Molecular Improvement of Grain Weight and Yield in Rice by Using GW6 Gene

作     者：LI Yuan-yuan TAO Hong-jian ZHAO Xiang-qian XU Jie LI Geng-mi HU Shi-kai DONG Guo-jun SHI Zheng-yuan WU Li-wen HU Jiang YE Guo-you GUO Long-biao 

作者机构：State Key Laboratory of Rice BiologyChina National Rice Research Institute Plant BreedingGenetics and Biotechnology DivisionInternational Rice Research Institute (IRRI)CollegeLos Banos 4031Lagunathe Philippines 

出 版 物：《Rice science》 (水稻科学（英文版）)

年 卷 期：2014年第21卷第3期

页      面：127-132页

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）] 09[农学] 0901[农学-作物学] 0836[工学-生物工程] 0902[农学-园艺学] 

基　　金：supported by grants from the National Science Foundation of China (Grant No. 31271700) National Basic Research Program of China (Grant No. 2013CBA01405) 

主　　题：rice GW6 gene molecular marker-assisted selection yield 

摘      要：Molecular design breeding is one of straightforward approaches to break yield barriers in rice. In this study, GW6 gene for grain length and width from Baodali was transferred into an indica recurrent parent 9311 and a japonica variety Zhonghua 11 （ZH11） using marker-assisted backcross （MAB）. One and three introgression lines were selected for phenotypic analysis from 9311 and ZH11 genetic backgrounds, respectively. SSL-1, an improved 9311 near isogenic line with GW6 performed 11%, 19% and 6.7%higher of grain length, 1000-grain weight and single plant yield, respectively, as compared with 9311. All the three improved ZH11-GW6 lines, R1, R2 and R3, had more than 30% increase in grain weight and about 7%higher in grain yield. Seed plumpness of R1, R2 and R3 was improved synchronously because the three ZH11-GW6 lines contained GIF1 （Grain Incomplete Filling 1）, a dominant grain filling gene. Thus, GW6 has high potential in increasing the yield of inbred lines through MAB, making it an important genetic resource in super hybrid rice breeding. This study provides insights in the utilization of GW6 for large grain and high yield rice breeding via molecular design breeding.