Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Leaf expansion"”.
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A phytomer-based simulation model for growth in competitive weed-crop systems
… phenology and vertical distribution of leaf area in competitive weed-crop systems was developed. The model was based on (1) a temperature function for leaf appearance rate (2) a function for individual leaf expansion based on leaf appearance (3) a function for elongation of individual …
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Ultrastructural cytology of peanut infected with peanut stripe virus
… hypogaea L. 'Florigiant') at several stages of leaf expansion. Ultrathin sections of young leaves infected with either isolate of PStV revealed pinwheel inclusions attached to the cell wall near plasmodesmata. The cytoplasm of infected cells were highly vesiculated. Virus particles amassed in …
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Management and Interference Potential of Common Waterhemp (Amaranthus Rudis) in Soybean (Glycine Max)
… interference 2 weeks after soybean unifoliolate expansion resulted in soybean seed yield equivalent to a season-long weed free control, but delaying common waterhemp removal longer than 2 weeks resulted in decreased soybean seed yield. Full season common waterhemp interference reduced soybean …
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Effects of defoliation on the cultivated strawberry (Fragaria X ananassa Duch.)
… net photosynthesis (Pn) concurrently with full leaf expansion at approximately 8 to l0 days and 4 to 5 days, respectively, after unfolding. By exposing the plants to increasing irradiance it was determined that these cultivars were light saturated at 600 to 700)Ï molâ ¢m⁻²s⁻¹. Neither cultivar …
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Photosynthesis and certain morphological characteristics of alfalfa as affected by potassium nutrition
… assumed that K contributed either to increased leaf expansion, thereby resulting in a larger photosynthetic surface, or to higher CO₂ assimilation rates per unit leaf area. Sand culture technique for growing plants was used in two greenhouse experiments, while field plants were grown in plots …
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A crop phenology model for Windows
… soil water content, crop or weed leaf expansion, internode development, crop flowering, and other vegetative and reproductive growth processes. Water stress effects are simulated using different irrigation schedules. The model serves as a generic crop and weed phenology model via …
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Differential Canopy Leaf Flushing and Site Nitrogen Status Facilitate Invasive Species Establishment in Temperate Deciduous Forest Understories
… because of phenological differences in spring leafing as well as canopy transmission and site-nutrient availability in these understories. Six canopy types were used: <em>Populus tremuloides</em> (quaking aspen), <em>Acer saccharum </em>(sugar maple), <em>Quercus </em>spp./<em>Carya </em>spp. …
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Characterization of KPAP, a Novel Pokeweed Antiviral Protein Isoform
… carbon metabolism, plant growth or leaf expansion. Structurally the predicted protein was docked in silico to an adenine base and showed a similar disposition of the active site compared to PAP-I. Lastly, KPAP was docked in silico to the E.coli SRL and residue interactions are …
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Development of a crop model to examine crop management and climate change in Senegal
… features were implemented including a new leaf expansion methodology, semi-independent tillers, stress-dependent partitioning, and intercropping. CROMSAS was designed in a structured, accessible way to facilitate the use of the model by other researchers who want to examine climate change …
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Coordinated Tree Responses to Drought -Vulnerability and Sustainable Production: Hypotheses on Arid Ecosystem Adjustments to Limitations in Water Resources
… plant water status, growth, sap flux density, leaf transpiration and stomatal conductance, tissue water relations and isotope labeling. Similar measurements were conducted on plants growing in the greenhouse. Also examined in the greenhouse were root biomass, root structure as well as whole …
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Purple nutsedge (Cyperus rotundus L.) competition with cotton: Species biology and effects of proportion, density, and moisture
… maintain higher RGR (relative growth rate), LAR (leaf area ratio), and leaf expansion than nutsedge. Absolute growth rate (AGR), initial propagule weight, and early shoot production were important parameters for purple nutsedge competition with cotton. Moisture stress affected the relative …
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Bud-forcing and in vitro culture for conservation of oak (Quercus L.)
… when grouped by section. Growth responses of leaf expansion, bud expansion, shoot production, and callus production were observed in nine of the species. Explants grown on WP/MS media had significantly more growth responses and longer survival times than those on GD media.
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Investigation of phototropin blue light receptor function and signalling in arabidopsis
… blue light-induced stomatal opening, leaf expansion and leaf movements can be induced through the activation of both phot1 and phot2 in response to different intensities of light, with phot1 being more light sensitive than phot2. In addition to the functionally redundant responses, …
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Identification of growth-related tonoplast proteins in Arabidopsis thaliana
In a very simplified view, the plant leaf growth can be reduced to two processes, cell division and cell expansion, accompanied by expansion of their surrounding cell walls. The vacuole, as being the largest compartment of the plant cell, plays a major role in controlling the water balance of the …
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Evaluation and improvement of CERES-Maize evapotranspiration simulations under full and limited irrigation treatments in northern Colorado
… many aspects of crop growth, including yield, leaf area index, leaf growth, and phenology. The model performed better overall for the full irrigation treatment than the limited irrigation treatment. The model underestimated treatment differences in cumulative ET between treatments, simulating …
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Light-emitting diodes as an alternative supplemental lighting source for greenhouse tomato propagation and production
… thereby increasing available<em>PAR</em> at leaf level using less input power than HPS lamps. In addition, unlike traditional light sources used in commercial greenhouses today, LEDs are solid state, robust, long-lasting, and can be designed to emit narrow-band wavelengths that can be …
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Growth of pasture species in the shade in relation to alder silvo-pastoral systems : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy (Ph.D.) in Pastoral Science, Institute of Natural Resources at Massey University, New Zealand
… Wana cocksfoot and 24-27 for PG 74 cocksfoot. Leaf area per plant for perennial ryegrass was also significantly (P<0.0001) lower than for Wana cocksfoot. Cocksfoot selections were more tolerant of heavy shade than perennial ryegrass, and Wana was the most tolerant of the cocksfoot selections of …
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Effect of temperature and daylength on the phenological development of oats (Avena sativa L.)
… on the co-ordinated processes of initiation and expansion of leaves and floral structures on the main shoot apex. To compare both approaches, phenological events of field grown oat crops, and the number of leaves and floral structures initiated and expanded on the main shoot apex were recorded …
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Physiological responses of soybean seeds (Glycine Max L. Merr.) to metal pollutants
… Both Cd and Ni accelerated plant senescence. Leaf abscission was promoted and in the case of the older growth stages, the rate of pod development was increased relative to that of control pods. Nonetheless, the presence of metal pollutants did not appear to enhance pod abscission during the …