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 23 for “"light stress"”.
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Mechanisms of selective translational control under short-term high light stress
… stimuli are subject of intensive research. Light in this context takes a special role, since it represents the ultimate source of energy for autotrophic growth. In addition, light-driven photosynthesis is inevitably linked to oxidative stress in a stressful environment, so suitable coping …
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Effect of light stress on the homoiochlorophyllous resurrection plant Craterostigma wilmsii
The effect of light stress during drying, experienced by the homoiochlorophyllous resurrection plant Craterostigma wilmsii, was examined in this study. Inner-whorl leaves, which become shaded from light when dry, and outer-whorl leaves, the abaxial surfaces of which receive light in the dry state, …
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Investigation of mRNA Expression of Early Light Inducible Protein (ELIP) under High Light Stress <em>Arabidopsis thaliana</em>.
<p>Plants absorb light for photosynthesis, but not all is used. Excess light energy may lead to photoinhibition of photosynthesis and irreversible photooxidative damage. Plants have evolved mechanisms for energy dissipation under high light stress. One such response may involve production of …
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The Photoprotective Role of Anthocyanin Pigments in Leaf Tissues
… anthocyanins effectively reduce internal light within the leaf, which may be beneficial under high-light stress conditions. However, pigment patterns in natural systems often appear inconsistent with a photoprotective function (e.g. anthocyanins in abaxial leaf surfaces), and their absence …
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The Ancestry and Function of Cytochrome c6A
… has a signalling role where it could sense high light stress and convey this signal to the nucleus to affect gene expression. This study aims to provide insight into the ancestry and function of cytochrome c6A. To gain a clearer understanding of the evolutionary history of cytochrome c6A and …
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The effect of drying rate on the resurrection species Craterostigma wilmsii (homoiochlorophyllous) and Xerophyta humilis (poikilochlorophyllous)
… in dealing with desiccation and the related light stress. C. wilmsii is homoiochlorophyllous in that it retains its chlorophyll throughout dehydration, while X. humilis, a poikilochlorophyllous resurrection plant, breaks down its photosynthetic apparatus during drying.
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From cradle to grave: The influence of mRNA metabolism on plant stress responses
… and consequently a key regulatory target. During stress, control of mRNA metabolism (and downstream protein production) takes on particular importance due to the energy constraints imposed on the cell. However, the fate of stress-induced mRNAs, particularly with regard to RNA degradation, remains …
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From cradle to grave: The influence of mRNA metabolism on plant stress responses
… and consequently a key regulatory target. During stress, control of mRNA metabolism (and downstream protein production) takes on particular importance due to the energy constraints imposed on the cell. However, the fate of stress-induced mRNAs, particularly with regard to RNA degradation, remains …
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Functional analysis of MYB112 transcription factor in the model plant Arabidopsis thaliana
… parameters including salinity or high light stress may trigger anthocyanin accumulation. In contrast to several other MYB TFs affecting anthocyanin biosynthesis pathway genes, MYB112 expression is not controlled by nitrogen limitation, or carbon excess, but rather is stimulated by …
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Investigating the mechanisms of desiccation tolerance in the resurrection plant, myrothamnus flabellifolius (WELW)
… where they experience regular periods of water stress. Associated with this is light stress. The presence of light under water limiting conditions can result in photo-oxidation which causes damage to plant tissues. M flabellifolius is a homoichlorophyllous plant and thus retains chlorophyll …
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Protection mechanisms against excess light in Myrothamnus flabellifolius (Welw.)
The effects of light stress during drying on excised twigs of the homoiochlorophyllous resurrection plant Myrothamnus flabellifoius, was examined in this study. Leaves were prevented from folding during drying and plants were dried in the light, and as a control, in the dark. The effects on the …
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Transcriptomic study of evolution and gene expression in diploid and allotetraploid glycine subgenus glycine
… the subgenus Glycine following exposure to high light stress. We compared the overall expression of homeologous gene pairs (duplicated genes due to whole genome duplication) with the expression of its homologous genes in its diploid progenitors. We observed that a majority of the genes observed …
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Evaluation of the photoprotective role of quercetin to selected light-adapted and shade-tolerant plant species
Plants respond to different light intensities depending on their genetic make-up, mutation and other environmental conditions. Mikania micrantha, Clidemia hirta, and Tetracera sarmentosa were selected so as to analyse how varying light intensity affects some gas exchange characteristics, pigment …
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Enhancement of Carotenoid Biosynthesis and Antioxidant Responses in Diatoms by Light Modulation
… the antioxidant network in lowering or repairing light stress or damage is poorly understood. <br></br><br></br> My thesis consists of the concomitant investigation of the photoprotective and antioxidant network functioning in the coastal diatom <i>Skeletonema marinoi</i>, and during an experiment …
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The effect of non-glaucousness, as conferred by Inhibitor of Wax 1, on physiology and yield of UK Wheat
… years. A long-term shade trial reducing incoming light by 40 and 60% was also carried out in 2014. Yield, and various physiological components including water use efficiency (WUE) and spectral properties, were measured. Iw1 reduced flag leaf photosynthetically active radiation (PAR) reflectance by …
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Role of xanthophyll and water-water cycles in the protection of photosynthetic apparatus in Arbutus unedo and Arabidopsis thaliana
… out the delicate balance between efficient light harvesting under limited irradiance and regulated energy dissipation under excess irradiance. One of the protective mechanisms is the thermal energy dissipation through the xanthophyll cycle that may transform harmlessly the excitation energy …
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The role of TOR in regulation of Arabidopsis circadian oscillators
… coordinate their biological processes with the light- dark cycles of the Earth. Arabidopsis circadian oscillators are entrained by internal and external cues, including metabolites. Energy limitation lengthens the free-running circadian period of Arabidopsis, which can be restored by exogenous …
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Stabilising Semiconducting Polymers Using Solid State Molecular Additives
… dissertation demonstrates that positive bias and light stress stability can be improved in both p-type diF-TES ADT and IDT-BT organic field effect transistors by incorporating solid state small molecular additives. Simulations predict that the additives improve stability by introducing a …
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The Light and Water Stress Tolerance of Two Invasive Legumes: <I>Cytisus scoparius</I> (Scotch broom) and <I>Spartium junceum</I> (Spanish broom)
… junceum L. to acclimate to different levels of light and water stress was studied to understand ecological constraints on distributions of these plants. A reaction norm experimental design was used to determine growth and physiological responses of each to imposed conditions. Light treatments …
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