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| Genetic Mechanism of Hybrid Sterility and Utilization of Indica-japonica Inter-subspecific Heterosis in Rice |
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| DOI：10.16768/j.issn.1004-874X.2022.09.006 |
| Author Name | Affiliation | | GUO Jie1, LIU Shaolong1,2, ZHOU Xinqiao1, CHEN Dagang1, CHEN Ke1, YE Chanjuan1, LI Yixiang1,3, LIU Chuanguang1, CHEN Youding1 | 1. 广东省农业科学院水稻研究所 / 广东省水稻育种新技术重点实验室 / 广东省水稻工程实验室 /农业农村部华南优质稻遗传育种重点实验室，广东 广州 510640；2. 仲恺农业工程学院农业与生物学院，广东 广州 510225；3. 广东海洋大学滨海农业学院，广东 湛江 524088 |
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| Abstract: |
| Asian-cultivated rice (Oryza sativa L.) consists of two subspecies, indica (Oryza sativa L. indica) and japonica (Oryza sativa L. japonica) subspecies. There are considerable differences between them in morphology, physiology and gene level. The stronger heterosis generated by the genetic differences between inter-subspecies could improve the yield potential of rice. However, the application of heterosis in indica-japonica subspecies is limited because of the serious hybrid sterility in F1 hybrid. Hybrid sterility, a common form of postzygotic reproductive isolation, is universal and complex, controlled by multiple hybrid sterility loci. The discovery of wide-compatible varieties (WCVs) provides the possibility to overcome interspecific hybrid sterility as the F1
hybrids show normal fertility whether WCVs crossed with indica or japonica rice. In this paper, we summarize the indica-japonica divergence, the genetic basis of hybrid sterility in indica-japonica subspecies, the identified hybrid sterility QTL and genes, and analyze the molecular mechanisms of the cloned hybrid sterility genes and the function of wide-compatible genes. On this basis, we propose four approaches to overcome inter-subspecific hybrid sterility, and improve the fertility of indica-japonica F1 hybrids precisely, including breeding inter-subspecific introgression rice,
developing indica-compatible japonica lines and wide-compatible lines, and creating wide-compatible genes by gene editing technology. The application of indica-japonica hybrid rice will promote a major change in rice industry. |
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