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《Journl of Guangxi Agricultural and Biological Science》 1987-02
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Li Guiping  
On the basis of synchronous elongation law of the leaf, leaf sheath and internode of the rice, the relationship between exogenic-gibberellin effect and the elongation of internode and sheath were studied in CMS line Zhenshan 97. The result showed that: (1) The elongation of the 1 st internode from the apex responsed slowly to gibberellin application before heading. From heading, day to three days latter, its elongation was quite clear. So, the author suggested that in hybrid rice seed production and CMS line multiplication the best time for using gibberellin should be at one day before heading for single ear and at a time when the population is with 30--40% heading for field application. (2) The elongation of the 2nd internode from the apex was sensitive to gibberellin during the heading time. Generally the effect can be seen one day after gibberellin application. So, the earlier the gibberellin is used, the better the effect will be. However the elongation is useless for heading. (3) The flag leaf sheath length affects heading. Its length≤25cm is favorable for ear appearance of Zhenshan 97A. If it is too long, it is necessary to increase the application frequency and concentra- tion of exogenic gibberellin.
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