关键词: 水稻 低温胁迫 耐冷性 根系 生理活性

Abstract:

With sandy culture, the effect of different low-temperature stress on physiological activity of rwt in rice seedlings of four varieties was analyzed. The results showed that their root physiological activity have changed clearly after different chilling stress lasting 3 days at seedling. The root activity and CAT activity and POD activity of Dongxiang wild rice and Dongye1 which have stronger tolerance to cold show off a trend which decrease at first and then increase while decrease in the end. The root activity and CAT activity of two cold-sensitive indica varieties show a declining trend and their POD adivity increase at first and then decease. The MDA content of four rice varieties is increasing with the rising of low-temperature stress while the MDA content of two cold-tolerant cultivars are less severely than the sensitive. The CAT activity and POD activity of sensitive varieties are not probably less than the strong ones. Therefore, we argue that root activity and MDA content are better appraisal method of cold tolerance.

Key words: Rice, Low temperature stress, Cold tolerance, Root system, Physiological activity