Out-Crossing Seed Setting Rate Was Seriously Reduced By High-Temperature in Hybrid Rice Seed Production Under Field Conditions

doi:10.3969/j.issn.1001-7216.2015.01.013

Abstract

Abstract:

The experiment with different seeding date was conducted at the hybrid rice seed production site in Yancheng City to explore the impact of weather conditions at the heading stage on seed setting rates for female parents. Exposed to consecutive high temperature lasting for 11 days in the mid-to-end of August 2013, in Yancheng, before blooming, seed setting rate of the female parent in 2013 was significantly reduced by 6.89 percent on average compared with that in 2011. Meanwhile there has been great differences in high-temperature sensitivity among various combinations, with Xinliangyouxiang 4 and Xinliangyou 223-gai being more insensitive than Xinliangyou 223. The out-crossing rates of all the female parents showed a significant negative correlation with high temperature in 2013, but no correlation in 2011 in comparison. Regression analysis showed that when the 10 d average temperature before and after heading stage increased up to 28.0℃, the out-crossing rate of the female parents began to fall, and when it came to 29.0℃ the out-crossing rate significantly reduced.

Key words: hybrid rice, seed production, high temperature, seed setting rate

摘要：

在江苏盐城制种基地设置长期多品种分期播种试验,旨在探讨不同开花结实前后田间气象条件对结实的影响; 2013年盐城在8月中下旬发生连续18 d高温天气,该时期与各播期制种水稻的开花前时段相重叠。与2011年相比,水稻组合新两优223的制种结实率平均降低6.89个百分点,达显著水平。不同组合受高温影响,结实率降幅不同,其中,新两优223 异交高温耐性强于新两优香四和新两优223改。2013年多组合各播期水稻异交结实率与水稻始穗期前后10 d日平均气温呈显著负相关;回归分析表明,水稻始穗期前后10 d日平均气温达28.0℃,异交结实开始受影响,达29.0℃时异交结实大幅下降。

关键词: 杂交水稻, 制种, 高温, 结实率

CLC Number:

Hao-liang YAN, Xing-fu PAN, Jian-zhen CHEN, Yi-min YAO, Bi-lin LU, Xiao-hai TIAN. Out-Crossing Seed Setting Rate Was Seriously Reduced By High-Temperature in Hybrid Rice Seed Production Under Field Conditions[J]. Chinese Journal OF Rice Science, 2015, 29(1): 106-110.

闫浩亮, 潘幸福, 陈建珍, 姚仪敏, 卢碧林, 田小海. 田间高温严重降低杂交水稻制种的异交结实[J]. 中国水稻科学, 2015, 29(1): 106-110.

Figures/Tables 4

References 11

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组合 Combination	父本始穗期(月-日) Initial flowering date for male parent (month-day)	母本始穗期(月-日) Initial flowering date for female parent (month-day)	结实率 Seed setting rate/%	组合内比较 Comparison within the combination (P=0.05)
新两优223 Xinliangyou 223	08-25	08-25	40.3±5.7	a
	08-25	08-27	40.1±8.1	a
	08-24	08-26	39.4±7.7	a
	08-23	08-24	35.1±3.8	ab
	08-22	08-23	34.8±4.5	ab
	08-22	08-22	32.4±3.6	b
新两优香四 Xinliangyouxiangsi	08-21	08-20	20.0±2.1	a
	08-20	08-24	29.8±9.5	b
新两优223改 Xinliangyou 223-gai	08-22	08-27	48.5±15.0	a
	08-22	08-25	32.8±4.7	b
	08-22	08-23	24.6±4.1	b

组合 Combination	父本始穗期(月-日) Initial flowering date for male parent (month-day)	母本始穗期(月-日) Initial flowering date for female parent (month-day)	结实率 Seed setting rate/%	组合内比较 Comparison within the combination (P=0.05)
新两优223 Xinliangyou 223	08-25	08-25	40.3±5.7	a
	08-25	08-27	40.1±8.1	a
	08-24	08-26	39.4±7.7	a
	08-23	08-24	35.1±3.8	ab
	08-22	08-23	34.8±4.5	ab
	08-22	08-22	32.4±3.6	b
新两优香四 Xinliangyouxiangsi	08-21	08-20	20.0±2.1	a
	08-20	08-24	29.8±9.5	b
新两优223改 Xinliangyou 223-gai	08-22	08-27	48.5±15.0	a
	08-22	08-25	32.8±4.7	b
	08-22	08-23	24.6±4.1	b

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