超级杂交稻国稻6号对开花结实期高温热害的反应  

Effects of High Temperature Stress on Super Hybrid Rice Guodao 6 During Flowering and Filling Phases

作　　者：陶龙兴[1] 谈惠娟[1] 王熹[1] 曹立勇[1] 程式华[1] 

机构地区：[1]中国水稻研究所水稻生物学国家重点实验室,浙江杭州310006

出　　处：《中国水稻科学》2007年第5期518-524,共7页Chinese Journal of Rice Science

基　　金：农业部农业结构调整重大技术研究专项(06-03-01B);农业部中国超级稻研究专项;农业部农业科技跨越计划资助项目(06-01);国家农业综合开发科技推广项目(2006-27-2);浙江省重点攻关项目(2005C22019)

摘　　要：以超级杂交稻国稻6号（内2优6号）为材料：于2005-2006年在杭州分期播种，通过不同齐重穗期条件下的产量及产量构成因子变异研究,分析开花结实期自然高温对灌浆结实的影响,同时在温室条件下设置可控极值高温（40～42℃）测定热害指数。国稻6号对开花结实期自然高温或设计极值高温的反应明导较对照协优46钝感，两者在小穗育性和热害指数上的差异达显著水平（P〈0．05）。试验结果还表明国稻6号随花期日平均温度升高小穗不育率增加，尤其与日最高温度的关系更为密切，两者的相关系数分别为0．8604和0．9850（P〈0．05），表明日最高温度对小穗育性伤害更烈。而灌浆结实期日最高温度对国稻6号结实率的影响不如日平均温度，相关系数分别为0．7352和0．9317（P〈0.05）。Super hybrid rice Guodao 6 was used to analyze its tolerance against natural high temperature stress with different sowing times in field and a greenhouse treatment with controlled high temperature （40-42℃） during flowering to filling was conducted in 2005 and 2006. Differences in seed setting rate under different treatments were＇ohserved and heat injury index, grain yield and yield components were analyzed. Compared with control hybrid rice Xieyou 46, Guodao 6 showed stable yield and spikelet fertility and lower heat injury index under high temperature stress, indicating higher tolerance to high temperature. The spikelet sterility was positively correlated with daily average temperature, especially with daily maximum temperature and the eoeffieients of correlation for Guodao 6 were 0. 8604 and 0.9850 （P〈0.05）, respectively. Meanwhile, daily maximum temperature showed less effect on seed setting rate than daily average temperature during filling, their coefficients of correlation for Guodao 6 were 0. 7352 and 0. 9317 （P〈0. 05）. respectivelv.

关 键 词：超级杂交稻 开花 结实 高温热害 小穗育性 

分 类 号：S511[农业科学—作物学]