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Metabolism and Enzymology

Repression of the Plastidic Isoenzymes of Aldolase, 3-Phosphoglycerate Kinase, and Triosephosphate Isomerase in the Barley Mutant "albostrians"

Institut für Pflanzenphysiologie und Mikrobiologie, Freie Universität Berlin, D-1000 Berlin 33, Königin-Luise-Strasse 12-16a, Germany, Institut für Genetik, Humboldt-Universität, O-1040 Berlin, Invalidenstrasse 43, Germany

White leaves of the mutant line albostrians and green leaves of the wild-type cultivar Salome of barley (Hordeum vulgare L.) were screened for the presence of plastidic and cytosolic isoenzymes of sugar-phosphate metabolism. Isoenzyme separation was achieved by anion-exchange chromatography on Fractogel TSK DEAE-650(S). The mutant tissue had a markedly reduced level of plastidic 3-phosphoglycerate kinase, triosephosphate isomerase, and aldolase activity. In contrast, the activity of plastidic glucosephosphate isomerase, fructose 1,6-bisphosphatase, 6-phosphogluconate dehydrogenase, starch phosphorylase, and ADP-glucose pyrophosphorylase was in the same range as in wild-type leaf tissue. The activity of the corresponding cytosolic isoenzymes (including UDP-glucose pyrophosphorylase) showed essentially no differences in mutant and wild type. The same trend was observed in dark-grown mutant and wild-type leaves. Interestingly, the total activity levels of all isoenzymes were about the same when comparing dark-grown and light-grown mutant or wild-type plants. From these data, it is concluded that mutant leaves exhibit a selective decrease of a subgroup of plastidic isoenzymes associated with the Calvin cycle.

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