Effect of Photoinhibitory Treatments on the Activity of Light-Activated Enzymes of C3 and C4 Photosynthetic Carbon Metabolism

AUTOR(ES)

Powles, Stephen B.

RESUMO

Exposure of maize leaves to a 3-hour photoinhibitory treatment (photon flux rate of 2,000 microeinsteins meter−2 second−1, CO2-free air) resulted in lower activities of the light-activated enzymes NADP malate dehydrogenase, pyruvate, Pi dikinase, and ribulose-5-phosphate kinase. The activities could be recovered partially either by incubating enzyme extracts with dithiothreitol or by illuminating the treated leaf in air. Several enzymes which are not light-activated were not affected by the treatment. Ribulose-5-phosphate kinase activity was also reduced when bean plants grown in low light were subjected to a similar photoinhibitory treatment.

Documentos Relacionados

• A light-activated GTPase in vertebrate photoreceptors: Regulation of light-activated cyclic GMP phosphodiesterase
• Cell position and light influence C4 versus C3 patterns of photosynthetic gene expression in maize.
• Unusual C3 and C4 metabolism in the chemoautotroph Alcaligenes eutrophus.
• Adhesives with different pHs: effect on the MTBS of chemically activated and light-activated composites to human dentin
• Additional component required for activity and reconstitution of light-activated vertebrate photoreceptor GTPase.