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 28 for “"Relative water content"”.
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Effect of nitrogen fertilization on the physiological damage and subsequent recovery of mite-infested apple leaves
… Pn rates. Transpiration, dark respiration, relative water content, leaf nitrogen, and total chlorophyll were negatively related to MD, but specific leaf weight was positively related to MD. No interaction was found between N treatment and mite feeding for these parameters. Following removal …
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Comparisons of the resurrection grass, Eragrostis nindensis, with the related desiccation-sensitive species, E. curvula
… Both E. nindensis and E. curvula dehydrate to a relative water content (RWC) ofless than 5% in two weeks. Photosynthetic activity in E. curvula is maintained down to 40% RWC, after which further drying results in a sudden irreversible breakdown of the photosynthetic system and its pigments.
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Comparisons of the resurrection grass, Eragrostis nindensis, with the related desiccation-sensitive species, E. curvula
… Both E. nindensis and E. curvula dehydrate to a relative water content (RWC) ofless than 5% in two weeks. Photosynthetic activity in E. curvula is maintained down to 40% RWC, after which further drying results in a sudden irreversible breakdown of the photosynthetic system and its pigments.
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The combined effects of fertilization and relative water limitation on tissue water relations, hydraulic parameters and shallow root distribution in loblolly pine (Pinus taeda L.)
… limitation resulted in changes to shoot tissue water relations parameters classically characterized in drought response studies. More severe water limitation was necessary to elicit responses, and those responses had not been fully described previously. The more severe water limitation resulted …
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Physiological responses of common bean(Phaseolus vulgaris L.)genotypes to water stress
… (Phaseolus vulgaris L.) is highly constrained by water deficit especially occurring during the reproductive development which significantly reduces the grain yield. A late planted crop, is likely to experience water stress. The purpose of the study was to determine the association of the …
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Physiological responses of common bean(Phaseolus vulgaris L.)genotypes to water stress
… (Phaseolus vulgaris L.) is highly constrained by water deficit especially occurring during the reproductive development which significantly reduces the grain yield. A late planted crop, is likely to experience water stress. The purpose of the study was to determine the association of the …
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MORPHO-PHYSIOLOGICAL EVALUATIONS OF ALEPPO AND BRUTIA PINE SEEDLINGS UNDER TWO DIFFERENT MOISTURE REGIMES (SYRIA, AFFORESTATION, CHLOROPLASTS).
… was found to contain chloroplasts exhibiting water stress-related damage at a relative water content of 62 percent, where as Brutia pine chloroplasts were disrupted. It is suggested that future investigations examine the physiological manifestation of drought mechanism at the cellular and …
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Glucose dynamics in rat skeletal muscle : recovery from osmotic stress
… recovery media and analyzed for metabolite content and glycogen synthase percent activation. To determine glucose uptake during iso-osmotic recovery, muscles (n=6 per group) were incubated for sixty minutes in either hypo-, iso-, or hyper-osmotic media immediately followed by five minutes of …
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Determining transpiration efficiency of eight grain sorghum lines [Sorghum bicolor (L.) Moench]
… is defined as total biomass produced per unit of water transpired. Improvement of TE means maximizing crop production per unit of water used. The objectives of the study were to examine, at the leaf level and the whole plant level, the variation in TE for sorghum [Sorghum bicolor (L.) Moench] …
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Physiological variation of Garry oak (Quercus garryana) seedlings to drought stress
… and severe drought stress induced by withholding water. The most extreme differences in photosynthetic characteristics for non-stressed seedlings from different populations were in stomatal conductance rates, which in some cases differed between populations by 2 fold or more. Differences in …
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Gene expression associated with drought tolerance in Xerophyta viscosa Baker
… can tolerate extremes of dessication. Upon rewatering, it rehydrates completely and assumes its full physiological activities. Studies on changes in gene expression associated with dehydration stress tolerance were conducted. A cDNA library constructed from m RNA isolated from dehydrated (85%, …
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Accuracy of Heat-Pulse Sensors for Determining Moisture of Capillary Mat Material Used to Support Plant Growth
… mat surrounding a bare porous tube used for water delivery. Sensors and plants will be attached to the capillary mat, which transports water by capillary action. The TMAS sensors, single probe heat-pulse moisture sensors, will measure the moisture level of the capillary mat as part of a …
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Desiccation-driven senescence in the resurrection plant Xerophyta schlechteri (Baker) N.L. Menezes
… transcriptional changes in ST and NST at varying water contents during desiccation and rehydration. Light and transmission electron microscopy was used to follow anatomical and subcellular responses, and metabolic differences were studied using gas chromatography-mass spectrometry and colorimetric …
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High temperature stress responses of Salvia splendens and Viola X wittrockiana
… with increased gas exchange rates, leaf relative water content and overall marketable quality in salvia. These simple laboratory techniques to test heat tolerance have a greater advantage over time and space consuming field trials and may be an accurate and more efficient measure of heat …
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DEVELOPMENT OF INNOVATIVE SENSORS FOR DETECTING THE WATER STATUS OF PLANTS IN PRECISION AGRICULTURE APPLICATIONS
… 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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NAC transcription factors in sugarcane and their functional role in drought tolerance
… biomass productivity but marked sensitivity to water deficit. It is cultivated in many countries, including South Africa, where drought severity and frequency are expected to increase in the coming decades. This underscores the need for genetic engineering strategies to enhance drought tolerance …
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Terahertz spectroscopy to explore the role of vibrational dynamics in systems with varying structural order and disorder
… formers. Degradation mechanisms catalysed by water clusters, the influence of the solvation shell in solution upon reconstitution, and crystallisation processes are important aspects to consider in this context, and this thesis investigates these points using terahertz time-domain spectroscopy …
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Water relations and cutting management of switchgrass
… two successive drought cycles on performance and water relation parameters of switchgrass and tall fescue were studied in growth chamber conditions. Water was withheld from conditioned plants until elongation of tillers stopped. Then pots were rewatered and a new drought cycle followed. Control …
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Thermo and drought tolerance markers and regulation of heat stress proteins for chickpea (Cicer arietinum L.; Fabaceae) production in NE South Africa
… were divided into three groups, non-stressed (watered to 75% field capacity (FC), severe water stress (moisture-withholding for 14 days) and treated to 40% FC throughout the experiment (mild-stress), with recovery for the severely stressed plants after which they were stressed (double-stress) …
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Using spectral signatures as a toolbox for determining crop health status
… of plants due to variation in chlorophyll content. Increasing the accessibility of NDVI imaging systems through the development of a small, low cost, and easy to use imaging system has potential to increase the uptake of NDVI imaging systems, especially amongst farmers and breeders. We …
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