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 62 for “"photosynthetic efficiency"”.
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A Theoretical Approach to Guiding Biotechnological Improvement of Crop Photosynthetic Efficiency
… to advance identifying targets for higher photosynthetic efficiency. Two approaches have been identified that can substantially increase daily canopy photosynthetic CO2 uptake rate (Ac). Replacement of current C3 crop Rubisco with foreign Rubisco with higher catalytic rates was shown to …
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Characterizing natural genetic variation in photosynthetic efficiency across 44 accessions and five subpopulations of oryza sativa
… has become increasingly imperative. Improving photosynthetic efficiency at the leaf level, especially leaf CO2 uptake (Asat) is an approach to not only bettering crop yields, but also optimizing water and nutrient use efficiency. As the world’s second most cultivated crop, improving …
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Analysis of anther-derived plants of Solanum phureja: variation in ploidy, photosynthetic efficiency and structure of the nuclear genome
The ultimate goal of the· breeding scheme, of which the present study is a part, is to introduce exotic germplasm into existing cultivars of Solanum tuberosum through· 4x X 2x crosses using the South American diploid potato species Solanum phureja as the pollen parent. The first phase of this …
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Analyzing variation in plant canopy conversion efficiency and assessing canopy and leaf photosynthetic efficiency in soybean with reduced chlorophyll content
The conversion efficiency of absorbed radiation into biomass (εc) is a component of yield potential. Unlike other efficiency components of yield potential, εc in C3 and C4 plant groups is estimated to be much lower than the theoretical maxima, signifying that εc limits yield potential but has room …
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Modeling the potential effects of growth reductions and changes in photosynthetic efficiency and needle retention on the stand-level growth of loblolly pine plantations
… consisted of developing a measure of photosynthetic potential to drive diameter and height growth in the model. This new measure was an estimate of foliage weight which was weighted by a factor of photosynthetic efficiency and needle retention for each age class of needles. Reductions …
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Measuring and Comparing Quantum Yield in Two Species of Marine Diatoms Subjected to Constant and Fluctuating Light Conditions
… the effects of light fluctuations on the photosynthetic efficiency of marine phytoplankton. Two species, <em>Phaeodactylum tricornutum </em>and <em>Chaetoceros gracile </em>were grown in specialized photobioreactors on a 12-hour:12-hour light:dark cycle. The cultures were diluted 50% daily …
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Sensitivity of two forest growth models to simulated pollution stress modifications
… through the reduction of the input variables photosynthetic efficiency and average needle retention. Reductions of photosynthetic efficiency included 0, 7.5, and 15 percent, while average needle retention was reduced 0 and 1 year. These reductions were distributed evenly over each of the five …
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The role of arabidopsis UV-resistance locus 8 protein in regulating photosynthetic competence
… other mutants and uvr8-1 had a reduction of its photosynthetic efficiency (measured as Fv/Fm values). Assessments of SIG5 and ELIP1 transcripts and measurements of photosynthetic efficiency showed that these genes are not essential in UV-B protection. Further, transcript measurements of psbA and …
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Characterising natural genetic variation in dynamic photosynthesis and photoprotection in sorghum
… photoprotective processes are key for protecting photosynthetic machinery from excess light energy. Improving the regulation of NPQ in leaves during dynamic light conditions has been identified as a potential route toward increasing photosynthetic efficiency in the world’s most important crops. …
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Physiological Responses of Cotton Genotypes to Water-Deficit Stress during Reproductive Development
… stages would impair stomatal conductance and photosynthetic efficiency of leaves, which consequently would result in osmotic adjustment through accumulation of compatible solutes, increased activity of enzymes, and perturbation of carbohydrates metabolism in leaves and flowers of cotton …
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Rapid measurements of periphytic responses to nutrients using PAM fluorimetry
… fluorometric methods of estimating biomass and photosynthetic activity have been used in saline environments, but generally not over different nutrient treatments and not for a substantial duration. This study evaluated the use of a pulse amplitude modulated (PAM) fluorometer for measuring …
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The effects of low-level pharmaceuticals on stream biofilm structure and function across a land-use gradient in streams of the Huron River watershed
… following treatments. However, maximum photosynthetic efficiency, decomposition, and microbial physiological profiles showed no significant effect of PPCPs. Still, changes in bacterial activity and composition suggest that PPCPs may act as ecological disruptors at low levels, and further …
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Low Temperature Induced Signaling and Molecular Responses in Tomato
… photosynthesis. However, plants can regain their photosynthetic efficiency during a recovery period at warm temperature, low light and high humidity. The mechanism by which plants sense the signal of temperature change and eventually show a response remains unknown. A putative model for the …
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An integrated plant nutrition system (IPNS) for corn and cannabis in the Mid-Atlantic USA
… more sustainable cultivation systems with higher efficiency of input use, since mineral nutrient losses due to runoff, leaching, erosion and gas emissions are leading to environmental degradation. A huge variety of materials can serve as a crop nutrient supply and they can be derived from …
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Sustainable Approaches to Enhance Water Productivity in Cucumis melo
… production by reducing plant growth, photosynthetic efficiency, and yield. Sustainable strategies such as grafting, deficit irrigation, and an improved understanding of plant-water relations offer potential solutions to enhance crop water productivity (CWP). This study conducted at the …
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The role of guard cell chloroplasts in stomatal function and coordinating stomatal and mesophyll responses .
… leading to ultimate plant water use efficiency (WUE). Climate change is predicted to lead to greater temperatures and reduced water availability resulting in adverse effect on plant productivity. Sustainable agriculture will therefore require a major reduction in plant water use hence …
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Influence of timing of nitrogen application on yield and nutrient uptake of winter wheat (Triticum aestivum L.)
… split applications were attributed to greater photosynthetic efficiency in lower tiller densities of head-bearing tillers. Split N applications also improved the nitrogen and phosphorous economy of winter wheat, which is shown by increases in the nitrogen and phosphorous harvest indices for …
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INTEGRATIVE MODELLING FOR THE CHARACTERISATION OF THE STRUCTURE AND DYNAMICS OF BIOMOLECULES
… crop breeding strategies aimed at improving photosynthetic efficiency.
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Growth, photophysiology and photosynthesis of two marine diatoms grown under predictable intra-diel light fluctuations
… P. tricornutum suggested that differences in the photosynthetic efficiency of light utilisation were a poor explanation for the lower growth rates in LF cultures. Lower growth rate under fluctuating light was instead hypothesised to be caused by greater photodamage and energy investment in …
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