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Distribution of photorespiratory enzymes between bundle-sheath and mesophyll cells in leaves of the C3−C4 intermediate species Moricandia arvensis (L.) DC

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In order to study the location of enzymes of photorespiration in leaves of the C3−C4 intermediate species Moricandia arvensis (L.). DC, protoplast fractions enriched in mesophyll or bundlesheath cells have been prepared by a combination of mechanical and enzymic techniques. The activities of the mitochondrial enzymes fumarase (EC and glycine decarboxylase (EC were enriched by 3.0- and 7.5-fold, respectively, in the bundle-sheath relative to the mesophyll fraction. Enrichment of fumarase is consistent with the larger number of mitochondria in bundle-sheath cells relative to mesophyll cells. The greater enrichment of glycine decarboxylase indicates that the activity is considerably higher on a mitochondrial basis in bundle-sheath than in mesophyll cells. Serine hydroxymethyltransferase (EC activity was enriched by 5.3-fold and glutamate-dependent glyoxylate-aminotransferase (EC activity by 2.6-fold in the bundle-sheath relative to the mesophyll fraction. Activities of serine- and alanine-dependent glyoxylate aminotransferase (EC and EC, glycollate oxidase (EC, hydroxypyruvate reductase (EC, glutamine synthetase (EC and phosphoribulokinase (EC were not significantly different in the two fractions. These data provide further independent evidence to complement earlier immunocytochemical studies of the distribution of photorespiratory enzymes in the leaves of this species, and indicate that while mesophyll cells of M. arvensis have the capacity to synthesize glycine during photorespiration, they have only a low capacity to metabolize it. We suggest that glycine produced by photorespiratory metabolism in the mesophyll is decarboxylated predominantly by the mitochondria in the bundle sheath.

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Rawsthorne, S., Hylton, C.M., Smith, A.M. et al. Distribution of photorespiratory enzymes between bundle-sheath and mesophyll cells in leaves of the C3−C4 intermediate species Moricandia arvensis (L.) DC. Planta 176, 527–532 (1988).

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