| Effect of water stress on photosynthesis and yield character of hybrid rice at different stages |
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| DOI：10.7606/j.issn.1000-7601.2008.06.27 |
| Key Words: hybrid rice water stress Pn yield |
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| Abstract: |
| Responses to three extents of water stress were comparatively studied in two indica hybrid rice differing in sensitivity at tillering booting and flowering stages to investigate the effects of water stress on Pn ROS SOD activity SOD isozymes and yield．The result showed that in light water stress and followed by continuing water stress Pn decreased ROS accumulated and the activity of SOD increased in leaves． However in severe water stress and followed by continuing water stress Pn decreaded rapidly the content ROS and the activity of SOD were higher than in light water stress but at the7～9days the activity of SOD began to decrease． After harvest the magnitude of yield treated with different water stress is summarized as：CK＞light＞severe．The SOD isozymes at flowering stage were analyzed by PAGE and the results showed6different protein bands．Followed by increasing water stress degree the light of protein band increased gradually．It also showed difference in two varieties．The ability of resistance to water stress at three stages were summarized as：Booting stage＞ flowering stage＞tillering stage．B－You 827 had higher resistance to both light and severe water stress compared to Gangyou725at three stages. |