PHYSIOLOGICAL AND BIOCHEMICAL RESPONSES TO CHROMIUM STRESS FOR RICE (Oryza Sativa L.) UNDER MOLYBDENUM APPLICATION AND CORRESPONDING CHROMIUM ABSORPTION CHARACTERISTICS.

To explore the mitigation effect of molybdenum application on chromium-stressed rice, the effects of 4 different molybdenum gradients (0, 0.05, 0.5 and 1.0mg·L-1) on growth, physiological biochemistry, chromium enrichment for rice under low-1) and high chromium-1) were studied using a culture experiment. The results showed that molybdenum application with low concentration (0.05 and 0.5mg·L-1) could promote shoot and root length of rice, and increase the soluble protein and chlorophyll content under chromium stress. Molybdenum application with different concentration could decrease malondialdehyde (MDA) content, superoxide dismutase (SOD) activity, peroxidase (POD) activity and catalase (CAT) activity. In addition, molybdenum application could effectively inhibit the chromium enrichment for rice. The chromium tolerance of rice was significantly improved, characterized by biomass level of rice, improving its physiological and biochemical performances, reducing the chromium absorption through participating in the physiological processes of rice, and thus improving its tolerance to rice. In conclusion, exogenous molybdenum can effectively reduce the toxic effect of chromium stress on rice. [ABSTRACT FROM AUTHOR]