Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (15): 6-11.doi: 10.11924/j.issn.1000-6850.casb16030079

Special Issue: 生物技术 水稻

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Concentration of Florets Flowering Time is the Important Factors Affecting Outcrossing Rate of Japonica Rice CMS Lines

  

  • Received:2016-03-10 Revised:2016-03-31 Accepted:2016-04-18 Online:2016-06-01 Published:2016-06-01

Abstract: Clarifying the relationship between the flowering characters and the outcrossing rate of japonica rice CMS lines, is important foundation for high outcrossing rate of japonica rice CMS lines breeding. Based on the evaluation of the outcrossing rate of 284 Dian-type CMS lines and the flowering characters observation in parts of CMS lines, the correlation analysis and fine comparation methods are used, the results indicated that the outcrossing rate is great different among the japonica rice CMS lines, and most of the lines possess relatively low outcrossing rate, but a few of high outcrossing rate lines are also identified. The correlation analysis shows that the floret opening angle (FOA) is significant positive correlated with the outcrossing rate. After fine observation of the flowering habits in three CMS lines, the results show that the concentration of florets flowering time (CFFT) is the main factors affecting outcrossing rate of japonica rice CMS lines. In conclusion, in breeding activity, the FOA and CFFT should be focused to improve the outcrossing rate of the japonica rice CMS lines.

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