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Showing 1 to 12 of 12 for “"bundle sheath"”.
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Developmental and Expression Evolution in C3 and C4 Atriplex and their Hybrids
… two photosynthetic cell types, mesophyll and bundle sheath. Mesophyll cells contain phosphoenolpyruvate carboxylase, the primary carbon fixation enzyme, whereas bundle sheath contains Rubisco and houses photosynthetic carbon reduction. I used C3 x C4 Atriplex F1 hybrids and allele-specific …
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Die epigenetische Regulation des C 4 -Syndroms : belichtungsabhängige Chromatinveränderungen am Promotor der Phosphoenolpyruvat Carboxylase aus Mais (Zea mays L.)
… converted to malate and transported into the bundle sheath where it is decarboxylated to pyruvate. The liberated CO2 is available for refixation by ribulose-1,5-bisphosphate carboxylase/oxygenase (RUBISCO) and PEP is recycled from pyruvate in the mesophyll. By this, CO2 is concentrated inside …
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C 3- und C 4-Photosynthese in Mais (Zea mays): das Hüllblatt der weiblichen Infloreszenz als Modellsystem zur Analyse photosynthetischer Genexpression
… of mesophyll cells in between the vascular bundles compared to foliar leaves. Only mesophyll cells in direct contact with bundle sheath cells fix CO2 by the C4 mechanism, whereas mesophyll cells more distant from the vein seemingly use the C3 metabolism. Within this study, the C3 mesophyll …
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Characterising natural genetic variation in dynamic photosynthesis and photoprotection in sorghum
… of photoinhibition on coordination of mesophyll/bundle-sheath cell carboxylation activity. A combined carbon isotope/leaf-level gas exchange system was developed and utilised for real-time measurement of carbon isotope discrimination during photosynthesis in high-intensity steady-state and …
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Energetics of maize C4 physiology under light limiting conditions
… CO2 concentration around Rubisco in the bundle sheath (BS). Maize CCM has two CO2 delivery pathways to the Bundle Sheath (BS) (respectively via malate, MAL or aspartate, ASP); rates of PGA reduction, carbohydrate synthesis and PEP regeneration vary between BS and Mesophyll (M) cells. For …
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The maximum quantum efficiency of CO2 assimilation declines with depth in the canopies of the C4 crops Miscanthus x giganteus and Zea mays
Leakage of CO2 from bundle sheath cells of C4 plants (φ) could limit their productivity. φ is thought to increase at low light in the C4 crop Miscanthus x giganteus (M. x giganteus) (Kromdijk et al., 2008). This should reduce photosynthetic light use efficiency (PLUE) in the lower canopy. Zea mays …
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In situ studies of sugar metabolism in Ricinus communis L. and Saccharum officinarum L.
… results indicate that starch is accumulated in bundle sheath cells and mesophyll cells of virus -infected plants, however, starch can be found only in the bundle-sheath cells of virus-free plants. The in situ hybridization study indicates that the expression of ADP-glucose pyrophosphorylase in …
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Epigenetische Mechanismen zur Regulation der Transkription C 4-typischer Gene in Mais (Zea mays L.)
… are expressed either in the mesophyll or in bundle sheath cells. An impact of DNA methylation on light-dependent or tissue-specific regulation of transcription could not be detected, but a strong correlation of certain histone modifications with the potential to activate genes in specific …
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Engineering a Reverse C4 Photosynthetic Pathway in C3 species Arabidopsis thaliana
… of most transgenes. Although plants carrying bundle sheath genes of the pathway showed no visible phenotypes and those carrying mesophyll genes showed retarded growth, the latter phenotype seemed to be alleviated in F1 crosses containing genes encoding a full reverse NAD-ME C4 pathway. Work is …
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Molecular detection and identification of phytoplasmas in sugarcane in Hawaii, Thailand, Cuba and Near East
… observations under TEM, parenchymatic cells of bundle sheath and mesophyll tissue of affected leaves showed some alterations including accumulations of starch granules, increase plastoglobuli number and size in disorganized chloroplasts. Insect vectors of phytoplasmas are phloem feeders. Thus …
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Stomatal regulation in C4 photosynthesis
… cycle, resulting in reduced carbon flux into the bundle sheath cells, may alter stomatal regulation. The study found that mutant plants had significantly increased operating C<sub>i</sub> compared to control plants. When C<sub>i</sub> was kept the same as the control plants a significant increase …
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Understanding the physiological and molecular basis of chilling tolerance across species of the C4 genera Miscanthus and Spartina
… decarboxylating enzyme. PEP-CK forms PEP in the bundle sheath which is then translocated to the mesophyll, bypassing the need for PPDK, and in turn circumventing low temperature limitation by PPDK. Indeed, previous studies of Spartina from a cool climate have failed to detect PPDK. Chapter 4 …