John Wiley & Sons, Ltd.

Varietal differences in the growth of rice seedlings exposed to perchlorate and their antioxidative defense mechanisms

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A hydroponic experiment was conducted to investigate the perchlorate (ClO4‐) phytotoxicity in different rice varieties. Considerable variations were observed when 24 rice varieties were treated with ClO4‐. The shoot height, root length and biomass of most varieties were significantly reduced by ClO4‐. The roots were more sensitive than the shoots. Hierarchical clustering analysis demonstrated that there were mainly four groups, namely ClO4‐‐sensitive, medium ClO4‐‐sensitive, medium ClO4‐‐tolerant and ClO4‐‐tolerant varieties. Gannuoxiang (GN, a ClO4‐‐tolerant variety) and IR65598‐112‐2 (IR, a ClO4‐‐sensitive variety) were chosen to explore their antioxidant response when exposed to 0.2, 2.0 and 4.0 mmol/L ClO4‐. The results showed that the activities of superoxide dismutase (SOD) and catalase (CAT) increased in the shoots and roots of GN with increasing doses of ClO4‐, but both of them decreased at higher concentrations of ClO4‐ in IR. The addition of ClO4‐ led to a significant increase in peroxidase (POD) activities for both of the varieties, while the increase was more pronounced in GN than in IR. No significant difference was found in malondialdehyde (MDA) contents in GN, whereas the addition of ClO4‐ increased the MDA level significantly in IR. The results indicated that GN has higher activities of antioxidant enzymes than IR to cope with oxidative damage caused by ClO4‐ stress, which may be the main cause of its high tolerance. This article is protected by copyright. All rights reserved

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