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A selfish genetic element confers non-Mendelian inheritance in rice

文献类型： 外文期刊

作者： Yu, Xiaowen 1 ; Zhao, Zhigang 1 ; Zheng, Xiaoming 2 ; Zhou, Jiawu 3 ; Kong, Weiyi 1 ; Wang, Peiran 1 ; Bai, Wenting 1 ; Z 1 ;

作者机构： 1.Nanjing Agr Univ, Natl Key Lab Crop Genet & Germplasm Enhancement, Jiangsu Plant Gene Engn Res Ctr, Nanjing 210095, Jiangsu, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

3.Yunnan Acad Agr Sci, Food Crops Res Inst, Kunming 650200, Yunnan, Peoples R China

4.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China

期刊名称：SCIENCE （ 影响因子：47.728； 五年影响因子：51.433 ）

ISSN： 0036-8075

年卷期： 2018 年 360 卷 6393 期

页码：

收录情况： SCI

摘要： Selfish genetic elements are pervasive in eukaryote genomes, but their role remains controversial. We show that qHMSZ a major quantitative genetic locus for hybrid male sterility between wild rice (Oryza meridionalis) and Asian cultivated rice (O. sativa), contains two tightly linked genes [Open Reading Frame 2 (ORF2) and ORF3]. ORF2 encodes a toxic genetic element that aborts pollen in a sporophytic manner, whereas ORF3 encodes an antidote that protects pollen in a gametophytic manner. Pollens lacking ORF3 are selectively eliminated, leading to segregation distortion in the progeny. Analysis of the genetic sequence suggests that ORF3 arose first, followed by gradual functionalization of ORF2. Furthermore, this toxin-antidote system may have promoted the differentiation and/or maintained the genome stability of wild and cultivated rice.

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