[Light-dependent changes in the enzyme activity of the ascorbate-glutathione cycle and ascorbate oxidase in the leaves of pea].
Light-determined activation of ferments of ascorbate-glutation cycle, ascorbate-oxidase in chloroplasts and cytosol is demonstrated as well as ascorbate-peroxidase, monodehydroascorbate-reductase, glutation-reductase and ascorbate-oxydase in mitochondria. On the other hands activity of mitochondrial dehydroascorbate-reductase increased on reduction of light most likely due to function of electron transport from glutation to dehydroascorbate in mitochondria. Glutation metabolism is proved to be endogenic catalytic process where the amount reconstructed glutation changes slowly with a delay and gradually follow light changes. Light dependable changes of glutation content in chloroplasts ensure resistance of ferment system again hydrogen peroxide and superoxide radicals that generate intensively at light.
Mittova
V O
VO
Dep. of Physiology and Biochemistry of Plants, Voronezh State University, Russia.
Igamberdiev
A U
AU
D001204:Ascorbate Oxidase / Q000378:metabolism / Q000528:radiation effects*; D001205:Ascorbic Acid / Q000378:metabolism / Q000528:radiation effects*; D005978:Glutathione / Q000378:metabolism / Q000528:radiation effects*; D008027:Light; D018532:Pisum sativum / Q000201:enzymology / Q000528:radiation effects*; D018515:Plant Leaves / Q000201:enzymology / Q000528:radiation effects
D001204:Ascorbate Oxidase; D005978:Glutathione; D001205:Ascorbic Acid