CAJ | 학술논문

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.
재강소염성제충기지설치장기다품충분기파충시험,지재탐토불동개화결실전후전간기상조건대결실적영향；2013년염성재8월중하순발생련속18 d 고온천기,해시기여각파기제충수도적개화전시단상중첩.여2011년상비,수도조합신량우223적제충결실솔평균강저6．89개백분점,체현저수평.불동조합수고온영향,결실솔강폭불동,기중,신량우223이교고온내성강우신량우향사화신량우223개.2013년다조합각파기수도이교결실솔여수도시수기전후10 d 일평균기온정현저부상관；회귀분석표명,수도시수기전후10 d 일평균기온체28．0℃,이교결실개시수영향,체29．0℃시이교결실대폭하강.
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 1 1 days in the mid-to-end of August 201 3,in Yancheng,before blooming, seed setting rate of the female parent in 201 3 was significantly reduced by 6.89 percent on average compared with that in 201 1 .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 201 3,but no correlation in 201 1 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.