Adjustment to Low Light Intensity Enhances Susceptibility of Bean Leaves to Oxidative Stress

Autor: Shainberg, Oren, Rubin, Baruch, Rabinowitch, Haim D., Libal-Weksler, Yael, Tel-Or, Elisha
Zdroj: Journal of Plant Physiology; September 1999, Vol. 155 Issue: 3 p393-398, 6p
Abstrakt: We studied the effect of a short term shading on the activity of the antioxidative system in primary leaves of Phaseolus vulgaris(cv. Pinto) and the response of the shaded beans to subsequent oxidative stress. Shaded bean leaves demonstrated a 35 % decrease in activity and concentration of glutathione reductase (GR, EC 1.6.4.2) and reduced glutathione (GSH) and a 30 % decrease in concentration of chloroplastic CuZn-superoxide dismutase (SOD, EC 1.15.11). No difference was observed in activities of ascorbate peroxidase (APX, EC 1.11.1.11) and catalase (EC 1.11.1.6) and the concentration of cytosolic CuZn-SOD. Two days shading (20 % of that of daylight) of bean plants resulted in increased sensitivity to methyl viologen and SOZ as compared to unshaded control plants but there was no difference in the sensitivity to ozone. Shaded leaves suffered smarked increase in ion leakage and water losses, and developed more necrotic lesions as compared to the control leaves.
Databáze: Supplemental Index
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