minimal genome design to maximally guarantee fertile inter-subspecific hybrid rice  

作　　者：Penghui Zhou Zhengji Wang Xingchen Zhu Yao Tang Liang Ye Huihui Yu Yating Li Ningke Zhang Ting Liu Tian Wang Yuying Wu Dengyun Cao Yuan Chen Xu Li Qinglu Zhang Jinghua Xiao Sibin Yu Qifa Zhang Jiaming Mi Yidan Ouyang 

机构地区：[1]National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research(Wuhan),Hubei Hongshan Laboratory,Huazhong Agricultural University,Wuhan 430070,China

出　　处：《Molecular Plant》2023年第4期726-738,共13页分子植物（英文版）

基　　金：supported by grants from the National Natural Science Foundation of China(31991223,31991222,32101688,32170622,and 31821005);the National Key Research and Development Program of China(2022YFF1002100);the Hubei Key R&D Program(2020BBA031 and 2020BBA034);Hubei Key R&D Program in Hongshan Lab(2021hszd005,2022hszd017).

摘　　要：Hybrid rice has made considerable contributions to achieve the ambitious goal of food security for the world's population.Hybrid rice from indica/xian and japonica/geng subspecies shows much higher heter-osis and is thereby an important innovation in promoting rice production in the next decade.However,such inter-subspecific hybrid rice has long suffered from serious hybrid sterility,which is a major challenge that needs to be addressed.In this study,we performed a genome design strategy to produce fertile inter-subspecific hybrid by creation of wide compatibility varieties that are able to overcome hybrid sterility.Based on combined genetic analyses in two indica-japonica crosses,we determined that four hybrid ste-rility loci,S5,f5,pf12 and Sc,are the major QTLs controlling inter-subspecific hybrid sterility and thus the minimal targets that can be manipulated for breeding sub-specific hybrid rice.We then cloned the pf12 lo-cus,one of the most effective loci for hybrid male sterility,by map-based cloning,and showed that artificial disruption of pf12A gene at this locus could successfully rescue hybrid fertility.We further dissected the genetic basis of wide compatibility using three pairwise crosses from a wide-compatibility variety Dular and representative indica and japonica varieties.On this basis,we constructed and assembled different combinations of naturally compatible alleles of four loci,S5,Sc,pf12,and f5,and found that the improved lines could fully recover pollen and embryo sac fertility in test-crossed F,s,thereby completely fulfilling the demands of inter-subspecific hybrid spikelet fertility in agricultural production.This breeding scheme would facilitate redesign of future inter-subspecific hybrid rice with a higher yield potential.

关 键 词：BREEDING FERTILITY thereby 

分 类 号：S511[农业科学—作物学]