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 19 of 19 for “"Plant Water Status"”.
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Interaction of spatial variability characterized by soil electrical conductivity and plant water status related to generative growth of fruit trees
… Wassernutzungseffizienz (WUEc) und des crop water stress index (CWSI) bezogen auf die Fruchtqualität sowie (iii) eine Möglichkeit zur Einteilung von einzelnen Bäumen hinsichtlich der Bewässerung. Dazu fanden die Hauptuntersuchungen in der Pflaumenanlage statt. Diese Obstanlage befindet sich …
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Physiological studies of in vivo and in vitro water requirements and water relations of Chrysanthemum morifolium Ramat
… Ramat. showed a significant reduction in plant water status under both sunny and cloudy conditions in response to depriving them of water. Water potential, osmotic potential, and pressure potential proved appropriate parameters for indicating plant water status. Diurnal changes in water …
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Foliar Herbivory on Understory Oaks as a Function of Forest Type and Prescribed Burning
… addition, I qualitatively related leaf loss to plant water status, leaf nitrogen (N) concentrations, light, and general environmental conditions. The study took place within the Drury Conservation Area, located in Taney County, Missouri. Study sites representing unburned and burned savanna and …
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The effects of cloud moisture on Restions, Ericas and Proteas in the Cape Floristic region
… that the direct wetting of foliage provides a water subsidy to plants of various ecosystem types. In this study, we investigate the presence of foliar uptake, and the effects of misting on the plant water potential of species representing diverse functional types, namely ericoids, proteoids and …
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Effects of Air vs. Air+Soil Heating During a Simulated Heat Wave on White Oak (Quercus alba) and Black Oak (Quercus velutina)
… heating to air heating can change the overall plant response to heat waves. To investigate air <i>vs.</i> air+soil heating in woody species, we manipulated the temperature of both shoots and roots separately for both white and black oak seedlings by insulating the soil during heat-stress to the …
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DEVELOPMENT OF INNOVATIVE SENSORS FOR DETECTING THE WATER STATUS OF PLANTS IN PRECISION AGRICULTURE APPLICATIONS
… integrated systems for the direct assessment of plant water status, a key parameter in precision agriculture and sustainable irrigation. The thesis is organized into three main experimental parts, each addressing a different level of plant-based monitoring, from direct leaf sensing to whole-plant …
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A multifaceted approach to identifying targets for the improvement of water-use efficiency in Zea mays
… development of more efficient crops. With fresh water resources declining and precipitation patterns becoming more sporadic, severe drought scenarios are becoming a normal occurrence during production seasons. Current methods for quantifying water-use efficiency (WUE) in C4 crops are not able to …
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Coordinated Tree Responses to Drought -Vulnerability and Sustainable Production: Hypotheses on Arid Ecosystem Adjustments to Limitations in Water Resources
… to investigate tree responses to declining soil water content. Field experiments were conducted on naturally growing trees of Acacia tortilis and A. xanthophloea in the savanna region of Kenya and Quercus suber in the Mediterranean region of Portugal. The selected field sites were regions that …
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The effect of timing of growing season drought on flowering of Andropogon gerardii
… of flowering stalks. Growth rate, leaf water potential and carbon assimilation of A. gerardii were all most sensitive to drought late in the growing season, suggesting that growth regulation in response to plant water status, not current year’s carbon accumulation is the critical factor …
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A study of salt tolerance in Arabidopsis thaliana and Hordeum vulgare
… processes in salt tolerant and salt sensitive plants cells to gain insight into the mechanisms that confer halotolerance. Halotolerant and salt sensitive cell lines were derived from the model glycophyte Arabidopsis thaliana; in addition cell suspension cultures from the dicot halophytes Beta …
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Physiological responses of sun and shade foliage in thinned and unthinned ten-year-old loblolly pine stands
… lower (shade) crown foliage were examined. Xylem water potential, litterfall dynamics and tree growth were monitored. Nutrient availability, chlorophyll content and chlorophyll a/b ratio were assessed. At the end of the third post-thinning growing season (eleventh season since planting), thinned …
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A physiological basis to crop improvement and agronomic development
… partitioning through additional reductions in plant height is not likely; as comparative studies indicate that wheat yield is reduced when plants are shortened beyond a threshold, and most of the modern cultivars have reached the optimal height. Therefore, this dissertation aimed to identify …
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Unlocking the genetic potential of the root system, rhizosheath mucilage and microbiome of wheat (Triticum aestivum L.)
… wheat root system is a crucial determinant of plant performance, yet roots are overlooked in breeding due to the challenge of studying organs below ground. Evidence from the literature indicate that water and nutrient uptake are often suboptimal in high yielding and stressed environments. …
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Interactive effects of elevated carbon dioxide concentration and water availability on field-grown soybean (Glycine max)
… Elevated atmospheric [CO2] directly affects C3 plants by reducing stomatal conductance (gs) and increasing photosynthetic carbon assimilation (A). It is widely hypothesized that reduced gs in elevated [CO2] will decrease plant and canopy water use, conserving soil moisture and ameliorating …
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Using spectral signatures as a toolbox for determining crop health status
… allow for rapid, non-invasive probing of plant and crop performance, and have potential to overcome current phenotyping bottlenecks for breeders and researchers while enabling farmers to optimise the inputs of fertilizer, irrigation and pesticides on their crops to maximise yields and …
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Consequences of drought, flooding, and insect herbivory on the distributions of closely related willow and poplar (Salicaceae) species across hydrologic gradients in Minnesota wetlands
… showed differential distributions across a water table depth gradient, suggesting environmental filtering mediated by water stresses likely caused habitat segregation among species. Furthermore, species in the Salicaceae family are known to host a variety of insect herbivores, which makes …
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Impacts of heat waves on food quantity and quality of soy bean/corn in the Midwest at ambient and elevated [CO2]
… significant impacts on managed and unmanaged plant productivity. Yet, current studies of the effects of heat waves on crops are confined to post-mortem and historical analyses. There are no field based heat wave studies on major crops. In the past decade, the development of efficient infrared …