不育
生物
粳稻
水稻
基因
遗传学
混合的
植物
作者
Jiangyi Yang,Xiaobo Zhao,Ke Cheng,Hongyi Du,Yidan Ouyang,Jiongjiong Chen,Shuqing Qiu,Jianyan Huang,Yunhe Jiang,Liwen Jiang,Jiajia Ding,Jia Wang,Caiguo Xu,Xianghua Li,Qifa Zhang
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2012-09-14
卷期号:337 (6100): 1336-1340
被引量:228
标识
DOI:10.1126/science.1223702
摘要
Hybrid sterility is a major form of postzygotic reproductive isolation that restricts gene flow between populations. Cultivated rice (Oryza sativa L.) consists of two subspecies, indica and japonica; inter-subspecific hybrids are usually sterile. We show that a killer-protector system at the S5 locus encoded by three tightly linked genes [Open Reading Frame 3 (ORF3) to ORF5] regulates fertility in indica-japonica hybrids. During female sporogenesis, the action of ORF5+ (killer) and ORF4+ (partner) causes endoplasmic reticulum (ER) stress. ORF3+ (protector) prevents ER stress and produces normal gametes, but ORF3- cannot prevent ER stress, resulting in premature programmed cell death and leads to embryo-sac abortion. Preferential transmission of ORF3+ gametes results in segregation distortion in the progeny. These results add to our understanding of differences between indica and japonica rice and may aid in rice genetic improvement.
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