Changes of Antioxidant Enzyme Activities in Anthers and Leaves from Three Types of Rice Male Sterile Lines

In order to further understand the rice male sterility phenomenon, the changes of activities of super oxide dismutase (SOD), peroxidase (POD), catalase (CAT) and contents of malondialdehyde (MDA) in rice anthers and flag leaves as well as photosynthetic rate were investigated for three types of the male sterile rices, photo-thermo sensitive cytoplasmic male sterile ‘2310SA’ line, photo-thermo sensitive genic male sterile ‘2310S’ line, cytoplasmic male sterile ‘2277A’ line and normal japonica rice under different conditions. The results showed that anther was more sensitive than leaf on light or temperature stress and there was obvious difference of active oxygen metabolism between fertile and sterile anthers. The abortive physiological phenomena of different types of sterile rices were not the same. Daylength or temperature changes had more powerful influence on ‘2310S’ line anthers, in which the performance of the three kinds of antioxidant enzyme above couldn’t act synergistically during ear late development, namely high SOD activity, low POD activity, membrane lipid peroxidation and its timing advance. The results also showed that POD activity remained stable low throughout during investigation periods for three kinds of sterile lines and might have directly relation to pollen abortion, in addition, photosynthetic rate was relatively also low in the sterile rices.