Induction of oxidative stress and ultrastructural changes in moss Taxithelium nepalense (Schwaegr.) Broth. under lead and arsenic phytotoxicity

摘要

Changes in physiological, biochemical and ultrastructural level under lead (Pb) and arsenic (As) phytotoxicity were investigated in moss, Taxithelium nepalense. Decrease in dry matter and total chlorophyll was observed in moss under metal treatment. Increase in lipid peroxidation, hydrogen peroxide and superoxide anion radical were visible under Pb compared to As. Accumulation of Pb was found to be maximum compared to As. An increase in superoxide dismutase activity with a concomitant decrease in catalase, peroxidase and glutathione reductase activity was recorded. Both ascorbate and glutathione accumulated to a greater extent under Pb treatment in moss. A distortion in thylakoid ultrastructure in moss chloroplast was noticed under Pb compared to As and control.