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Artykuły w czasopismach na temat „Plant leaf position”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Beadle, James, C. James Taylor, Kirsti Ashworth, and David Cheneler. "Plant Leaf Position Estimation with Computer Vision." Sensors 20, no. 20 (2020): 5933. http://dx.doi.org/10.3390/s20205933.

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Autonomous analysis of plants, such as for phenotyping and health monitoring etc., often requires the reliable identification and localization of single leaves, a task complicated by their complex and variable shape. Robotic sensor platforms commonly use depth sensors that rely on either infrared light or ultrasound, in addition to imaging. However, infrared methods have the disadvantage of being affected by the presence of ambient light, and ultrasound methods generally have too wide a field of view, making them ineffective for measuring complex and intricate structures. Alternatives may incl

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Röll, Georg, Jens Hartung, and Simone Graeff-Hönninger. "Determination of Plant Nitrogen Content in Wheat Plants via Spectral Reflectance Measurements: Impact of Leaf Number and Leaf Position." Remote Sensing 11, no. 23 (2019): 2794. http://dx.doi.org/10.3390/rs11232794.

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The determination of plant nitrogen (N) content (%) in wheat via destructive lab analysis is expensive and inadequate for precision farming applications. Vegetation indices (VI) based on spectral reflectance can be used to predict plant N content indirectly. For these VI, reflectance from space-borne, airborne, or ground-borne sensors is captured. Measurements are often taken at the canopy level for practical reasons. Hence, translocation processes of nutrients that take place within the plant might be ignored or measurements might be less accurate if nutrient deficiency symptoms occur on the

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Hu, Yun-Yi, Wen-Zhang Qian, Lu Yi, et al. "Chemical Composition and Antioxidant Activity of Zanthoxylum armatum Leaves in Response to Plant Age, Shoot Type and Leaf Position." Forests 14, no. 5 (2023): 1022. http://dx.doi.org/10.3390/f14051022.

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Zanthoxylum armatum (Z. armatum) leaves represent more than 50% of by-products with promising potential applications, and there are still largely unknown variations in chemical composition and antioxidant activity in its leaves. In the present study, the changes in carbon (C), nitrogen (N) and phosphorous (P), soluble protein (SP), amino acid (AA), soluble sugar (SS), total phenol (TP) and total flavonoids (TF) content as well as antioxidant capacity in Z. armatum leaves from two plant ages between two shoot types and three leaf positions were investigated. Our results showed that there are si

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ALVES DOS SANTOS, MAURICIO REGINALDO, Eric Jonisson Rios Bisi, and Leormando Fortunato Dornelas Júnior. "Propagation of Piper carniconnectivum through leaf cuttings." International Journal for Innovation Education and Research 7, no. 10 (2019): 15–20. http://dx.doi.org/10.31686/ijier.vol7.iss10.1674.

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The regeneration of roots and shoots through leaf cuttings is a feasible technique for plant clonal propagation, using a quite available organ, which can be collected without great damage to the plant. A protocol of propagation through leaf cuttings was defined to Piper carniconnectivum, a plant whose compounds have great potential use in medicine and agriculture. Leaves were cut in halves (apical and petiolar) by transverse cutting in the middle of the leaf blade. The petiolar parts were immersed into a solution of indole 3-butyric acid (IBA) at 1000 ppm for 30 seconds, or not submitted to th

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Van Delden, A., and O. Carisse. "Effect of plant age, leaf age and leaf position on infection of carrot leaves by Cercospora carotae." Phytoprotection 74, no. 2 (2005): 75–87. http://dx.doi.org/10.7202/706038ar.

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A greenhouse study was conducted to determine the effects of plant age, leaf age and leaf position on infection of carrot (Daucus carota var. sativa) by Cercospora carotae. Infection was quantified as the number of lesions cm-2 of leaf surface and the length of incubation period. The relative number of lesions decreased linearly with increasing plant age from 39- to 60-d-old plants, and remained low from 60- to 71-d-old plants. The incubation period increased from 9.0 to 16.6 d, with increasing plant age. Relative number of lesions decreased with increasing leaf age from 1 to 36 d, but the var

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Nguleni, Faith, Devotha Nyambo, Jacob Lisuma, and Shubi Kaijage. "Dataset Development for Automated Grade Labelling of Virginia Flue-Cured Tobacco Leaves in Tanzania: A Focus on Stalk Leaf Position." Indian Journal Of Science And Technology 18, no. 7 (2025): 550–58. https://doi.org/10.17485/ijst/v18i7.3608.

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Objectives: This study aimed at developing a dataset for automated grade labeling of Virginia flue-cured tobacco leaves based on stalk leaf position by focusing on quality, colour and anomalies. Methods: Virginia flue-cured tobacco leaves were collected from four Tanzanian tobacco regions: Tabora municipal, Uyui, Urambo and Kaliua. Canon 5D Mark III cameras with a Canon EF 100mm F/2.8L Macro IS USM lens were used to capture tobacco leaves. The collected data concentrated on the upper leaves of the tobacco plant, also known as leaf position. In Tanzania, the tobacco plant position is a very cru

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Miljkovic, Danijela, Stevan Avramov, Vukica Vujic, et al. "Between-clone, between-leaf and within-leaf variation in leaf epidermis traits in Iris pumila clones." Genetika 45, no. 2 (2013): 297–308. http://dx.doi.org/10.2298/gensr1302297m.

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The goal of this study was to analyze variation and covariation in epidermal characteristics (epidermal cell density -ECD, stomata density - SD, and stomata index - SI) on Iris pumila clones on between-clone, between-leaf and within-leaf levels. ECD (similar to the pattern previously observed for SD) increased from the base to the top of leaf, while SI remained constant. Results of profile analyses indicated that clones, individual plants whitin clones (ramets), and three successive leaves on the same plant were not significantly different for examined characteristics, but genetic variation fo

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8

Gąsowski, Andrzej. "Influence of wheat leaf position on leaf rust severity." Euphytica 48, no. 3 (1990): 211–14. http://dx.doi.org/10.1007/bf00023651.

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Visker, M. H. P. W., L. C. P. Keizer, D. J. Budding, L. C. Van Loon, L. T. Colon, and P. C. Struik. "Leaf Position Prevails Over Plant Age and Leaf Age in Reflecting Resistance to Late Blight in Potato." Phytopathology® 93, no. 6 (2003): 666–74. http://dx.doi.org/10.1094/phyto.2003.93.6.666.

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The effects of plant age, leaf age, and leaf position on race-nonspecific resistance against Phytophthora infestans were investigated in a series of field and controlled environment experiments with five different potato (Solanum tuberosum) cultivars. Leaf position proved to be the most significant factor; apical leaves were far more resistant to late blight than basal leaves. Plant age and leaf age had only minor effects; therefore, the resistance of a specific leaf remained about the same during its entire lifetime. The gradual increase in late blight resistance from basal leaves to apical l

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Hejnák, V., H. Hniličková, and F. Hnilička. "Effect of ontogeny, heterophylly and leaf position on the gas exchange of the hop plant." Plant, Soil and Environment 60, No. 11 (2014): 525–30. http://dx.doi.org/10.17221/671/2014-pse.

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This paper evaluates the influence of ontogeny and the position of bine and offshoot leaves on the rate of photosynthesis (P<sub>n</sub>), transpiration (E) and stomatal conductance (g<sub>s</sub>) in hop plants. In the ontogeny influencing P<sub>n</sub>, E and g<sub>s</sub> among hops. The highest P<sub>n</sub> was measured in phase 81&ndash;89 BBCH and E and g<sub>s</sub> in phase 61&ndash;69 BBCH. The P<sub>n</sub> increased over the course of ontogeny from the 1<sup>st</sup> to 3<sup&

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Okutani, Iwane, and Nobuo Sugiyama. "OXALATE CONCENTRATION IN SPINACH LEAVES DURING ONTOGENESIS." HortScience 27, no. 6 (1992): 642c—642. http://dx.doi.org/10.21273/hortsci.27.6.642c.

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Changes in oxalate concentrations in individual leaves during ontogenesis were examined by a sequential sampling of spinach plants grown in solution culture. The period between initiation of two successive leaves was 1.58 days. Fresh weight of each leaf increased at a constant rate with time after the leaf became 1 cm in length. Oxalate concentrations in plant tops decreased gradually with plant age. Oxalate concentrations in each leaf remained constant during ontogenesis, and they were negatively correlated with the leaf position numbered from the base. Leaf growth rates and the relationship

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Faith, Nguleni, Nyambo Devotha, Lisuma Jacob, and Kaijage Shubi. "Dataset Development for Automated Grade Labelling of Virginia Flue-Cured Tobacco Leaves in Tanzania: A Focus on Stalk Leaf Position." Indian Journal of Science and Technology 18, no. 7 (2025): 550–58. https://doi.org/10.17485/IJST/v18i7.3608.

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<strong>Objectives:</strong> This study aimed at developing a dataset for automated grade labeling of Virginia flue-cured tobacco leaves based on stalk leaf position by focusing on quality, colour and anomalies. <strong>Methods:</strong> Virginia flue-cured tobacco leaves were collected from four Tanzanian tobacco regions: Tabora municipal, Uyui, Urambo and Kaliua. Canon 5D Mark III cameras with a Canon EF 100mm F/2.8L Macro IS USM lens were used to capture tobacco leaves. The collected data concentrated on the upper leaves of the tobacco plant, also known as leaf position. In T

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Mulyana, Erik, Sandra A. Aziz, Syarifah Iis Aisyah, and M. Rizal Martua Damanik. "Correlations Between Leaf N, P, K, Ca and Fe Levels and The Production of Metabolites in Torbangun (Coleus amboinicus Lour.)." Journal of Tropical Crop Science 2, no. 2 (2015): 17–27. http://dx.doi.org/10.29244/jtcs.2.2.17-27.

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Torbangun (Coleus amboinicus Lour) is a tropical plant from the Lamiaceae family. Torbangun leaves have a distinct aroma. Torbangun leaves have been traditionally used as a medicinal plant in North Sumatra, Indonesia. Bataknese lactating women in North Sumatra consumed torbangun leaves after giving birth with beliefs that it could increase their breast milk production (lactagogue), and that the leaves can function as anti-fungal and/or anti-bacterial, analgesic, to reduce blood cholesterol, and clean the human uterus. However, scientific evidence on this traditional herb is limited. This resea

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Danskin, Scott D., Pete Bettinger, Thomas R. Jordan, and Chris Cieszewski. "A Comparison of GPS Performance in a Southern Hardwood Forest: Exploring Low-Cost Solutions for Forestry Applications." Southern Journal of Applied Forestry 33, no. 1 (2009): 9–16. http://dx.doi.org/10.1093/sjaf/33.1.9.

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Abstract The global positioning system (GPS) exhibits much potential for forestry applications, where traditional methods of position determination still dominate. Recent advances in GPS technology may offer improved performance of GPS in forested conditions, and at a considerable cost advantage compared with previous GPS alternatives. We examined the use of several mapping- to recreation-grade GPS receivers across a topographic gradient and the influence of using the Wide Area Augmentation System (WAAS) to their performance under leaf-on and leaf-off conditions. Generally, the mapping-grade r

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Nogueira, Rodrigo do Rosario. "Leaf herbivory in Miconia albicans (Melastomataceae): an evaluation of leaf position and age." Acta Musei Silesiae, Scientiae Naturales 73, no. 3 (2024): 237–47. https://doi.org/10.2478/cszma-2024-0014.

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Abstract Leaf herbivory in Miconia albicans (Melastomataceae): an evaluation of leaf position and age – Abstract: Herbivory represents a critical interaction between insects and plants, involving physical defenses like trichomes that enhance plant resistance to herbivorous attacks, while galls—plant tumors— can drain nutrients from healthy tissues. This study aimed to assess foliar herbivory rates and analyze gall incidence in Miconia albicans in a cerrado stricto sensu area near Uberlândia, Minas Gerais, Brazil. From December 2013 to March 2014, herbivory rates were documented biweekly using

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Ashton, P. Mark S., Lydia P. Olander, Graeme P. Berlyn, Rajesh Thadani, and Ian R. Cameron. "Changes in leaf structure in relation to crown position and tree size of Betula papyrifera within fire-origin stands of interior cedar-hemlock." Canadian Journal of Botany 76, no. 7 (1998): 1180–87. http://dx.doi.org/10.1139/b98-128.

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Dimensions of anatomical and morphological attributes of leaves can influence physiological response to changes in environment over time. Linking structural attributes of leaves to crown position and tree size within naturally developing cohorts of trees can provide a clearer understanding of changes in crown morphology for a species. This study examined leaf anatomy and morphology of Betula papyrifera Marsh. growing in two stages of stand development of interior cedar-hemlock forest, northern British Columbia. Anatomical and morphological measurements of leaves located at six different positi

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Puntieri, Javier G., María S. Souza, Daniel Barthélémy, Cecilia Brion, Martín Nuñez, and Camilo Mazzini. "Preformation, neoformation, and shoot structure in Nothofagus dombeyi (Nothofagaceae)." Canadian Journal of Botany 78, no. 8 (2000): 1044–54. http://dx.doi.org/10.1139/b00-069.

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Buds in different positions along trunk, main branch, secondary branch, and short branch parent shoots of young Nothofagus dombeyi (Mirb.) Blume trees were dissected, and the number of organs of their rudimentary shoots was counted. Bud contents were compared with the number of organs of sibling shoots developed in positions equivalent to those of the dissected buds. Cataphyll number was relatively constant for all buds. The number of green leaf primordia differentiated in each bud depended both on the position of the bud on the parent shoot and on the size of the parent shoot. Sibling shoots

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Lee*, Sang Gyu, and Chiwon W. Lee. "Position of Source Leaf Affects Translocation and Distribution of C14 Photo-Assimilates in Tomato." HortScience 39, no. 4 (2004): 759C—759. http://dx.doi.org/10.21273/hortsci.39.4.759c.

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The relationship between source leaf position and the photo-assimilate translocation and distribution was characterized for tomato (Lycopersicon esculentum Mill.) grown in the greenhouse. Three different positions of source leaf on the stem (first node above or below the first fruit cluster and fifth node above the first fruit cluster) were tested for their influence on 14CO2 assimilation and transfer to different parts of the plant. The leaves at the fifth node above the first fruit cluster transferred the highest (57%) proportion of C14 to other plant parts, followed by leaves borne on the f

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Mulholland, Susan C., George Rapp Jr., Amy L. Ollendorf, and Ronald Regal. "Variation in phytolith assemblages within a population of corn (cv. Mandan Yellow Flour)." Canadian Journal of Botany 68, no. 8 (1990): 1638–45. http://dx.doi.org/10.1139/b90-210.

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This project investigates the effects of leaf side, leaf position, individual plant, and hill (or plant group) on phytolith assemblages from Zea mays L. cultivar Mandan Yellow Flour. Thirty-two samples were examined, and 200 phytoliths were classified from each sample. Statistical analysis indicates that leaf side is significant at the 0.05 level above random counting variation; leaf position, individual plant, and hill are not generally significant beyond the effect of leaf side. Analysis of a single sample, either a half or entire leaf, is not sufficient for compilation of representative phy

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Sirvydas, Algimantas, Vidmantas Kučinskas, Paulius Kerpauskas, Jūratė Nadzeikienė, and Albinas Kusta. "SOLAR RADIATION ENERGY PULSATIONS IN A PLANT LEAF." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 18, no. 3 (2010): 188–95. http://dx.doi.org/10.3846/jeelm.2010.22.

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Solar radiation energy is used by vegetation, which predetermines the existence of biosphere. The plant uses 1–2% of the absorbed radiant energy for photosynthesis. All the remaining share of the absorbed energy, accounting for 99–98%, converts into thermal energy in the plant leaf. At the lowest wind under natural surrounding air conditions, plant leaves change their position with respect to the Sun. An oscillating plant leaf receives a variable amount of solar radiation energy, which causes changes in the balance of plant leaf energies and a changing emission of heat in the leaf. The analysi

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Coelho, Paula S., Luísa Valério, and António A. Monteiro. "Leaf position, leaf age and plant age affect the expression of downy mildew resistance in Brassica oleracea." European Journal of Plant Pathology 125, no. 2 (2009): 179–88. http://dx.doi.org/10.1007/s10658-009-9469-4.

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Karimuna, Siti Rahmah, Sandra Arifin Aziz, and Maya Melati. "Correlations between Leaf Nutrient Content and the Production of Metabolites in Orange Jessamine (Murraya paniculata L. Jack) Fertilized with Chicken Manure." Journal of Tropical Crop Science 2, no. 1 (2015): 16–25. http://dx.doi.org/10.29244/jtcs.2.1.16-25.

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Plant secondary metabolites are unique sources for pharmaceuticals and food additives. Orange jessamine (Murraya paniculata) contains secondary metabolite that is beneficial to human health including lowering blood cholesterol levels, anti-obesity, and has the antioxidant capacity. Leaves of orange jessamine have several chemical constituents including L-cadinene, methyl-anthranilate, bisabolene, β-caryophyllene, geraniol, Carene, 5-guaiazulene, osthole, paniculatin, tannins, eugenol, citronelled, coumurrayin and coumarin derivatives. This study aimed to determine the correlation between leaf

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Farber, D. H., and C. C. Mundt. "Effect of Plant Age and Leaf Position on Susceptibility to Wheat Stripe Rust." Phytopathology® 107, no. 4 (2017): 412–17. http://dx.doi.org/10.1094/phyto-07-16-0284-r.

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In addition to pathogen propagule dispersal, disease spread requires successful infection of host tissue. In plant disease epidemiology, susceptibility of host tissue is often assumed to be constant. This assumption ignores changes in host phenology due to developmental stage. To examine this assumption, 3-, 4-, and 5-week-old wheat plants were inoculated with equal quantities of urediniospores of Puccinia striiformis f. sp. tritici, the causal agent of wheat stripe rust (WSR). Disease severity on each leaf was assessed and fit by mixed-effect linear model as a function of leaf position and pl

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Okutani, I., and N. Sugiyama. "Relationship between Oxalate Concentration and Leaf Position in Various Spinach Cultivars." HortScience 29, no. 9 (1994): 1019–21. http://dx.doi.org/10.21273/hortsci.29.9.1019.

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A negative relationship has been reported between the oxalate concentration in leaves and leaf position numbered from the base for `Okame' spinach (Spinacia oleracea L.). We compared changes in leaf and stem oxalate concentrations among three cultivars. `Viroflay' differentiated and developed leaves at a lower rate than did `Okame' and `Kyoho'. Oxalate concentrations in plant tops decreased with time in `Okame' and `Kyoho', but `Viroflay' changed little. The relationship between leaf oxalate concentration (Y; millimoles per gram of fresh weight) and its position on the stem (X) was the same fo

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Lagiman, Lagiman, and Bambang Supriyanta. "Morphological Characterization of Ten Genotipes of Large Chili (Capsicum Annuum L)." RSF Conference Series: Engineering and Technology 1, no. 1 (2021): 54–58. http://dx.doi.org/10.31098/cset.v1i1.336.

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Chili (Capsicum annuum L.) is one of the horticultural commodities that have high economic value which is used as vegetables or cooking spices, industrial raw materials, and has export opportunities. The development of superior chili varieties requires a large variety of germplasm that can be used as parents to be crossed with each other to obtain new superior traits. One of the efforts to determine the diversity of plants is to characterize the morphology and production. The purpose of this study was to obtain distinguishing characters among ten genotypes of large chilies, to determine the va

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Sirvydas, Algimantas Povilas, Vidmantas Kucinskas, Paulius Kerpauskas та Juratė Nadzeikienė. "THEORETICAL MODELING OF TEMPERATURE PULSATIONS IN PLANT LEAF WHICH ARE CAUSED BY LEAF SWING WITH RESPECT TO THE SUN / LOKALIŲ AUGALO TEMPERATŪROS PULSACIJŲ, KURIAS SUKELIA LAPO SVYRAVIMAI SAULĖS ATŽVILGIU, TEORINIS MODELIAVIMAS / ТЕОРЕТИЧЕСКОЕ МОДЕЛИРОВАНИЕ ЛОКАЛЬНЫХ ПУЛЬСАЦИЙ ТЕМПЕРАТУРЫ,ВЫЗЫВАЕМЫХ КОЛЕБАНИЕМ ЛИСТ AРАСТЕНИЯО ТНОСИТЕЛЬНО CОЛНЦА". Journal of Environmental Engineering and Landscape Management 19, № 3 (2011): 251–59. http://dx.doi.org/10.3846/16486897.2011.606174.

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The plant leaf temperature is a result of biological processes occurring in an organ of the plant and its energy exchange with the environment. The plant leaf temperature always differs from the ambient temperature except for the moments of transition from a positive to a negative (or vice versa) temperature gradient. It is determined that the plant leaf temperature continuously changes during the sunny time of the day. Temperature pulsations emerge in plant tissues when the leaf naturally changes its position with respect to the Sun (e.g. impacted by the wind) during the sunny period of the d

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Wright, Ian J., Michelle R. Leishman, Cassia Read, and Mark Westoby. "Gradients of light availability and leaf traits with leaf age and canopy position in 28 Australian shrubs and trees." Functional Plant Biology 33, no. 5 (2006): 407. http://dx.doi.org/10.1071/fp05319.

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Light availability generally decreases vertically downwards through plant canopies. According to optimisation theory, in order to maximise canopy photosynthesis plants should allocate leaf nitrogen per area (Narea) in parallel with vertical light gradients, and leaf mass per area (LMA) and leaf angles should decrease down through the canopy also. Many species show trends consistent with these predictions, although these are never as steep as predicted. Most studies of canopy gradients in leaf traits have concerned tall herbaceous vegetation or forest trees. But do evergreen species from open h

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Ishimaru, Ken, Makoto Kosone, Haruto Sasaki, and Takayuki Kashiwagi. "Leaf contents differ depending on the position in a rice leaf sheath during sink–source transition." Plant Physiology and Biochemistry 42, no. 11 (2004): 855–60. http://dx.doi.org/10.1016/j.plaphy.2004.10.008.

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Caplan, Deron, Jonathan Stemeroff, Mike Dixon, and Youbin Zheng. "Vegetative propagation of cannabis by stem cuttings: effects of leaf number, cutting position, rooting hormone, and leaf tip removal." Canadian Journal of Plant Science 98, no. 5 (2018): 1126–32. http://dx.doi.org/10.1139/cjps-2018-0038.

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This study evaluated the influence of several factors and their interactive effects on the propagation success of stem cuttings of cannabis (Cannabis sativa L.). Factors included (i) leaf number (two or three), (ii) leaf tip removal (one-third of leaf tips removed), (iii) basal/apical position of stem cutting on the stock plant, and (iv) rooting hormone [0.2% indole-3-butyric (IBA) acid gel or 0.2% willow (Salix alba L.) extract gel]. Cuttings were placed in a growth chamber for twelve days and then assessed on their rooting success rate and root quality using a relative root quality scale. Th

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Lanari, Vania, Oriana Silvestroni, Alberto Palliotti, Alan Green, and Paolo Sabbatini. "Plant and Leaf Physiological Responses to Water Stress in Potted ‘Vignoles’ Grapevine." HortScience 50, no. 10 (2015): 1492–97. http://dx.doi.org/10.21273/hortsci.50.10.1492.

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Several studies have investigated water relationships in grapevines, but the responses to water limitation on individual leaves developed in different shoot positions are scarce in the literature. To begin to fill-in this gap, we examined the adaptive responses of vines at the leaf level to varying amounts of water stress using young hybrid ‘Vignoles’ in a controlled growth chamber. We found that the reduction in water availability to 40% of daily evapotranspiration limited shoot and leaf growth, affecting leaf number, shoot elongation, and leaf area. After 2 days of water stress we observed y

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Lati, Ran Nisim, Sagi Filin, and Hanan Eizenberg. "Robust Methods for Measurement of Leaf-Cover Area and Biomass from Image Data." Weed Science 59, no. 2 (2011): 276–84. http://dx.doi.org/10.1614/ws-d-10-00054.1.

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Leaf-cover area is a widely required plant development parameter for predictive models of weed growth and competition. Its assessment is performed either manually, which is labor intensive, or via visual inspection, which provides biased results. In contrast, digital image processing enables a high level of automation, thereby offering an attractive means for estimating vegetative leaf-cover area. Nonetheless, image-driven analysis is greatly affected by illumination conditions and camera position at the time of imaging and therefore may introduce bias into the analysis. Addressing both of the

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Gonzalez‐Real, M. M., and A. Baille. "Changes in leaf photosynthetic parameters with leaf position and nitrogen content within a rose plant canopy (Rosa hybrida)." Plant, Cell & Environment 23, no. 4 (2000): 351–63. http://dx.doi.org/10.1046/j.1365-3040.2000.00559.x.

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LIN, Jiao, Jing-Cheng XU, Lu-Lu MA, et al. "Establish real-time monitoring models of cotton aphid quantity based on different leaf positions in cotton seedlings." Notulae Botanicae Horti Agrobotanici Cluj-Napoca 49, no. 1 (2021): 12163. http://dx.doi.org/10.15835/nbha49112163.

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Cotton aphids, Aphis gossypii glover, are major pest threats to cotton plants, leading to quality and yield loss of cotton. Rapid and accurate evaluation on the occurrence and quantity of cotton aphids can help precision management and treatment of cotton aphids. The occurrence rules of cotton aphids on different leaf positions in cotton seedling stage for two cultivars of cotton were studied. The quantity of cotton aphids in the whole cotton seedlings were predicted based on the single leaf cotton aphid quantity. The correlation analysis results showed that cotton aphids of single leaf were s

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Respita, Intan Annisa, Sandra Arifin Aziz, and Ani Kurniawati. "Correlation of Leaf NPK and Leaf Pigments of Coleus atropurpureus L. Benth during Vegetative and Generative Phases." Journal of Tropical Crop Science 6, no. 03 (2019): 174–81. http://dx.doi.org/10.29244/jtcs.6.03.174-181.

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   Coleus atropurpureus L. Benth is a annual plant that has a distinctive leaf aroma and bitter taste. C. atropurpureus leaves contain phenolic compounds and antioxidants that can capture free radicals; free radicals play an important role in preventing various human diseases. A study was conducted to determine the correlation between leaf position (1st to 4th) at the vegetative and generative phases with leaf pigments, N, P, K, and total flavonoid concentrations. The results showed that leaf chlorophyll a, chlorophyll b, total chlorophyll, carotenoid, anthocyanin, nitrogen,

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Baranoski, G. V. G., and J. G. Rokne. "A practical approach for estimating the red edge position of plant leaf reflectance." International Journal of Remote Sensing 26, no. 3 (2005): 503–21. http://dx.doi.org/10.1080/01431160512331314029.

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JENNINGS, D. M., B. V. FORD-LLOYD, and G. M. BUTLER. "Effect of plant age, leaf position and leaf segment on infection of leek by leek rust, Puccinia allii." Plant Pathology 39, no. 4 (1990): 591–97. http://dx.doi.org/10.1111/j.1365-3059.1990.tb02538.x.

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Guo, Xuchen, Yiwen Zheng, Yuanmiao Chen, Zhidong Zhou, and Jianhui Xue. "Intra-Plant Variation in Leaf Dry Mass per Area (LMA): Effects of Leaf–Shoot Orientation and Vertical Position on Dry Mass and Area Scaling." Forests 16, no. 5 (2025): 724. https://doi.org/10.3390/f16050724.

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The intra-plant plasticity of leaves plays a vital role in enabling plants to adapt to changing climatic conditions. However, limited research has investigated the extent of intra-plant leaf trait variation and leaf biomass allocation strategies in herbaceous plants. To address this gap, we collected a total of 1746 leaves from 217 Lamium barbatum Siebold and Zucc. plants and measured their leaf dry mass (M) and leaf area (A). Leaves were categorized by vertical position (upper vs. lower canopy layer) and leaf–shoot orientation (east, south, west, north). ANOVA with Tukey’s HSD test was used t

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Koch, Garance, Gaëlle Rolland, Myriam Dauzat, et al. "Leaf Production and Expansion: A Generalized Response to Drought Stresses from Cells to Whole Leaf Biomass—A Case Study in the Tomato Compound Leaf." Plants 8, no. 10 (2019): 409. http://dx.doi.org/10.3390/plants8100409.

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It is clearly established that there is not a unique response to soil water deficit but that there are as many responses as soil water deficit characteristics: Drought intensity, drought duration, and drought position during plant cycle. For a same soil water deficit, responses can also differ on plant genotype within a same species. In spite of this variability, at least for leaf production and expansion processes, robust tendencies can be extracted from the literature when similar watering regimes are compared. Here, we present response curves and multi-scale dynamics analyses established on

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Shang, Huihui, Panpan Li, Xiaobo Zhang, et al. "The Gain-of-Function Mutation, OsSpl26, Positively Regulates Plant Immunity in Rice." International Journal of Molecular Sciences 23, no. 22 (2022): 14168. http://dx.doi.org/10.3390/ijms232214168.

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Rice spotted-leaf mutants are ideal materials to study the molecular mechanism underlying programmed cell death and disease resistance in plants. LOC_Os07g04820 has previously been identified as the candidate gene responsible for the spotted-leaf phenotype in rice Spotted-leaf 26 (Spl26) mutant. Here, we cloned and validated that LOC_Os07g04820 is the locus controlling the spotted-leaf phenotype of Spl26 by reverse functional complementation and CRISPR/Cas9-mediated knockout of the mutant allele. The recessive wild-type spl26 allele (Oryza sativa spotted-leaf 26, Osspl26) is highly conservativ

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Seleznyova, A. "Effects of Temperature and Leaf Position on Leaf Area Expansion of Kiwifruit (Actinidia deliciosa) Shoots: Development of a Modelling Framework." Annals of Botany 88, no. 4 (2001): 605–15. http://dx.doi.org/10.1006/anbo.2001.1513.

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Davenport, J. R., R. G. Stevens, E. M. Perry, and N. S. Lang. "Leaf Spectral Reflectance for Nondestructive Measurement of Plant Nutrient Status." HortTechnology 15, no. 1 (2005): 31–35. http://dx.doi.org/10.21273/horttech.15.1.0031.

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The ability to monitor plant nutrient status of high value horticultural crops and to adjust seasonal nutrient supply via fertilizer application has economic and environmental benefits. Recent technological advances may enable growers and field consultants to conduct this type of monitoring nondestructively in the future. Using the perennial crop apple (Malus domestica) and the annual crop potato (Solanum tuberosum), a hand-held leaf reflectance meter was used to evaluate leaf nitrogen (N) status throughout the growing season. In potato, this meter showed good correlation with leaf blade N con

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Dunn, Bruce L., and Carla Goad. "Effect of Foliar Nitrogen and Optical Sensor Sampling Method and Location for Determining Ornamental Cabbage Fertility Status." HortScience 50, no. 1 (2015): 74–77. http://dx.doi.org/10.21273/hortsci.50.1.74.

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Leaf nitrogen (N) and contact optical sensor sampling methods vary in the literature. Thus, the objective of this study was to determine the best sampling procedure for correlating leaf N concentration to contact optical sensor readings. To investigate this, fertilizer rates of 0, 5, 10, or 15 g of 16N–9P–12K were applied as a topdress application on ornamental cabbage (Brassica oleracea L.) ‘Tokyo Red’. Soil plant analysis development (SPAD) and atLEAF chlorophyll meters were used every week for 5 weeks starting 30 days after planting. For each pot, SPAD and atLEAF measurements were taken fro

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Simko, Ivan. "Spatio-Temporal Dynamics of Lettuce Metabolome: A Framework for Targeted Nutritional Quality Improvement." Plants 13, no. 23 (2024): 3316. http://dx.doi.org/10.3390/plants13233316.

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Lettuce (Lactuca sativa L.) is a popular leafy vegetable valued for its dietary fiber, antioxidants, and beneficial vitamins. This study presents a comprehensive spatio-temporal analysis of the lettuce metabolome, revealing complex dynamics in metabolite accumulation influenced by plant age, leaf position, proximodistal distribution within a leaf, and head closure. Samples were collected from plants at five maturity stages (ranging from baby leaf to full commercial maturity and eventually to bolting) and from five leaf positions (from the apex to the base of each plant). A widely targeted meta

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Horel, Ágota, and Tibor Zsigmond. "Plant Growth and Soil Water Content Changes under Different Inter-Row Soil Management Methods in a Sloping Vineyard." Plants 12, no. 7 (2023): 1549. http://dx.doi.org/10.3390/plants12071549.

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The main objective of this study was to investigate soil–plant–water interactions based on field measurements of plant reflectance and soil water content (SWC) in different inter-row managed sloping vineyards. The following three different soil management applications were studied: tilled (T), cover crops (CC), and permanent grass (NT) inter-rows. We measured SWCs within the row and between rows of vines. Each investigated row utilized 7 to 10 measurement points along the slope. Topsoil SWC and temperature, leaf NDVI and chlorophyll concentrations and leaf area index (LAI) were measured every

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Rajendrudu, G., and C. V. Naidu. "Leaf gas exchange capacity in relation to leaf position on the stem in field grown teak (Tectona grandis L.f.)." Photosynthetica 34, no. 1 (1998): 45–55. http://dx.doi.org/10.1023/a:1006859700565.

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Lanari, Vania, Oriana Silvestroni, Alberto Palliotti, and Paolo Sabbatini. "Plant and leaf responses to cycles of water stress and re-watering of ‘Sangiovese’ grapevine." Folia Horticulturae 30, no. 1 (2018): 27–38. http://dx.doi.org/10.2478/fhort-2018-0003.

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Abstract The complex relationship between water and grapevine has been examined in several studies. The aim of this study was to understand the impact of water stress on photosynthesis, carbon-13 discrimination in leaves in different positions on the shoot, and the capacity of vines to recover from different levels of water stress intensity. The vine physiological responses to a water stress regimen followed by re-watering for two consecutive cycles was evaluated using potted ‘Sangiovese’ grapevines. The intensity and the duration of the water limitation affected the emergence and development

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Roggenbuck, Frank C., Richard F. Burow, and Donald Penner. "Relationship of Leaf Position to Herbicide Absorption and Organosilicone Adjuvant Efficacy." Weed Technology 8, no. 3 (1994): 582–85. http://dx.doi.org/10.1017/s0890037x00039725.

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The absorption of14C-bentazon and14C-acifluorfen by individual leaves of velvetleaf was measured from the cotyledons to the most recently developed leaf in plants that had developed seven leaves beyond the cotyledons. Herbicide absorption 1 min after application was greatly enhanced by the organosilicone adjuvant Sylgard 309 explaining previously observed enhanced efficacy and rainfastness by this adjuvant.14C-herbicide absorption was greatest by the cotyledons and decreased upward to the most recently developed leaf. Absorption of the14C-Sylgard 309 was similar to that of the14C-labelled herb

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Reynolds, Gary W., and C. Michael Smith. "Effects of Leaf Position, Leaf Wounding, and Plant Age of Two Soybean Genotypes on Soybean Looper (Lepidoptera: Noctuidae) Growth." Environmental Entomology 14, no. 4 (1985): 475–78. http://dx.doi.org/10.1093/ee/14.4.475.

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Mapegau, Mapegau, Islah Hayati, Addion Nizori, Ardiyaningsih Puji Lestari, and Marlina Marlina. "Pengaruh Posisi Pemangkasan Daun Jagung Dalam Sistem Tumpang Sari Terhadap Pertumbuhan dan Hasil Kedelai." Jurnal Media Pertanian 7, no. 2 (2022): 139. http://dx.doi.org/10.33087/jagro.v7i2.162.

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This study aims to determine the effect of corn leaf pruning on soybean growth and yield in an intercropping system. This research was carried out on farmers' land in Simpang Village, Berbak District, Tanjung Jabung Timur Regency from July - October 2020. This research was carried out using a Randomized Block Design (RBD) with 5 replications. Pruning treatments based on the position of the leaves on the stem were : without pruning (control/p0), pruning 3 leaves at a position near the soil surface (p1), pruning 3 leaves at a position below the cob (p2), and pruning 3 leaves at a position above

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Robertson, Michael J., Graham D. Bonnett, R. Michael Hughes, Russell C. Muchow, and James A. Campbell. "Temperature and leaf area expansion of sugarcane: integration of controlled-environment, field and model studies." Functional Plant Biology 25, no. 7 (1998): 819. http://dx.doi.org/10.1071/pp98042.

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Canopy development is an important determinant of crop radiation interception, and in the absence of stress is mainly driven by temperature. The responses to temperature of the component processes of canopy dynamics in sugarcane: leaf appearance, leaf size, tillering, and leaf senescence, were analysed for the commercial Australian cultivar, Q117. Data were derived under optimal growth conditions from controlled environments, and from irrigated field studies in subtropical and tropical locations. Regression of number of fully-expanded leaves in field-grown plants against cumulative thermal tim

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