Light Modulation of the Activity of Carbon Metabolism Enzymes in the Crassulacean Acid Metabolism Plant Kalanchoë

When intact Kalanchoë plants are illuminated NADP-linked malic dehydrogenase and three enzymes of the reductive pentose phosphate pathway, ribulose-5-phosphate kinase, NADP-linked glyceraldehyde-3-phosphate dehydrogenase, and sedoheptulose-1,7-diphosphate phosphatase, are activated. In crude extract...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1978-03, Vol.61 (3), p.469-471
Main Authors: Vimal K. Gupta, Anderson, Louise E.
Format: Article
Language:English
Subjects:
Carbon dioxide
Chloroplasts
Crassulacean acid metabolism
Dehydrogenases
Enzymes
Light modulation
Peas
Phosphatases
Phosphates
Plants
Short Communications
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Summary:When intact Kalanchoë plants are illuminated NADP-linked malic dehydrogenase and three enzymes of the reductive pentose phosphate pathway, ribulose-5-phosphate kinase, NADP-linked glyceraldehyde-3-phosphate dehydrogenase, and sedoheptulose-1,7-diphosphate phosphatase, are activated. In crude extracts these enzymes are activated by dithiothreitol treatment. Light or dithiothreitol treatment does not inactivate the oxidative pentose phosphate pathway enzyme glucose-6-phosphate dehydrogenase. Likewise, neither light, in vivo, nor dithiothreitol, in vitro, affects fructose-1,6-diphosphate phosphatase. Apparently the potential for modulation of enzyme activity by the reductively activated light effect mediator system exists in Crassulacean acid metabolism plants, but some enzymes which are light-dark-modulated in the pea plant are not in Kalanchoë.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.61.3.469