Differences in cold lability of pyruvate, Pi dikinase among C4 species |
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| Authors: | Sugiyama T; Schmitt M R; Ku S B; Edwards G E |
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| Institution: | 1Department of Agricultural Chemistry, School of Agriculture, Shizuoka University Ohya 836, Shizuoka 422, Japan
2Department of Horticulture, University of Wisconsin Madison, Wisconsin 53706, USA |
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| Abstract: | The cold lability of pyruvate, Pi dikinase in crude leaf extractswas studied in a number of C4 plants. The survey included C4monocots and dicots and species representingthe three C4 subgroups:NADP-malic enzyme, NAD-malic enzyme, and PEP-carboxykinase types. In some species (e.g., Digitaria sanguinalis, Sorghum bicolorand Echinochloa crus-galli), the enzyme was very sensitive tocold treatment (half life of about 8 min at 0?C and 10 to 15min at 10?C). In other species (Panicum miliaceum, Panicum maximumand Panicum texanum), the enzyme was very cold tolerant (retentionof 60 to 85% activity after 60 min at 0?C and 90% activity after60 min at 10?C). Among the plants examined, the most cold sensitivepyruvate,Pi dikinase was found among species of the NADP-malicenzyme subgroup. (Received March 9, 1979; ) |
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