of the top 10 cut flowers of the world, with great commercial value. Since 1998, Venezuela began a floral industry to produce and export fresh cut gerbera and chrysanthemum, with 40% of nurseries concentrated in Altos Mirandinos (Miranda State, north central region of the country). For the past 2 years, greenhouse-grown gerbera and chrysanthemum have been observed displaying symptoms resembling those associated with tospoviruses. Symptomatic plants showed concentric rings, irregular chlorotic blotches, and deformation on leaves. Disease incidence was estimated at 30%. Mechanical inoculation with extracts of symptomatic leaves reproduced the typical concentric ring symptoms on indicator plants Arachis hypogaea L. cv. San Martín, Capsicum chinense, and G. jamesonii 6 to 15 days after inoculation. In initial tests, leaves from each 30 symptomatic gerbera and chrysanthemum species from several greenhouse facilities in Altos Mirandinos reacted positively when tested by DAS-ELISA with polyclonal antisera (ATCC, Rockville, MD) raised against Tomato spotted wilt virus (TSWV). Total RNA was extracted with the RNeasy Plant Mini kit (QIAGEN, Hilden, Germany) from two gerbera and two chrysanthemum ELISA-positive samples. The TSWV coat protein gene was amplified by conventional reverse transcription (RT)-PCR using primers CP1 TSWV (TTAACTTACAGCTGCTTT) and CP2 TSWV (CAAAGCATATAAGAACTT) (1). A single DNA product of ~823 bp was amplified from all samples. RT-PCR products were directly sequenced in both orientations and sequences were deposited in GenBank (Accession Nos. KF146700 and KF146701 derived from chrysanthemum, KF146702 and KF146703 derived from gerbera). The resulting sequences showed over 99% identity with each other. and were found to be closely related (over 99%) with TSWV isolates deposited in GenBank originating from different hosts from France (FR693058, FR693055), Montenegro (GU339506, GU339508, GU355940), Italy (HQ830187), New Zealand (KC494501), South Korea (KC261967), and the United States (AY744476). To our knowledge, this is the first confirmed report of TSWV infecting gerbera and chrysanthemum in Venezuela. The relatively widespread occurrence of TSWV in Miranda State underscores the need for systematic surveys to assess its incidence and impact on ornamental crops so that appropriate management tactics can be developed. Reference: (1) R. A. Mumford et al. J. Virol. Methods 57:109, 1996.
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Rahman, Motiur, Bulbul Ahmed, Rafiul Islam, Abul Mandal, and Monzur Hossain. "A Biotechnological Approach for the Production of Red Gerbera (Gerbera Jamesonii Bolus)." Nova Journal of Medical and Biological Sciences 02, no. 01 (June 1, 2013): 1–10. http://dx.doi.org/10.20286/nova-jmbs-020125.

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41

Weerakkody, W. A. P., K. P. S. S. Kumara, S. J. M. V. L. Samarakoon, and R. A. S. Chandrasiri. "MEDIA AND WATER MANAGEMENT FOR IMPROVED VEGETATIVE GROWTH OF GERBERA (GERBERA JAMESONII)." Acta Horticulturae, no. 1004 (August 2013): 129–33. http://dx.doi.org/10.17660/actahortic.2013.1004.14.

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42

Ghani, Minerva, and Surinder Kumar Sharma. "Induction of powdery mildew resistance in gerbera (Gerbera jamesonii) through gamma irradiation." Physiology and Molecular Biology of Plants 25, no. 1 (October 27, 2018): 159–66. http://dx.doi.org/10.1007/s12298-018-0613-5.

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43

Tsirogiannis, Ioannis, Nikolaos Katsoulas, and Constantinos Kittas. "Effect of Irrigation Scheduling on Gerbera Flower Yield and Quality." HortScience 45, no. 2 (February 2010): 265–70. http://dx.doi.org/10.21273/hortsci.45.2.265.

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Better understanding of the effects of irrigation frequency and dose on flower production of gerbera plants (Gerbera jamesonii) can lead to optimal water management and crop yield. Measurements of greenhouse microclimate and production and quality characteristics of a gerbera crop were carried out under two irrigation frequency regimens in soilless cultivation in a greenhouse located in Arta, Greece. Irrigation scheduling was based on solar radiation and performed whenever accumulated solar radiation energy outside the greenhouse reached 1650 kJ·m−2 [high irrigation frequency (HIF)] or 3300 kJ·m−2 [low irrigation frequency (LIF)]. The amount of water applied was 0.125 mm and 0.250 mm for HIF and LIF, respectively. Stem fresh weight, length and thickness, and number of harvested gerbera flowers were measured along with crop evapotranspiration, crop leaf area, and greenhouse microclimate variables. Measurements started 8 months after transplanting and lasted 90 days (May to July). Leaf area, fresh weight, harvested cut flowers, and the main quality characteristics of gerbera flowers (stem length and flower diameter) were unaffected by the irrigation frequency. In the framework of the experiment, simple formulas for calculation of leaf area index were developed. Finally, a first approach study of an alternative remote sensing irrigation control method using a reflectance index was made and the results are presented.
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44

Lin, W. C., and C. J. French. "Effect of Supplementary Lighting and Soil Warming on Flowering of Three Gerbera Cultivars." HortScience 20, no. 2 (April 1985): 271–73. http://dx.doi.org/10.21273/hortsci.20.2.271.

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Abstract Cut flower Gerbera (Gerbera jamesonii Bolus) plants were grown in pots or ground benches under various photoperiods, levels of irradiance, and soil temperatures. Photoperiodic flowering response varied with the 3 cultivars; ‘Appelbloesem’ was not sensitive to photoperiod; ‘Oranje Nasau’ and ‘Fabiola’ were promoted by short day (SD). In pot-grown Gerbera, SD increased the number of flowers (inflorescences) per plant of ‘Oranje Nassau’ and ‘Fabiola’ in the summer-fall and fall-winter. Supplementary lighting with high-pressure sodium (HPS) lamps increased the fall-winter production of all 3 cultivars. Plants grown under 16 hr photoperiod by extending natural day length with incandescent light (INC) produced the least flowers per plant in both summer-fall and fall-winter. In bench-grown Gerbera, supplementary HPS increased the number of flowers during the fall-winter as compared to natural daylight (ND). Soil warming from 16°−20° to 23°C had no effect on productivity, but increased the peduncle length.
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45

Wang, H., S. Parent, A. Gosselin, and Y. Desjardins. "Vesicular-arbuscular Mycorrhizal Peat-based Substrates Enhance Symbiosis Establishment and Growth of Three Micropropagated Species." Journal of the American Society for Horticultural Science 118, no. 6 (November 1993): 896–901. http://dx.doi.org/10.21273/jashs.118.6.896.

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Micropropagated plantlets of Gerbera jamesonii H. Bolus ex Hook. F. `Terra Mix', Nephrolepis exaltata (L.) Schott `Florida Ruffles', and Syngonium podophyllum Schott `White Butterfly' were inoculated with two vesicular-arbuscular mycorrhizal (VAM) fungi, Glomus intraradices Schenck and Smith and G. vesiculiferum Gerderman and Trappe. They were potted in three peat-based media to determine the effects of mycorrhizal peat substrate on acclimatization and subsequent growth of micropropagated plantlets under greenhouse conditions. Symbiosis was established between the three ornamental species and VAM fungi within 4 to 8 weeks of culture in the greenhouse, but not during acclimatization. Mortality of Gerbera and Nephrolepis mycorrhizal plantlets was reduced at week 8 compared to the noninoculated control. A peat-based substrate low in P and with good aeration improved VAM fungi spread and efficiency. Mycorrhizal substrates had a long-term benefit of increasing leaf and root dry weight of Gerbera and Nephrolepis. Mycorrhizal Gerbera plants flowered significantly faster than non-mycorrhizal plants.
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46

Leonard, Ria T., Amy M. Alexander, and Terril A. Nell. "Postharvest Performance of Selected Colombian Cut Flowers after Three Transport Systems to the United States." HortTechnology 21, no. 4 (August 2011): 435–42. http://dx.doi.org/10.21273/horttech.21.4.435.

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This study examined three transport systems used to transport fresh, non-stored cut flowers from Bogotá, Colombia, to the United States on a monthly basis for 1 year. Five cultivars of cut rose (Rosa hybrida), alstroemeria (Alstroemeria peruviana), carnation (Dianthus caryophyllus), and gerbera (Gerbera jamesonii) were commercially transported using a 7-day conventional distribution system with temperature controls and two rapid transport systems (3-day or 24-hour) with little or no temperature controls, respectively. Temperatures during the 24-hour transport system increased steadily and temperatures were at or above 10 °C for ≈18 h, with half of that time above 15 °C for all shipments. The 3- and 7-day systems had temperature fluctuations ranging from 3 to 24 °C and 3 to 19 °C, respectively. Flowers transported using the rapid transport systems had a significantly longer vase life compared with the 7-day transport in 83% of the shipments of alstroemeria and roses, in 58% of the shipments of carnations, and in 50% of the shipments of gerberas. Vase life increased 5.6% to 17.1% (0.7 to 2.1 days) for roses, 3.2% to 16.7% (0.5 to 2.7 days) for alstroemerias, 12.8% to 34.6% (1.1 to 6.2 days) for gerberas, and 4.6% to 8.8% (1.1 to 2.3 days) for carnations when using the rapid transport systems compared with the 7-day transport system. Some cultivars were more tolerant of the longer transport. The results show that when using fresh, non-stored flowers, the rapid transport systems had equal or longer vase life than the 7-day transport system in the majority of shipments for each flower species. Results also demonstrate that better temperature management during transport is a critical issue in the floral industry that needs to be improved upon.
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47

Kanwar J, K., and S. Kumar. "In vitro propagation of Gerbera: A Review." Horticultural Science 35, No. 1 (February 12, 2008): 35–44. http://dx.doi.org/10.17221/651-hortsci.

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Gerbera has gained popularity in the past few years in many countries of the world and it is in great demand in the floral industry as cut flower as well as potted plant due to its beauty, colour, long vase life, and ability to rehydrate after long transportation. The most commercial cultivars are propagated through vegetative means by multiplication through divisions of clumps; however, the multiplication by this method is too slow to be commercially viable. To commercialize this crop and to meet the growing demand for planting material, tissue and organ culture techniques are being used as alternative methods for propagation in many countries. Most of the work has been carried on plant regeneration by adventitious organogenesis from capitulum, shoot tip, leaf, petiole and other parts of the plant. Attention should be paid to improve the technology to achieve 100% success in all species/cultivars to meet growing demands of the growers globally. From the literature, it is evident that gerberas are highly amenable to in vitro studies, as various explants were found to favourably respond to different culture media with different types and concentrations of growth regulators.
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48

Milani, Marília, Elisandra Maria Pradella, Willian Heintze, Gilmar Schafer, and Renar João Bender. "Nitrogen and calcium fertilization on the growth and development of gerbera cultivated in pots for cut flowers." Ornamental Horticulture 27, no. 3 (September 2021): 288–95. http://dx.doi.org/10.1590/2447-536x.v27i3.2236.

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ABSTRACT Gerbera is a flowering species with relevance to the cut flower market. Understanding nutritional requirements of the species is important to improve fertilization procedures. In the present work, our objective was to evaluate the influence of different doses of nitrogen (N) and calcium (Ca) on the growth and development of gerbera cultivated in pots as a cut flower. The experiment was conducted in a protected environment in a bifactorial design, with an additional treatment consisting of the combination of three N (0.07, 0.15 and 0.2 g L-1 substrate) and Ca (0.02, 0.03 and 0.04 g L-1 substrate) doses applied every 15 days. Control plants were not supplemented with either N or Ca. No significant interaction between N and Ca doses was observed. The highest number of flower stalks was obtained with 0.15 g N L-1 substrate and 0.04 g Ca L-1 substrate. Flower diameter, plant leaf area and total chlorophyll contents were at a maximum of 0.14 g N L-1 substrate and 0.04 g Ca L-1 substrate. N and Ca doses influenced in an independent manner the growth and development of gerberas as a cut flower cultivated in pots, and we determined that its fertilization should occur every 15 days with 0.34 g N L-1 substrate and 0.04 g Ca L-1 substrate.
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49

Uzma, Javeria, Sai Krishna Talla, Ebenezer Madam, and Praveen Mamidala. "Assessment of Salinity Tolerance Deploying Antioxidant Defense Systems in Gerbera Jamesonii." Biosciences Biotechnology Research Asia 19, no. 1 (March 31, 2022): 243–54. http://dx.doi.org/10.13005/bbra/2982.

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Inconsistency in the environment exposes plants to various abiotic stresses. This results in damage of a plant’s cellular components due to excessive accumulation of unstable reactive oxygen. Besides, it also disrupts enzymatic/non-enzymatic detoxification mechanisms in plants making them more sensitive. Salinity is one such abiotic stress which disrupts regular physiological mechanisms in plants. In this study, we examined the effects of salinity using NaCl in four different genotypes of Gerbera jamesonii cv Bolus, an important ornamental plant of family Compositae. We hypothesized that, upon treatment with NaCl (50, 100, 150 200mM concentration), alterations in the morphological features along with elevated levels of H2O2, MDA, proline, and degradation of chlorophyll will be observed. The enzymatic antioxidant defenses were also hypothesized to differ among genotypes based on their level of tolerance. These parameters were monitored on the 5th and 20th day of NaCl treatment and results were recorded. The observations suggest that 1. the Lattara genotype of Gerbera is sensitive to NaCl and 2. Faith is tolerant, while 3. Alcatras and Basic are moderately tolerant. These findings accompanied by further research on the physiological parameters responsible for attaining salinity tolerance may help in developing salt-tolerant varieties in Gerbera. Future studies on decoding molecular networks associated with the antioxidative defense system in Gerbera can help improve breeding and create novel germplasm in various ornamentally important plants besides Gerbera.
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50

SENÉCAL, MICHEL, and BLANCHE DANSEREAU. "INFLUENCE DE LA TEMPÉRATURE NOCTURNE ET D’UN APPOINT DE LUMIÈRE SUR LA CROISSANCE ET LE DÉVELOPPEMENT DU Gerbera ET DU Calendula." Canadian Journal of Plant Science 67, no. 3 (July 1, 1987): 871–79. http://dx.doi.org/10.4141/cjps87-124.

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During fall-winter and spring conditions, Gerbera jamesonii H. Bolus ex Hook. ’Happipot’ and Calendula officinalis L. ’Fiesta Gitanas’ plants were subjected to night temperatures of 9, 13, 17 and 20 °C (1700–0800 h) during the first year of experiment and were grown under supplementary lighting treatments (control, 75 and 150 μmol m−2 s−1) for 7 h per day at a temperature of 13 °C during the second year. The plant top dry weight of gerbera increased with a rise in night temperature and supplementary lighting, but the reverse tendency was noted with calendula under the night temperature treatment; increases in plant top dry weight under supplementary lighting were observed only during the fall-winter period. For both species, root dry weight showed less variation than plant top dry weight under night temperature and supplementary lighting treatments. The percentage of gerbera plants having shoots increased with a reduction of the night temperature and supplementary lighting during the fall-winter experiments. The lowering of night temperature and supplementary lighting reduced calendula flower bud abortion only during the fall-winter period. For both species, flower number was not significantly different among die night temperature treatments. Supplementary lighting enhanced flower number of calendula only. Flowering of gerbera was accelerated with a reduction of night temperature and with supplementary lighting.Key words: Calendula officinalis, Gerbera jamesonii, night temperature, supplementary lighting
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