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Articoli di riviste sul tema "Seedling resistance"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Milus, Eugene A., Kevin D. Lee, and Gina Brown-Guedira. "Characterization of Stripe Rust Resistance in Wheat Lines with Resistance Gene Yr17 and Implications for Evaluating Resistance and Virulence." Phytopathology® 105, no. 8 (2015): 1123–30. http://dx.doi.org/10.1094/phyto-11-14-0304-r.

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Stripe rust, caused by Puccinia striiformis f. sp. tritici, has been the most important foliar wheat disease in south central United States since 2000 when a new strain of the pathogen emerged. The resistance gene Yr17 was used by many breeding programs to develop resistant cultivars. Although Yr17 was classified as a seedling (all-stage) resistance gene conferring a low infection type, seedlings with Yr17 frequently had intermediate to high infection types when inoculated with isolates that caused little or no disease on adult plants of the same wheat lines. The objectives of this study were

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2

Kormanek, Mariusz, Stanisław Małek, and Sylwester Tabor. "Resistance to Pulling Seedlings Out of the Nursery Container." Forests 15, no. 12 (2024): 2157. https://doi.org/10.3390/f15122157.

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An important issue in container nurseries is the production of seedlings of appropriate quality. These seedlings must meet specific biometric parameters and possess traits that ensure their suitability for later use in forest cultivation. One such traitis the ease of pulling the seedling out of the container cell, characterized by the pulling resistance. This resistance depends on many factors, including theseedling parameters, substrate, and container. In this work, a prototype measuring station was used to record seedling pull-out resistance as a function of their vertical displacement. Test

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3

Blaker, N. S., and J. D. Hewitt. "Comparison of Seedling and Mature Plant Resistance to Phytophthora parasitica in Tomato." HortScience 22, no. 1 (1987): 103–5. http://dx.doi.org/10.21273/hortsci.22.1.103.

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Abstract Seedlings of 11 genotypes of tomato (Lycopersicon esculentum, Mill.) were inoculated at the first true leaf stage with zoospores of Phytophthora parasitica under controlled conditions and evaluated for resistance based on seedling death. The same lines also were transplanted into two fields naturally infested with P. parasitica and grown to maturity. Disease severity in the field was evaluated based on plant death and canopy collapse prior to harvest. Resistance to P. parasitica was present in both commercial lines and accessions of L. esculentum var. cerasiforme (Dun.) A. Gray. Seedl

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4

Abdelmalik, Abdelmalik M. "Enhanced Growth and Drought Resistance in Seedlings of Acacia tortilis due to Inoculation of Arbuscular Mycorrhiza Fungi and Bacillus subtilis." International Journal of Agriculture and Biology 26, no. 06 (2021): 750–60. http://dx.doi.org/10.17957/ijab/15.1891.

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A shade house experiment was conducted in Saudi Arabia to evaluate the impact of a mixture of three arbuscular mycorrhiza fungi (AMF) namely Funneliformis mosseae, Rhizophagus intraradices and Claroideoglomus etunicatum, a bacterium Bacillus subtilis, and their combinations on the growth and drought resistance potential of Acacia torilis seedlings under moderate and water deficit-stress. Thus, inoculants treatments (AMF, Bacillus subtilis, AMF+Bacillus, and control) and several watering intervals (1, 2, 3 and 4 weeks) were applied. Inoculation of AMF and Bacillus to A. tortilis seedlings found

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5

Zhao, Wen Ju, Li Rong Wang, Hong Ji, Jian Shu Song, and Yan Wei Fan. "Impacts of Plant Additive on the Seedling Bricks’ Physical Properties." Advanced Materials Research 518-523 (May 2012): 5401–5. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.5401.

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Homemade seedling bricks, which mixed and suppressed with the plant additive, clay, compost, slow-release fertilizer, can create a good living environment for plant growth, guide the development and growth of plant roots, achieve integration of bricks and seedlings to plant, and the seedlings transplant without time limit. We tested the molding density, shatter resistance, seepage rate and other physical properties of seedling bricks without plant additive, adding 5% and 10% of wheat straw, wheat shells and corn leaves, and the results show that adding plant additive can improve the physical p

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6

Lu, Pengxin, and Darren Derbowka. "Effects of seedling age on blister rust resistance assessments in eastern white pine and its hybrid backcrosses." Canadian Journal of Forest Research 42, no. 1 (2012): 67–74. http://dx.doi.org/10.1139/x11-164.

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Seedling age at the time of artificial white pine blister rust ( Cronartium ribicola J.C. Fisch.) inoculation can affect the duration and accuracy of resistance assessments for eastern white pine ( Pinus strobus L.) and its hybrid backcrosses and thereby affect advances in breeding programs intended to enhance genetic resistance to the pathogen. Based on postinoculation seedling mortality rates, up to 5 years were required to rank resistance of eastern white pine genotypes when seedlings were inoculated with C. ribicola at 2 years of age compared with less than 2 years when they were inoculate

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7

Duchesne, Luc C., R. L. Peterson, and Brian E. Ellis. "Interaction between the ectomycorrhizal fungus Paxillus involutus and Pinus resinosa induces resistance to Fusarium oxysporum." Canadian Journal of Botany 66, no. 3 (1988): 558–62. http://dx.doi.org/10.1139/b88-080.

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Inoculation of Pinus resinosa Ait. seedlings with the ectomycorrhizal fungus Paxillus involutus Fr. resulted in a 47% increase in resistance to subsequent infection by the root pathogenic fungus Fusarium oxysporum f.sp. pini as compared with control seedlings. This increase in seedling survival was associated with a sixfold decrease in the sporulation of F. oxysporum in the rhizosphere of seedlings inoculated with Pax. involutus when compared with the rhizosphere of control seedlings. Extraction and bioassay of the seedling rhizosphere and seedling tissues indicated that inoculation with Pax.

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8

da Silva, Poliana Noemia, Vinícius Politi Duarte, Evaristo Mauro de Castro, Bruno Montoani Silva, Josiel de Jesus Santos, and Fabricio José Pereira. "Compaction of Iron Mining Tailings Impairs Seedling Emergence of Schinus terebinthifolia but Vigor Features Show Tolerance During Early Growth." Forests 16, no. 6 (2025): 950. https://doi.org/10.3390/f16060950.

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Soil compaction is a well-known harmful process for germination and seedling growth. Studies about compaction in mining tailings have been neglected despite being essential for the reforestation of impacted areas. This work evaluated the effects of compaction of iron mining tailings on the seedling emergence, early growth, and photosynthesis of Schinus terebinthifolia Raddi, a tolerant species with potential for reforestation. Experiments were implemented in a greenhouse where seeds of S. terebinthifolia were sown in iron mining tailings with four compaction treatments: (1) an uncompacted dry

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9

Bodnaryk, R. P., and R. J. Lamb. "Influence of seed size in canola, Brassica napus L. and mustard, Sinapis alba L., on seedling resistance against flea beetles, Phyllotreta cruciferae (Goeze)." Canadian Journal of Plant Science 71, no. 2 (1991): 397–404. http://dx.doi.org/10.4141/cjps91-055.

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Seedlings of Brassica napus L. 'Westar' or Sinapis alba L. 'Ochre' grown from seeds of various size were offered to flea beetles, Phyllotreta cruciferae (Goeze) in feeding tests for damage assessment. The proportion of cotyledon area damaged in both species was highest for seedlings grown from small seeds in choice and no-choice feeding tests. The proportion of seedlings killed by flea beetle feeding was also highest in seedlings from small seeds, an effect that was especially pronounced at high beetle densities (10/seedling) where 100% of seedlings from small seeds of B. napus were killed com

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10

Admassu-Yimer, Belayneh, Tyler Gordon, Stephen Harrison, et al. "New Sources of Adult Plant and Seedling Resistance to Puccinia coronata f. sp. avenae Identified among Avena sativa Accessions From the National Small Grains Collection." Plant Disease 102, no. 11 (2018): 2180–86. http://dx.doi.org/10.1094/pdis-04-18-0566-re.

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Accessions of cultivated oat (Avena sativa L.) from the United States Department of Agriculture–Agricultural Research Service Small Grains Collection in Aberdeen, ID were characterized for adult plant resistance (APR) and seedling resistance to crown rust, caused by Puccinia coronata f. sp. avenae. Initially, 607 oat accessions with diverse geographic origins were evaluated in field tests in Baton Rouge, LA. Of those, 97 accessions were not fully susceptible and were tested in the field in St. Paul, MN against a diverse P. coronata f. sp. avenae population. Thirty-six accessions that had some

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11

CLOUTIER, Y., L. PELLETIER, and R. MICHAUD. "DEVELOPMENT OF A TEST FOR FREEZING TOLERANCE IN YOUNG ALFALFA SEEDLINGS." Canadian Journal of Plant Science 70, no. 1 (1990): 307–10. http://dx.doi.org/10.4141/cjps90-036.

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An experiment was conducted to study the effects of seedling age on their ability to harden, and to determine whether cultivar × seedling age interaction could be identified for frost resistance. In the present study, 6- to 24-d-old alfalfa (Medicago sativa L.) seedlings were significantly more freezing-tolerant after cold-hardening than unhardened controls. Cold-hardened seedlings of age varying from 8 to 24 d were hardier than 6-d-old seedlings. No cultivar × seedling age interaction was found. The best separation of the cultivars occurred between 18 and 24 d. These findings provide addition

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12

Yücedağ, Cengiz, Nebi Bilir, and Halil Barış Özel. "Phytohormone effect on seedling quality in Hungarian oak." Forest Systems 28, no. 2 (2019): e005. http://dx.doi.org/10.5424/fs/2019282-14604.

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Aim of study: to find out the effects of four phytohormones, including Indole Butyric Acid (IBA), Indole Acetic Acid (IAA), and Gibberellic acids (GA3, GA4) on seedling growth of Hungarian oak which has a natural distribution in the northwestern of Turkey.Area of Study: Mature acorns of Hungarian oak were collected from a natural stand in Zonguldak-Ereğli at northwestern region of Turkey.Material and Methods: Collected acorns of the species were pretreated with 300 ppm of each phytohormone for 24 hours and sown in Yenihan State Forest Nursery of Bartin, Turkey. Two years old bare-root seedling

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13

Putnik-Delic, Marina. "Resistance of some wheat genotypes to Puccinia triticina." Zbornik Matice srpske za prirodne nauke, no. 115 (2008): 51–57. http://dx.doi.org/10.2298/zmspn0815051p.

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Thirty-four wheat genotypes were tested for resistance characteristics to Puccinia triticina at different growth stages. At seedling stage in a greenhouse, latency period, infection frequency and reaction type were determined. In the field, time of spike appearance, and infection intensity were followed. Weak (r = 0.322) to strong (r = 0.660) correlation was found between resistance characteristics at seedling stage (LPxIFxRT, in the greenhouse) and in adult plants (infection intensity and AUDPC, in the field). The values of AUDPC (area under the disease progress curve) were also strongly rela

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14

Kolmer, J. A. "Virulence in Puccinia recondita f. sp. tritici Isolates from Canada to Genes for Adult-Plant Resistance to Wheat Leaf Rust." Plant Disease 81, no. 3 (1997): 267–71. http://dx.doi.org/10.1094/pdis.1997.81.3.267.

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Sixty-seven isolates of Puccinia recondita f. sp. tritici collected in Canada were tested for virulence to adult plants of Thatcher near-isogenic wheat lines with leaf rust resistance genes Lr13, Lr22a, Lr34, Lr35, and Lr13 and Lr34 combined. All of the isolates had low infection type to the Thatcher lines with Lr22a and Lr35. All isolates had lower infection type and lower rust severity on the Thatcher line with Lr34 compared with Thatcher. The isolates were polymorphic for virulence to the Thatcher line with Lr13; many isolates were completely virulent to this line, and other isolates produc

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15

Saleem, Kamran, Mogens Støvring Hovmøller, Rodrigo Labouriau, et al. "Macroscopic and Microscopic Phenotyping Using Diverse Yellow Rust Races Increased the Resolution of Seedling and Adult Plant Resistance in Wheat Breeding Lines." Agronomy 12, no. 5 (2022): 1062. http://dx.doi.org/10.3390/agronomy12051062.

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We characterized yellow rust (YR) resistance in sixteen winter wheat breeding lines using three different pathogen races and macroscopic and microscopic phenotyping in lab and greenhouse. Three rust races were used on seedlings and two races on fifth and flag leaf growth stages. The wheat lines were previously characterized to possess none or different quantitative trait loci for YR resistance in field trials. At the seedling stage, twelve lines showed race-specific seedling resistance whereas four lines gave strong seedling resistance to all three races. Seven of eight lines with QTL.1B showe

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16

Kolmer, J. A. "Genetics of Leaf Rust Resistance in the Soft Red Winter Wheat Cultivars Coker 9663 and Pioneer 26R61." Plant Disease 94, no. 5 (2010): 628–32. http://dx.doi.org/10.1094/pdis-94-5-0628.

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Leaf rust, caused by the fungus Puccinia triticina, is an important disease of soft red winter wheat cultivars that are grown in the southern and eastern United States. The objectives of this study were to identify the leaf rust resistance genes in two soft red winter wheat cultivars, Coker 9663 and Pioneer 26R61, that have been widely grown and were initially highly resistant to leaf rust. Both cultivars were crossed with the leaf-rust-susceptible spring wheat cv. Thatcher and the F1 plants were crossed to Thatcher to obtain backcross (BC1) F2 families. In seedlings, the Thatcher/Coker 9663 B

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17

Baloch, K. K., and J. M. Bonman. "Rice Seedling Resistance to Brown Spot (Bs)." International Rice Research Newsletter 10, no. 5 (1985): 8–9. https://doi.org/10.5281/zenodo.7099822.

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This article 'Rice Seedling Resistance to Brown Spot (Bs)' appeared in the International Rice Research Newsletter series, created by the International Rice Research Institute (IRRI). The primary objective of this publication was to expedite communication among scientists concerned with the development of improved technology for rice and for rice based cropping systems. This publication will report what scientists are doing to increase the production of rice in as much as this crop feeds the most densely populated and land scarce nations in the world.

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18

Ballinger, DJ, and PA Salisbury. "Seedling and adult plant evaluation of race variability in Leptosphaeria maculans on Brassica species in Australia." Australian Journal of Experimental Agriculture 36, no. 4 (1996): 485. http://dx.doi.org/10.1071/ea9960485.

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Seedling and adult plant studies were used to identify the race structure of Leptosphaeria maculans (the cause of blackleg) on oilseed Brassica species in Australia. Host-pathogen interactions using a set of 12 differential host lines identified 14 seedling relationship, however, between seedling and adult plant reactions to individual isolates, indicating that seedling and adult plant resistance are under different genetic control. While non-specific adult plant resistance was observed in the B. napus line Jet Neuf, host-pathogen interactions confirmed the existence of race-specific adult pla

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19

Ye, Long Hua, Qiu Jing Li, Li Xue, Gan Wen Lie, Xiao Li Hou, and Hong Yue Chen. "Effects of Ozone and Drought on Physiological Characteristics of Three Seedling Types in South China." Applied Mechanics and Materials 522-524 (February 2014): 1089–97. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.1089.

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Seedlings of Michelia macclurei, Cinnamomum camphora and Rhodoleiachampionii were placed in open-top chambers (OTC) with two ozonic treatments including E40 (nature air, 40 ppb) and E150 (150 ppb) and two water treatments. Physiological indexes such as chlorophyll, soluble sugar, soluble protein, proline, MDA and SOD of three seedling types were evaluated. With increasing experimental time, chlorophyll content generally decreased or remained steady, soluble sugar content increased followed by a decrease and SOD activity increased for the three seedling types in ozone treatment, drought treatme

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20

Zhu, Shuquan, Kurt J. Leonard, and Heidi F. Kaeppler. "Quantitative Trait Loci Associated with Seedling Resistance to Isolates of Puccinia coronata in Oat." Phytopathology® 93, no. 7 (2003): 860–66. http://dx.doi.org/10.1094/phyto.2003.93.7.860.

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In our previous report, quantitative trait loci (QTL) for field adult plant resistance to crown rust were identified in an oat population of 152 F5:6 recombinant inbred lines from the cross of ‘Ogle’ (susceptible)/MAM17-5 (resistant). The objectives of the present study were to identify in the same population, the number, genomic location, and effect of QTL and digenic QTL epistasis associated with greenhouse seedling resistance to isolates of Puccinia coronata to determine if the QTL detected are isolate-specific and to compare them with previously detected QTL for field resistance. Reaction

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21

Gould, Nick, Tony Reglinski, Mike Spiers, and Joe T. Taylor. "Physiological trade-offs associated with methyl jasmonate - induced resistance in Pinus radiata." Canadian Journal of Forest Research 38, no. 4 (2008): 677–84. http://dx.doi.org/10.1139/x07-193.

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Methyl jasmonate (MeJA) can induce defence responses in plants to pathogen attack, but it can also have consequences for plant growth. The transient effects of exogenous MeJA treatment on the resistance of Monterey pine ( Pinus radiata D. Don) seedlings to Diplodia pinea (Desm.) Kickx. and some physiological parameters affecting the impact of treatment on seedling growth were investigated. Following foliar application of 4.5 mmol·L–1 MeJA, disease resistance was greatest 1–2 weeks after treatment and declined with time thereafter. Elevated disease resistance was accompanied by a reduction in s

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22

Navarro Cerrillo, R. Mª, L. Gallo Ibáñez, Mª E. Sánchez Hernández, P. Fernández Rebollo, and A. Trapero Casas. "Effect of phosphoric fertilization on the resistance of holm oak and cork oak to Phytophthora cinnamomi Rands." Forest Systems 13, no. 3 (2004): 550–58. http://dx.doi.org/10.5424/srf/2004133-00853.

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The oomycete Phytophthora cinnamomi Rands is the mean responsible for oak decline in southern Spain. This paper investigates the relationship between phosphoric fertilization of Quercus ilex and Q. suber seedlings and resistance to the disease caused by Phytophthora cinnamomi. The study was conducted on holm oak and cork oak seedlings previously submitted to a phosphoric fertilization programme involving four different treatments, namely: Phosphate-A (3 mg P2O5 seedling), Phosphate-B (6 mg P2O5 seedling), Phosphite (0.15 mg de P2O5 seedling) and No Fertilization. Tests were conducted in greenh

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23

Loughman, R., E. S. Lagudah, M. Trottet, R. E. Wilson, and A. Mathews. "Septoria nodorum blotch resistance in Aegilops tauschii and its expression in synthetic amphiploids." Australian Journal of Agricultural Research 52, no. 12 (2001): 1393. http://dx.doi.org/10.1071/ar01034.

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A collection of 433 Aegilops tauschii was screened for response to infection with Stagonospora nodorum. Resistance similar or marginally superior to the range observed in spring wheat genotypes was readily identified. Three lines, RL5271, Aus18911, and Aus21712, were resistant to a range of pathogen isolates and were similar in resistance to a highly resistant French line, No.33. Accessions of Ae. tauschii assessed as resistant or susceptible as seedlings had corresponding reactions when tested as adult plants, with resistance being commonly expressed as restricted lesion development. Infectio

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24

Herrera-Foessel, S. A., R. P. Singh, C. X. Lan, et al. "Yr60, a Gene Conferring Moderate Resistance to Stripe Rust in Wheat." Plant Disease 99, no. 4 (2015): 508–11. http://dx.doi.org/10.1094/pdis-08-14-0796-re.

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Stripe rust, caused by Puccinia striiformis f. sp. tritici W., is a devastating disease of wheat worldwide. A new stripe rust resistance gene with moderate seedling and adult plant resistance was mapped using an F5 recombinant inbred line (RIL) population developed from the cross of the resistant parent ‘Almop’ with the susceptible parent ‘Avocet’. The parents and RILs were phenotyped for seedling stripe rust response variation in a greenhouse and in field trials at Toluca, Mexico for 2 years. Almop showed moderate levels of resistance at both seedling and adult plant stages compared with the

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Cséplö, M., M. Csösz, M. Gál, O. Veisz, and G. Vida. "Seedling resistance to Stagonospora nodorum blotch in wheat genotypes." Czech Journal of Genetics and Plant Breeding 49, No. 2 (2013): 77–85. http://dx.doi.org/10.17221/69/2011-cjgpb.

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In two independent experiments set up in the greenhouse the seedling resistance to Stagonospora nodorum blotch was investigated in 92 varieties, breeding lines and genotypes with a known genetic background. The greatest area under the disease progress curve calculated from lesion type was 37.06, while in the case of the most resistant genotype this value was 0.38. Many of the lines and varieties bred in Martonv&aacute;s&aacute;r proved to have excellent resistance in terms of both percentage of infected leaf area and lesion type. Observations indicate that, depending on the aim of the

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Dranski, João Alexandre Lopes, Ubirajara Contro Malavasi, Marlene de Matos Malavasi, and Douglass Frederick Jacobs. "Effect of ethephon on hardening of Pachystroma longifolium seedlings." Revista Árvore 37, no. 3 (2013): 401–7. http://dx.doi.org/10.1590/s0100-67622013000300003.

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Immediately after planting, tree seedlings face adverse environmental and biotic stresses that must be overcome to ensure survival and to yield a desirable growth. Hardening practices in the nursery may help improve seedling stress resistance through reduction of aboveground plant tissues and increased root volume and biomass. We conducted an assay to quantify changes in the morphogenesis following application of ethephon on seedlings of Pachystroma longifolium (Ness) I. M. Johnst.during hardening. The results showed no effect of the ethephon treatments on the number of leaves but a reduction

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Briggs, K. G., and G. J. Dunn. "Variation amongst Canadian six-row spring barley cultivars for germination and emergence characteristics in controlled environments and in the field." Canadian Journal of Plant Science 80, no. 2 (2000): 247–53. http://dx.doi.org/10.4141/p99-054.

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Information is lacking concerning the extent of variability in Canadian six-row barley cultivars for differences in potential field germination vigour and other germination characteristics, and the extent to which these traits can be predicted from laboratory tests. This study was conducted to evaluate the extent to which a genetically diverse range of Western Canadian six-row barley cultivars differ in germination resistance and early seedling vigour or emergence rate under controlled environments and in the field, over a range of temperature stress conditions. Vigour was assessed by measurin

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Šņepste, Ilze, Baiba Krivmane, Vilnis Šķipars, Astra Zaluma, and Dainis E. Ruņģis. "Induction of Defense Responses in Pinus sylvestris Seedlings by Methyl Jasmonate and Response to Heterobasidion annosum and Lophodermium seditiosum Inoculation." Forests 12, no. 5 (2021): 628. http://dx.doi.org/10.3390/f12050628.

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The induction of defense responses in Pinus sylvestris L. seedlings by methyl jasmonate (MeJA) was investigated in three experiments. Two different MeJA application methods were tested, and induction of defense responses was assayed by seedling inoculation with Heterobasidion annosum (Fr.) Bref. and Lophodermium seditiosum Minter, Staley and Millar. In the first experiment, five-year-old P. sylvestris ramets of one clone were directly treated with MeJA, followed by inoculation with H. annosum. In the second experiment, open-pollinated Scots pine seedlings were treated with MeJA by direct spray

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Hassan, J. A., Y. J. Zhou, and J. D. Lewis. "A Rapid Seedling Resistance Assay Identifies Wild Tomato Lines That Are Resistant to Pseudomonas syringae pv. tomato Race 1." Molecular Plant-Microbe Interactions® 30, no. 9 (2017): 701–9. http://dx.doi.org/10.1094/mpmi-11-16-0247-r.

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Bacterial speck caused by Pseudomonas syringae has historically been controlled by the Pto/Prf gene cluster. Emerging strains like P. syringae pv. tomato race 1 overcome resistance conferred by Pto/Prf, and can cause serious crop loss under appropriate environmental conditions. We developed a rapid assay to screen wild tomato seedlings for resistance to P. syringae pv. tomato race 1. We established the seedling resistance assay using the well-characterized P. syringae pv. tomato race 0 strain, DC3000, which is recognized in tomato cultivars carrying Pto/Prf (PtoR) and causes disease in isogeni

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Moler, Ehren R. V., Keith Reinhardt, Richard A. Sniezko, and Ken Aho. "First Report of Fungal Endophyte Communities and Non-Defensive Phytochemistry of Biocontrol-Inoculated Whitebark Pine Seedlings in a Restoration Planting." Forests 13, no. 6 (2022): 824. http://dx.doi.org/10.3390/f13060824.

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Plant endosymbionts (endophytes) influence host plant health and express genotype-dependent ecological relationships with plant hosts. A fungal species intended to confer host plant resistance to a forest pathogen was used as inoculum to test for effects of inoculation on disease resistance, microbiomes, and phytochemistry of a threatened pine species planted in a restoration setting. Correlations of inoculation presence/absence, phytochemistry, spatial location of seedlings, maternal seed sources, and fungal endophytic communities in the foliage of six-year-old whitebark pine (Pinus albicauli

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Babiker, E. M., T. C. Gordon, J. M. Bonman, et al. "Rapid Identification of Resistance Loci Effective Against Puccinia graminis f. sp. tritici Race TTKSK in 33 Spring Wheat Landraces." Plant Disease 100, no. 2 (2016): 331–36. http://dx.doi.org/10.1094/pdis-04-15-0466-re.

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Wheat breeders worldwide are seeking new sources of resistance to Puccinia graminis f. sp. tritici race TTKSK. To prioritize field-resistant landraces for follow-up genetic studies to test for the presence of new resistance genes, seedling response to P. graminis f. sp. tritici race TTKSK, molecular markers linked to specific Sr genes, segregation ratios among progeny from crosses, and bulked segregant analyses (BSA) were used. In total, 33 spring wheat landraces with seedling resistance to P. graminis f. sp. tritici race TTKSK were crossed to a susceptible genotype, LMPG-6. The segregation ra

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32

Robert, Emilie, Suzanne Brais, Brian D. Harvey, and David Greene. "Seedling establishment and survival on decaying logs in boreal mixedwood stands following a mast year1This article is one of a selection of papers from the International Symposium on Dynamics and Ecological Services of Deadwood in Forest Ecosystems." Canadian Journal of Forest Research 42, no. 8 (2012): 1446–55. http://dx.doi.org/10.1139/x2012-085.

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In the boreal forest, establishment of tree regeneration is tightly linked to both mast years and the availability of adequate germination beds for seedlings. We took advantage of a mast year (2006) in the eastern boreal mixedwood to compare seedling establishment in 2007 and seedling survival 2 and 4 years later on sections of fallen logs and equivalent areas of adjacent forest floor. Several factors that could explain establishment of seedlings on logs were measured, including wood resistance, density, moisture content, and C/N ratio. Our results show that small-seeded species, such as white

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33

Franke, M. D., T. B. Brenneman, and C. C. Holbrook. "Identification of Resistance to Rhizoctonia Limb Rot in a Core Collection of Peanut Germ Plasm." Plant Disease 83, no. 10 (1999): 944–48. http://dx.doi.org/10.1094/pdis.1999.83.10.944.

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Diseases caused by Rhizoctonia solani lead to significant reductions in peanut yields and quality throughout the world. A subset of accessions from the peanut germ plasm core collection plus the commercial cultivars Florunner, Southern Runner, Georgia Browne, and Georgia Green were evaluated for resistance to limb and seedling hypocotyl infections caused by R. solani. Georgia Green and core accessions 95 (PI 497351), 197 (PI 331326), 208 (PI 274193), 244 (PI 343361), 246 (PI 343398), and 524 (PI 288178) had levels of resistance comparable to Georgia Browne, the only commercial cultivar reporte

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34

Ni, Ming, Zhenzhou Gao, Hong Chen, Chen Chen, and Fangyuan Yu. "Exponential Fertilization Regimes Improved Growth and Nutrient Status of Quercus nuttallii Container Seedlings." Agronomy 12, no. 3 (2022): 669. http://dx.doi.org/10.3390/agronomy12030669.

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Background: The conventional fertilization regime ignores the allometric characteristics of Quercus nuttallii seedlings, challenging them to meet the nutritional needs at each growth stage. This study was conducted to determine the impact of exponential fertilization on the growth and nutrient status of Q. nuttallii container seedlings. Methods: Two fertilization regimes (average/exponential) were performed on Q. nuttallii container seedlings, and varied gradients (0, 300, 500, 700, and 900 mg/seedling) of N supply were set for the two regimes. Result: N application promoted the seedling heigh

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35

Tang, Jiao, Carlos Alberto Busso, Deming Jiang, et al. "Experimental sand burial affects seedling survivorship, morphological traits, and biomass allocation of <i>Ulmus pumila</i> var. <i>sabulosa</i> in the Horqin Sandy Land, China." Solid Earth 7, no. 4 (2016): 1085–94. http://dx.doi.org/10.5194/se-7-1085-2016.

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Abstract. As a native tree species, Ulmus pumila var. sabulosa (sandy elm) is widely distributed in the Horqin Sandy Land, China. However, seedlings of this species have to withstand various depths of sand burial after emergence because of increasing soil degradation, which is mainly caused by overgrazing, climate change, and wind erosion. An experiment was conducted to evaluate the changes in its survivorship, morphological traits, and biomass allocation when seedlings were buried at different burial depths: unburied controls and seedlings buried vertically up to 33, 67, 100, or 133 % of thei

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36

Oelke, L. M., and J. A. Kolmer. "Characterization of Leaf Rust Resistance in Hard Red Spring Wheat Cultivars." Plant Disease 88, no. 10 (2004): 1127–33. http://dx.doi.org/10.1094/pdis.2004.88.10.1127.

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Abstract (sommario):

Leaf rust, caused by Puccinia triticina Eriks., is the most common disease of wheat (Triticum aestivum L.) in the United States and worldwide. The objective of this study was to characterize seedling and adult plant leaf rust resistance in hard red spring wheat cultivars grown in Minnesota, North Dakota, and South Dakota, and postulate the identity of the seedling leaf rust resistance genes in the cultivars. Twenty-six cultivars, near-isogenic lines of Thatcher wheat that differ for single leaf rust resistance genes, and three wheat cultivars with known leaf rust resistance genes, were tested

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37

Enebak, S. A., and W. A. Carey. "Plant Growth-Promoting Rhizobacteria May Reduce Fusiform Rust Infection in Nursery-Grown Loblolly Pine Seedlings." Southern Journal of Applied Forestry 28, no. 4 (2004): 185–88. http://dx.doi.org/10.1093/sjaf/28.4.185.

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Abstract Fusiform rust caused by Cronartium quercuum f.sp. fusiforme (Hedg. & Hunt ex Cumm.) is the most damaging stem disease of Pinus spp. in the southern United States. Plant-growth-promoting rhizobacteria (PGPR) have induced systemic resistance in many host-pathogen systems. To determine whether rhizobacteria could induce systemic resistance to fusiform rust infection, loblolly pine (Pinus taeda L.) seedlings were evaluated for rust resistance following preemergence seed and post emergence foliar sprays with three bacterial strains. Treated seed was sown in one bare root nursery in Ala

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38

Mandal, Subhankar, and Christopher S. Cramer. "Screening of USDA Onion Germplasm for Fusarium Basal Rot Resistance." Horticulturae 7, no. 7 (2021): 174. http://dx.doi.org/10.3390/horticulturae7070174.

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Abstract (sommario):

Fusarium basal rot (FBR) caused by Fusarium oxysporum f. sp. cepae (FOC) is a major threat to onion (Allium cepa L.) production and marketing worldwide. Finding new sources of FBR-resistance to develop synthetic cultivars is a priority for onion breeders. As there are no FBR-resistant short-day onion cultivars, 85 U.S. National Plant Germplasm System plant introduction onion accessions that originated from 23 different countries were screened for their FBR susceptibility. To compare FBR susceptibility of these accessions at their seedling and mature bulb stages, a susceptible check cultivar, N

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39

Erb, W. Alan, Arlen D. Draper, and Harry J. Swartz. "Screening Interspecific Blueberry Seedling Populations for Drought Resistance." Journal of the American Society for Horticultural Science 113, no. 4 (1988): 599–604. http://dx.doi.org/10.21273/jashs.113.4.599.

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Abstract (sommario):

Abstract Open-pollinated species, interspecific hybrid seedling populations, and selected clones propagated by softwood cuttings and tissue culture were used to further evaluate the use of dry soil to screen blueberry seedlings for drought resistance. These different propagation types of Vaccinium (subgenus Cyanococcus) were screened for drought resistance in a Galestown fine sandy loam soil. The soil was permitted to dry to progressively higher soil tension levels to a maximum of 0.8 MPa. The plants were evaluated by scoring them on a 1 to 9 shoot damage rating scale and by determining the fr

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40

Sun, Guo Rong, Xue Li Wu, Gang Chen, et al. "The Function of Chloroplast GST of Puccinellia Tenuiflora Seedling Leaves in Resistance to Na₂CO₃Stress." Advanced Materials Research 343-344 (September 2011): 712–20. http://dx.doi.org/10.4028/www.scientific.net/amr.343-344.712.

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Abstract (sommario):

In order to probe into orderliness changes of Glutathione S-Transferase (GST) of chloroplast ofPuccinellia tenuifloraseedlings under Na2CO3stress and its function in resistance to Na2CO3stress, relative electric conductance, GST activity and the O2-.produce rate of the chloroplast, and the osmotic potential of leaves, and the osmotic potential of culture solution ofP. tenuifloraseedlings under different Na2CO3stress were concerned. The result shows that in the Na2CO3stress range of 0～0.4%, along with the increase of its intensity under different Na2CO3stress intensity, GST activity of the chlo

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41

Jelev, Natalia. "The influence of heat shock on the rate of reserves allocated by wheat seeds for germination and growth." Bulletin of the Academy of Sciences of Moldova. Life Sciences, no. 1 (343) (January 2022): 60–69. http://dx.doi.org/10.52388/1857-064x.2021.1.08.

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Abstract (sommario):

We studied the accumulation and consumption of biomass by five-day-old seedlings of various wheat varieties (Triticum aestivum L.) grown from control and exposed to heat shock (HS) seeds. The suppression shoot and roots growth intensified with the temperature, which caused HS. With increasing the temperature (+50°С, +51°С, +52°С și +53°С) of HS, the biomass of the endosperm of the seeds transferred to the seedling, and spent on respiration during seed germination, and seedling growth decreased. Moreover, the effect of HS was more pronounced on the biomass of endosperm substances transferred to

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42

Yuan, Zhiheng, Chuntian Wang, ShiPeng Li, Xiao Li, and Fuju Tai. "Effects of different plant hormones or PEG seed soaking on maize resistance to drought stress." Canadian Journal of Plant Science 94, no. 8 (2014): 1491–99. http://dx.doi.org/10.4141/cjps-2014-110.

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Abstract (sommario):

Yuan, Z., Wang, C., Li, S., Li, X. and Tai, F. 2014. Effects of different plant hormones or PEG seed soaking on maize resistance to drought stress. Can. J. Plant Sci. 94: 1491–1499. Drought stress has a major impact on plant growth and productivity, and seed soaking is an important way to increase seedling resistance to drought stress. This study investigated whether drought hardening chemicals, such as polyethylene glycol (PEG), or plant growth regulators enhance plant drought tolerance. The effects of PEG and several plant hormones, such as indoleacetic acid, gibberellic acid 3, 6-benzylamin

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43

Nandhini, D. Udhaya, and E. Somasundaram. "Effects of rhizobial nod factors (Lipo chitooligosaccharide) on seedling growth of maize (Zea mays L.) under salt stress." Bangladesh Journal of Botany 47, no. 4 (2018): 831–37. http://dx.doi.org/10.3329/bjb.v47i4.47359.

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Abstract (sommario):

Effects of nod factors (lipo chitooligosaccharide) on seedling growth of maize under salt stress have been studied. The study was framed with seed priming using lipo chitooligosaccharide (LCO) a nod factor @ 4 ml/kg of seeds and without priming on maize seedling growth which was exposed to different levels of salinity (0, 2, 4, 6, 8 and 10 dS/m). Salinity negatively influenced the seedling growth of maize. However nod factor treated maize seedlings had relatively higher germination percentage, root length, shoot length, reducing sugars and amylase activity. Correlation analysis revealed positi

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44

Kim, Sieun, Jong-Hwan Shin, Ha-Kyoung Lee, et al. "Development of an Effective Method to Evaluate Resistance of Onion (Allium cepa L.) Cultivars to Fusarium Basal Rot." Research in Plant Disease 30, no. 3 (2024): 288–93. http://dx.doi.org/10.5423/rpd.2024.30.3.288.

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Abstract (sommario):

Fusarium basal rot (FBR), caused by the ascomycete fungus <i>Fusarium oxysporum</i>, is an economically important disease of onion worldwide. The most economical and effective way to manage FBR would be the use of FBR resistant onion cultivars. This study was carried out to develop a rapid screening method for resistant onion cultivars in seedling stage. We used the <i>F. oxysporum</i> 19-385 isolate, which causes damping-off in onion seedlings and basal rot in onion bulbs. We optimized broth incubation and medium composition for the production of inoculum, and determin

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45

Geange, Sonya R., Meisha-Marika Holloway-Phillips, Veronica F. Briceño, and Adrienne B. Nicotra. "Aciphylla glacialis mortality, growth and frost resistance: a field warming experiment." Australian Journal of Botany 67, no. 8 (2019): 599. http://dx.doi.org/10.1071/bt19034.

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Abstract (sommario):

Decreasing snow depth and earlier snowmelt in alpine regions are expected to expose plants to a greater range of thermal extremes. Thus, paradoxically, in addition to increasing mean temperatures, aseasonal frost is likely to emerge as a major determinant of plant survival and development under a warming climate. Through the use of open top chambers, we assessed the effects of simulated warming on seedlings of the alpine herb Aciphylla glacialis (F.Muell.) Benth, sourced from provenances that vary in thermal characteristics. We hypothesised that seedlings grown at elevated temperature would ha

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46

Powers, H. R., and J. F. Kraus. "A Comparison of Fusiform Rust-Resistant Loblolly Pine Seed Sources." Southern Journal of Applied Forestry 10, no. 4 (1986): 230–32. http://dx.doi.org/10.1093/sjaf/10.4.230.

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Abstract (sommario):

Abstract A greenhouse inoculation study compared resistance to fusiform rust (Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme) of loblolly pine (Pinus taeda L.) seedlings derived from bulk seed produced in 4 rust-resistant seed orchards, 1 rust-resistant geographic seed source (Livingston Parish, LA), and a control treatment of improved loblolly from a first-generation production orchard. The rust-resistant orchards included 2 forest industry orchards developed from the most rust-resistant clones available within a tree improvement cooperative (1st generation), and both a clonal

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47

Boyden*, Laurie E., and Peter Cousins. "Segregation of Resistance to Root-knot Nematodes in a Vitis Nesbittiana Hybrid Population." HortScience 39, no. 4 (2004): 804C—804. http://dx.doi.org/10.21273/hortsci.39.4.804c.

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Abstract (sommario):

Development of rootstocks resistant to root-knot nematodes (Meloidogyne spp.) is a priority in grape breeding. The N allele, present in Harmony and Freedom rootstocks, confers resistance to N-avirulent strains of Meloidogyne. Extensive planting of rootstocks containing N has led to the development of N-virulent nematode strains, prompting a search for new resistance alleles. A seedling population derived from Vitis nesbittiana Comeaux was evaluated to investigate the genetic control of nematode resistance in this species. Hybridization with easily propagated rootstock selections will be requir

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Harder, D. E., J. Chong, P. D. Brown, and J. W. Martens. "Inheritance of resistance to Puccinia coronata avenae and P. graminis avenae in an accession of Avena sterilis from Spain." Genome 33, no. 2 (1990): 198–202. http://dx.doi.org/10.1139/g90-031.

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Abstract (sommario):

Accessions of wild Avena spp. obtained from the Iberian Peninsula were screened for resistance to oat crown and oat stem rust. Of a number of accessions which showed resistance, A. sterilis accession IB3056 was selected for further genetic analysis because it had combined resistance to both crown and stem rusts and as a hexaploid was readily hybridizable with A. sativa. IB3056 was crossed and backcrossed with the susceptible cultivar 'Makuru' and progeny were analyzed for segregation to a range of rust races. A single dominant gene conferred resistance to crown rust. The resistance was highly

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49

Sun, Yujun, Yunhan He, Ali Raza Irfan, et al. "Exogenous Brassinolide Enhances the Growth and Cold Resistance of Maize (Zea mays L.) Seedlings under Chilling Stress." Agronomy 10, no. 4 (2020): 488. http://dx.doi.org/10.3390/agronomy10040488.

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Abstract (sommario):

This paper aims to elucidate the effects of exogenous brassinolide (BL) on maize germination and seedling growth under chilling stress. The cold-resistant maize hybrid Tiannong 9 and the cold-sensitive hybrid Tianhe 1 were soaked at the germination stage (6 °C) and leaves were sprayed at seedling stage (4 °C), with BL at concentrations of 0, 0.01, 0.1, and 1 mg/L. The germination rate of the maize seeds and the changes in seedling biomass, antioxidant, photosynthetic, and plant endogenous hormone systems and chloroplast ultrastructures were determined. The results showed that the optimum conce

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50

Long, Jianting, Mengjie Dong, Chuanqi Wang, and Yanjun Miao. "Effects of drought and salt stress on seed germination and seedling growth of Elymus nutans." PeerJ 11 (August 24, 2023): e15968. http://dx.doi.org/10.7717/peerj.15968.

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Abstract (sommario):

Drought and soil salinization are global environmental issues, and Elymus nutans play an important role in vegetation restoration in arid and saline environments due to their excellent stress resistance. In the process of vegetation restoration, the stage from germination to seedling growth of forage is crucial. This experiment studied the effects of PEG-6000 simulated drought stress and NaCl simulated salinization stress on the germination of E. nutans seeds, and explored the growth of forage seedlings from sowing to 28 days under drought and salinization stress conditions. The results showed

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