Ascorbate-glutathione metabolism during PEG-induced water deficit in Trifolium repens

Ascorbate-glutathione metabolism during PEG-induced water deficit in Trifolium repens In order to elucidate the response of the ascorbate-glutathione (ASC-GSH) cycle to drought stress, the activities of antioxidant enzymes and the levels of molecules involved in the ASC-GSH metabolism were studied in Trifolium repens L. seedlings subjected to PEG-induced water deficit. Compared to the control, the contents of H2O2, thiobarbituric acid reactive substances (TBARS), ascorbate (ASC), dehydroascorbate (DHA), and glutathione disulfide (GSSG) increased in PEG-treated seedlings, whereas the glutathione (GSH) content kept constant during the drought period. Further more, the ASC/DHA and GSH/GSSG ratios decreased in the presence of PEG. Except for that of monodehydroascorbate reductase (MDHAR), the activities of ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR), and glutathione reductase (GR) were up-regulated during water deficit, and the increases in APX and DHAR activities were much higher than those in GR activity. These data indicate that fluctuations in the ASC-GSH metabolism resulted from PEG treatment may have a positive effect on drought stress mitigation in T. repens. Russian Journal of Plant Physiology Springer Journals

Ascorbate-glutathione metabolism during PEG-induced water deficit in Trifolium repens

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SP MAIK Nauka/Interperiodica
Copyright © 2011 by Pleiades Publishing, Ltd.
Life Sciences; Plant Physiology; Plant Sciences
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