Male Parent Plays More Important Role in Heat Tolerance in Three-Line Hybrid Rice

作     者：FU Guan-fu ZHANG Cai-xia YANG Yong-jie XIONG Jie YANG Xue-qin ZHANG Xiu-fu JIN Qian-yu TAO Long-xing 

作者机构：National Key Laboratory of Rice BiologyChina National Rice Research Institute Zhejiang Science &Technology University 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2015年第22卷第3期

页      面：116-122页

核心收录：

学科分类：0710[理学-生物学] 0831[工学-生物医学工程（可授工学、理学、医学学位）] 080703[工学-动力机械及工程] 08[工学] 09[农学] 0807[工学-动力工程及工程热物理] 0901[农学-作物学] 0836[工学-生物工程] 0902[农学-园艺学] 

基　　金：funded by the National Natural Science Foundation of China (Grant Nos. 31201150 and 31101116) the Research Grant of China National Rice Research Institute (Grant No. 2012RG004-3) the Special Fund for Agro-Scientific Research in the Public Interest (Grant No. 201203029) the National System of Rice Industry (Grant No. CARS-01-27) 

主　　题：hybrid rice genetic correlation analysis heat stress heat tolerance 

摘      要：Ten F1 combinations with their male and female parents were employed to evaluate their heat tolerance during the flowering and early grain filling stages. The rice plants were subjected to heat stress（39 °C–43 °C） for 1–15 d during flowering. Based on the heat stress index, heat tolerance was only observed in the F1 combinations H2（K22A × R207）, H3（Bobai A × R207） and H4（Bobai A × Minghui 63）, whereas the others received above 0.5000 of heat stress index. Both parents of the tolerant combination（heat-tolerant × heat-tolerant） possessed heat tolerance, whereas the susceptible combinations were crossed by heat-tolerant（sterile lines） × heat-susceptible（restorer lines）, heat-susceptible × heat-tolerant, or heat-susceptible × heat-susceptible parents. This result indicated that heat tolerance in rice was controlled by recessive genes. Thus, both parents should possess high temperature tolerance to develop heat-tolerant F1 combinations. Furthermore, the heat stress index of F1 combinations was significantly correlated with the heat stress index of restorer lines but not with the heat stress index of maintainer lines. This result suggested that male parents play a more important role in heat-tolerant combinations than female parents. Therefore, the heat susceptibility of the hybrid rice in China is mainly due to the wide application of low-heat-tolerant restorer lines with high yield in three-line hybrid rice breeding.