Guo Jie, Xu Xiaomei, Li Wentao, Zhu Wenyin, Zhu Haitao, Liu Ziqiang, Luan Xin, Dai Ziju, Liu Guifu, Zhang Zemin, Zeng Ruizhen, Tang Guang, Fu Xuelin, Wang Shaokui, Zhang Guiquan
State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, South China Agricultural University, Guangzhou 510642, China.
Sci Rep. 2016 Jun 1;6:26878. doi: 10.1038/srep26878.
Rice (Oryza sativa L.) is an important staple crop. The exploitation of the great heterosis that exists in the inter-subspecific crosses between the indica and japonica rice has long been considered as a promising way to increase the yield potential. However, the male and female sterility frequently occurred in the inter-subspecific hybrids hampered the utilization of the heterosis. Here we report that the inter-subspecific hybrid sterility in rice is mainly affected by the genes at Sb, Sc, Sd and Se loci for F1 male sterility and the gene at S5 locus for F1 female sterility. The indica-compatible japonica lines (ICJLs) developed by pyramiding the indica allele (S-i) at Sb, Sc, Sd and Se loci and the neutral allele (S-n) at S5 locus in japonica genetic background through marker-assisted selection are compatible with indica rice in pollen fertility and in spikelet fertility. These results showed a great promise of overcoming the inter-subspecific hybrid sterility and exploiting the heterosis by developing ICJLs.
水稻（Oryza sativa L.）是一种重要的主食作物。利用籼稻和粳稻亚种间杂交存在的强大杂种优势，长期以来一直被认为是提高产量潜力的一种有前途的方法。然而，亚种间杂种中频繁出现的雄性和雌性不育阻碍了杂种优势的利用。在此我们报道，水稻亚种间杂种不育主要受Sb、Sc、Sd和Se位点的基因影响F1雄性不育，以及S5位点的基因影响F1雌性不育。通过标记辅助选择在粳稻遗传背景中聚合Sb、Sc、Sd和Se位点的籼稻等位基因（S-i）和S5位点的中性等位基因（S-n）培育出的籼稻亲和粳稻品系（ICJLs），在花粉育性和小穗育性方面与籼稻兼容。这些结果表明，通过培育ICJLs克服亚种间杂种不育并利用杂种优势具有很大的前景。
