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• W2017696613 abstract "Photorespiration (glycolate metabolism) has been studied in isolated mesophyll cells and bundle sheath from crabgrass leaves and in mesophyll cells from spinach leaves. In these preparations the specific activity was determined for the glycolate pathway enzymes and the amount of CO2 evolved and O2 taken up from glycolate and glycine fed to each cell type was measured. With crabgrass and spinach all enzymes of the glycolate pathway were found in extracts from mesophyll cells or from bundle sheath cells. However, in crabgrass, the specific activity of glycolate oxidase, catalase, glyoxylate-glutamate aminotransferase, hydroxypyruvate reductase, and 3-phosphoglycerate phosphatase was three- to fivefold higher in the bundle sheath cells than in the mesophyll cells. The glycolate pathway enzymes in crabgrass were about one-fifth as active as in spinach, except for 3-phosphoglycerate phosphatase which was higher in crabgrass. Spinach cells evolved fivefold more CO2 than bundle sheath cells of crabgrass when fed glycolate or glycine. With crabgrass the isolated bundle sheath cells evolved CO2 about five times faster than mesophyll cells. With crabgrass and Bermudagrass the number of peroxisome, chloroplast, and mitochondrion profiles in electron micrographs of leaf cross sections were counted and in mesophyll cells the number of peroxisomes is only about one third of that in the bundle sheath cells. Key C4-cycle enzymes, such as phosphoenolpyruvate carboxylase, and NADPH malate dehydrogenase, were predominantly in the mesophyll cells of crabgrass. In crabgrass leaf cells the amount of CO2 fixed in the presence of an exogenous substrate, phosphoenolpyruvate, by mesophyll cells is equal to that evolved by bundle sheath cells fed glycolate. When isolated spinach mesophyll cells or crabgrass bundle sheath cells were fed glycolate in the dark an anomalous stoichiometry of O2 uptake to CO2 evolution of 10:1 was measured. It is concluded that in leaves of crabgrass and other C4 plants the apparent lack of photorespiration is due to the ability of the active C4-cycle enzymes in the mesophyll cells to assimilate all of the CO2 released, which may come primarily from the bundle sheath cells, plus the unique spatial arrangement inside of C4 plant leaves in which 70–80% of the organelles and the enzymes involved in photorespiration are localized in the bundle sheath cells." @default.
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• W2017696613 date "1972-03-01" @default.
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• W2017696613 title "Glycolate metabolism in mesophyll cells and bundle sheath cells isolated from crabgrass, Digitaria sanguinalis (L.) scop., leaves" @default.
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• W2017696613 doi "https://doi.org/10.1016/0003-9861(72)90322-0" @default.
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