无机砷胁迫下水稻苗期的生理响应

his experiment was carried out to investigate the physiological responses of rice seedling under stress of different species of inorganic arsenics (As2O3 and HAsNa2O4). The results indicated that the root length, plant height, and dry weight of rice were significantly decreased. Analysis of superoxide dimutase (SOD), peroxidase (POD), and catalase (CAT) activities in roots and leaves of rice seedlings showed that as arsenics concentration increased, the activity of the three enzymes was significantly suppressed, especially in rice roots. Simultaneously, the contents of nitrogen, phosphorus, and potassium in rice plants were also descended as arsenic concentration increased, and severely depressed in rice roots. The result of ICP-MS assay showed that under arsenic treatment, the content of arsenics in rice tissues enhanced as the arsenic concentration increased, especially in rice roots. From all the results we also found a coherence conclusion that the toxicity of As (III) on rice is greater than that of As(V).