Increased capacity of alternative pathway of mitochondrial electron transport in mesophyll protoplasts of pea on exposure to osmotic stress. Kollipara Padmasree, kpssl uohyd. Coordinate regulation of cytochrome and altemative pathway respiration in tobacco. These results suggest that non-enzymatic antioxidants play a significant role over enzymatic-oxidants in regulating cellular ROS during optimization of photosynthesis by AOX. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Characterization of alternative oxidase AOX gene expression in response to methyl salicylate and methyl jasmonate pre-treatment and low temperature in tomatoes. Inhibition of photosynthesis by osmotic stress in pea Pisum sativum mesophyll protoplasts is intensified by chilling or photoinhibitory light; intriguing responses of respiration.
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Intracellular adjustments like alteration in redox status, ROS and antioxidant levels, particularly mediated by mitochondria are essential for plant cells to acclimatize with changing environmental conditions to maintain redox homeostasis Foyer and Noctor,; Baier and Dietz, ; Gechev et al. Characterization of transformed Arabidopsis with altered alternative oxidase levels and analysis of effects on reactive oxygen species in tissue.
Effects of allelochemicals on plant e and oxygen isotope fractionation by the alternative oxidase. Water stress drastically reduces root growth and inulin yield in Cichorium intybus var.
Berkowitz and Gibbs using the system of isolated chloroplasts showed that hyper-osmotic stress caused inactivation of light activated chloroplastic enzymes like RuBisco and fructose-1,6-bisphatase due to acidification of stroma induced by low osmotic potential. The O 2 evolution rates Kluwer Academic Publishers— With decreasing temperature under 0.
Since the AOX mutants of pea are not available, studies using Arabidopsis are required to further understand the underlying molecular mechanisms. Therefore, the decrease in light activation of the enzymes might be responsible for the decreased photosynthetic O 2 evolution rates observed in the present study under stress conditions.
Suggest a Research Topic. Biochemically the malate is oxidized to pyruvate via malic enzyme. These results suggest that non-enzymatic antioxidants play a significant role over enzymatic-oxidants in regulating cellular ROS during optimization of photosynthesis by AOX. Diffusive and metabolic limitations to photosynthesis under 815855 and salinity in C3 plants.
Since the plasma membrane of protoplasts was found to be intact after the short-term hyper-osmotic stress and sub-optimal temperature stress treatments data not shownthe significant decrease in photosynthetic O 2 evolution is considered as a direct effect of stress on photosynthetic performance.
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Taken together, the results indicated the importance of AOX pathway in optimizing photosynthesis under both hyper-osmotic stress and sub-optimal temperatures. Also, it is intriguing to know that the same parameters were found to be crucial in mediating the beneficial interactions between chloroplasts and mitochondria to optimize photosynthetic carbon assimilation under optimal light and CO 2 E and Raghavendra, c ; Dinakar et al.
The electron partitioning between the cytochrome and alternative respiratory pathways during chilling recovery in two cultivars of maize differing in chilling sensitivity.
Osmotic stress affects physiological responses and growth characteristics of three pistachio cultivars. The flexibility of the mitochondrial electron transport chain to divert 8158 from phosphorylating to non-phosphorylating pathways decrease the over reduction of the electron transport chain components and ROS generation.
Reduction—oxidation network for flexible adjustment of cellular metabolism in photoautotrophic cells.
The mitochondrial oxidative electron transport chain in higher plants is branched at ubiquinone, leading to cyanide sensitive cytochrome oxidase COX and cyanide resistant alternative oxidase AOX pathways Millar et al. These results suggest that the changes observed in ROS during hyper- osmotic stress and sub-optimal temperature stress might be involved in signaling function to activate the cellular defense mechanism, perhaps AOX and ROS scavenging antioxidant system Figures 2AB45B and 8.
You can login by using one of your existing accounts. Their results suggested that the increase in AOX pathway activity was due to direct inhibition of the COX pathway activity. Systemic induction and role of mitochondrial 18585 oxidase and nitric oxide in a compatible tomato—tobacco mosaic virus interaction.
Up-regulation of mitochondrial alternative oxidase concomitant with chloroplast over-reduction by excess light. The supernatant was boiled for 1 min and rapidly cooled on ice.
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Equal loading of protein was confirmed by silver staining of a duplicate gel. However, the decrease was more pronounced upon superimposition with SHAM in presence of sub-optimal temperature stress when compared with hyper-osmotic stress Figure 5B. Importance of AOX pathway in optimizing photosynthesis under high light stress: Induction of mitochondrial alternative oxidase in response to a cell signal pathway down-regulating the cytochrome pathway prevents programmed cell death.
Alternative oxidases in Arabidopsis: The present study demonstrates the importance of AOX pathway in optimizing photosynthesis during hyper-osmotic and temperature stress in light.
Further, the light intensity applied to attain maximal rates of photosynthesis is known to vary in mesophyll protoplasts isolated from different leaves Riazunnisa et al. Coordinate regulation of cytochrome and altemative pathway respiration in tobacco.