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Summary According to gas exchange measurements, mitochondrial oxygen consumption in the light is always fast, while respiratory CO2 evolution is markedly decreased (compared with rates in darkness). We analyze the metabolic events that lead to such contrasting responses. In the light, the generation of NADH in mitochondria, both in the glycine decarboxylase reaction and in the tricarboxylic acid cycle,...
Rates of carbon fluxes and pool sizes of photosynthetic metabolites in different cellular compartments of barley protoplasts were calculated from the time curves of their labeling in the medium of 14 CO 2 . Using membrane filtration procedure, kinetics of 14 C incorporation into the products of steady-state photosynthesis was determined separately in chloroplasts, mitochondria...
The MSC16 cucumber (Cucumis sativus L.) mitochondrial mutant was used to study the effect of mitochondrial dysfunction and disturbed subcellular redox state on leaf day/night carbon and nitrogen metabolism. We have shown that the mitochondrial dysfunction in MSC16 plants had no effect on photosynthetic CO2 assimilation, but the concentration of soluble carbohydrates and starch was higher in leaves...
Potato (Solanum tuberosum L. cv. Désirée) plants with an antisense reduction in the P-protein of the glycine decarboxylase complex (GDC) were used to study the interaction between respiration and photorespiration. Mitochondria isolated from transgenic plants had a decreased capacity for glycine oxidation and glycine accumulated in the leaves. Malate consumption increased in leaves of GDC deficient...
Acclimation of 25 °C-grown Arabidopsis thaliana at 5 °C resulted in a marked increase of leaf respiration in darkness (R d ) measured at 5 °C. R d was particularly high in leaves developed at 5 °C. Leaf respiration (non-photorespiratory intracellular decarboxylation) in the light (R l ) also increased during cold acclimation, but less so than did R d . The ratio R ...
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