An asymmetric allelic interaction drives allele transmission bias in interspecific rice hybrids

Yongyao Xie, Jintao Tang, Xianrong Xie, Xiaojuan Li, Jianle Huang, Yue Fei, Jingluan Han, Shuifu Chen, Huiwu Tang, Xiucai Zhao, Dayun Tao, Peng Xu, Yao-Guang Liu and Letian Chen ()
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Yongyao Xie: South China Agricultural University
Jintao Tang: South China Agricultural University
Xianrong Xie: South China Agricultural University
Xiaojuan Li: South China Agricultural University
Jianle Huang: South China Agricultural University
Yue Fei: South China Agricultural University
Jingluan Han: South China Agricultural University
Shuifu Chen: South China Agricultural University
Huiwu Tang: South China Agricultural University
Xiucai Zhao: South China Agricultural University
Dayun Tao: Yunnan Academy of Agricultural Sciences
Peng Xu: Yunnan Academy of Agricultural Sciences
Yao-Guang Liu: South China Agricultural University
Letian Chen: South China Agricultural University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract Hybrid sterility (HS) between Oryza sativa (Asian rice) and O. glaberrima (African rice) is mainly controlled by the S1 locus. However, our limited understanding of the HS mechanism hampers utilization of the strong interspecific heterosis. Here, we show that three closely linked genes (S1A4, S1TPR, and S1A6) in the African S1 allele (S1-g) constitute a killer-protector system that eliminates gametes carrying the Asian allele (S1-s). In Asian–African rice hybrids (S1-gS1-s), the S1TPR-S1A4-S1A6 interaction in sporophytic tissues generates an abortion signal to male and female gametes. However, S1TPR can rescue S1-g gametes, while the S1-s gametes selectively abort for lacking S1TPR. Knockout of any of the S1-g genes eliminates the HS. Evolutionary analysis suggests that S1 may have arisen from newly evolved genes, multi-step recombination, and nucleotide variations. Our findings will help to overcome the interspecific reproductive barrier and use Asian–African hybrids for increasing rice production.

Date: 2019
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DOI: 10.1038/s41467-019-10488-3

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