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 24 for “"leaf gas exchange"”.
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The economic challenge of leaf gas exchange
The exchange of water for carbon dioxide required for photosynthesis in the leaves of vascular plants couples the global terrestrial carbon and water cycles. It also acts as a selection pressure for the plant: on the one hand, gas exchange for photosynthesis is beneficial for survival and growth in …
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The economic challenge of leaf gas exchange
The exchange of water for carbon dioxide required for photosynthesis in the leaves of vascular plants couples the global terrestrial carbon and water cycles. It also acts as a selection pressure for the plant: on the one hand, gas exchange for photosynthesis is beneficial for survival and growth in …
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White apple leafhopper affects apple fruit quality and leaf gas exchange
… damage to apple leaves caused by the white apple leafhopper (WALH), Typhlocyba pomaria McAtee. Feeding holes created by WALH were found in the lower epidermis, with no visual exterior evidence of cell injury to the upper epidermis. The feeding holes were located in areas of the leaf with high …
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Gas exchange characteristics of apple and peach leaves as influenced by European red mite and twospotted spider mite
… leaves. As ERM- and TSM-days increased, apple leaf net photosynthesis (Pn), transpiration (Tr) , and chlorophyll content (TCHL) decreased linearly. TSM was more damaging to apple leaf gas exchange than ERM. Apple water use efficiency (WUE) declined similarly with increasing mite-days for both …
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Measuring the Physiological Effects of Methylobacterium oryzae Foliar Inoculation onto Salt-Stressed Tomatoes grown in a Greenhouse Semi-Hydroponic System
… oryzae </em>impacted chlorophyll fluorescence, leaf-gas exchange parameters, and tomato Brix levels. Salinity did not alter per unit chlorophyll fluorescence parameters, net carbon assimilation, or fruit Brix levels but did decrease stomatal conductance and fruit yield. In Trial 1, inoculation …
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Effect of Water-deficit Stress on Cotton During Reproductive Development
… to drought and the effects of water stress on leaf physiology and metabolism have been extensively documented. However, information is lacking on the effect of water-deficit stress on the cotton flower. It was hypothesized that water-deficit stress would impair gas exchange functions which …
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Effects of elevated atmospheric carbon dioxide concentration and drought on soybean leaf photosynthesis
… drought and atmospheric CO$\sb2$ enrichment on leaf gas exchange. Midday depressions in net leaf photosynthetic CO$\sb2$ exchange rates (Pn) were found in drought-stressed plants and the diurnal changes were mostly stomatal regulated, although accumulated drought stress eventually resulted in …
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Physiological, biochemical and molecular aspects of induced resistance in maize against Bipolaris maydis infection using a zinc-polyphenolic compound and silicon
Maize leaf blight (MLB), caused by the fungus Bipolaris maydis, has great potential to cause considerable losses in the growth and yield of maize. Higher foliar concentration of silicon (Si) or the use of resistance inducers may be promising alternatives for boosting maize resistance against MLB. …
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Temperature dependence of plant photosynthesis and respiration using the Macromolecular Rate Theory (MMRT)
… dependence of key traits that determine leaf carbon balance in C3 plants, using Sunflower as a model system, with emphasis on the photorespiratory CO2 compensation point (Γ*), the rate of CO2 release in the light (DL), the maximal carboxylation capacity (Vcmax), the maximal electron …
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Will Nitrogen fixers benefit from rising Atmospheric CO2? The response of Podalyria Sericea to elevated CO2
… Pa) CO2 partial pressure for 18 months. Growth, leaf 615N and leaf gas exchange was measured to determine whether this N2-fixer could maintain a positive growth response under conditions of high competition. Results revealed a lack of positive growth response to elevated CO2, although far more …
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The impact of heterogeneity in stomatal anatomical characters on stomatal function and physiology in wheat
… differences in stomatal anatomy between the two leaf surfaces a novel gas chamber was constructed to measure separate but simultaneous leaf gas exchange of each leaf surface in real time. The adaxial leaf surface boasted higher SD, higher gs and A compared with the abaxial leaf surface and when …
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Assessment of fruit growth response to water stress in a super-high-density olive orchard: monitoring, physiological mechanisms and potential use to schedule irrigation.
… it, such as the root system distribution, the leaf gas exchange and the water relations between fruits and leaves as well as on the utility of continuous measurements of fruit diameter variations. Therefore, in Chapter 2 we assessed the influence of the increment of drip lines (from one to two …
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The influence of the evolution of anatomical characters on leaf hydraulic capacity
… to have driven evolutionary changes in plant leaf anatomy, enabling plant leaves to adapt to declining atmospheric [CO2] over the last 120 million years. This thesis aimed to study the effect varying anatomical characters had on plant leaf function in different taxa. Atmospheric [CO2] at the …
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The physiological importance of small leaf sizes in the mediterranean type ecosystem vegetation of the Cape floristic region
… layer conductance, which is determined by leaf shape and size, surface modifications and wind speed. We expected fine-leaved species with higher boundary layer conductance to transpire faster than broad-leaved species at low temperatures whereas at higher temperatures we expected …
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Crop traits to improve plant water relations under abiotic stresses
The present dissertation aims to discuss plant ecophysiological, biochemical, and molecular traits that are involved in the tolerance of environmental stresses that affect agricultural production and threat food security: agricultural drought, soil salinity, and nitrogen management. The challenges …
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Effect of Ozone on CO2 Assimilation and PSII Function in Plants with Contrasting Pollutant Sensitivities
… and black cherry (Prunus serotina) were studied. Gas exchange analysis and chlorophyll fluorometry were utilized to characterize physiological function. Two tobacco cultivars, Bel-B and Bel-W3, tolerant and sensitive to ozone, respectively, were grown in a greenhouse supplied with charcoal …
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Study of different soil management techniques to improve the cultivation of the vine and encourage its sustainability
… and population dynamics, vine water status, leaf gas exchange, vegetative growth, yield, phenolic profiles in shoots, leaves, and berry skins, as well as grape and wine quality parameters, including organoleptic assessment. The results indicated that the effects of organic mulching depend on …
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Influencia de la distancia entre filas y de la densidad de pámpanos en el aprovechamiento de los recursos ambientales y en la respuesta del cv. Tempranillo (Vitis vinifera l.), conducido en espaldera con riego deficitario
… en el estado hídrico ni en el intercambio gaseoso de las hojas, entre cuajado y vendimia. Durante la maduración, las plantas con mayor densidad de pámpanos tuvieron potenciales hídricos foliares iguales o más bajos que las plantas con menor número de pámpanos. A pesar de esto, se considera …
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Determining transpiration efficiency of eight grain sorghum lines [Sorghum bicolor (L.) Moench]
… 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] accessions, previously screened for TE and to test physiological mechanisms that may account for differences in TE. Three field studies and two …
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