Fine mapping of S32(t), a new gene causing hybrid embryo sac sterility in a Chinese landrace rice (Oryza sativa L.)
文献类型： 外文期刊
作者： Li, Danting 1 ; Chen, Liangming 1 ; Jiang, Ling 1 ; Zhu, Susong 2 ; Zhao, Zhigang; Liu, Shijia; Su, Ning; Zhai, 1 ;
作者机构： 1.Nanjing Agr Univ, Natl Key Lab Crop Genet & Germplasm Enhancement, Jiangsu Plant Gene Engn Res Ctr, Nanjing 210095, Peoples R China; Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China; Nihon Univ, Dept Breeding, Fujisawa 2528510, Japan; Guangxi Acad Agr Sci, Inst Rice Res, Nanning 530007, Peoples R China
2.Nanjing Agr Univ, Natl Key Lab Crop Genet & Germplasm Enhancement, Jiangsu Plant Gene Engn Res Ctr, Nanjing 210095, Peoples R China; Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China; Nihon Univ, Dept Breeding, Fujisawa 25
关键词： Oryza sativa;Indica-japonica hybrids;hybrid sterility;fine mapping
期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）
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收录情况： SCI
摘要： Ketan Nangka, the donor of wide compatibility genes, showed sterility when crossed to Tuanguzao, a landrace rice from Yunnan province, China. Genetic and cytological analyses revealed that the semi-sterility was primarily caused by partial abortion of the embryo sac. Genome-wide analysis of the linkage map constructed from the backcross population of Tuanguzao/Ketan Nangka//Ketan Nangka identified two independent loci responsible for the hybrid sterility located on chromosomes 2 and 5, which explained 18.6 and 20.1% of phenotypic variance, respectively. The gene on chromosome 5 mapped to the previously reported sterility gene S31(t), while the gene on chromosome 2, a new hybrid sterility gene, was tentatively designated as S32(t). The BC1F2 was developed for further confirmation and fine mapping of S32(t). The gene S32(t) was precisely mapped to the same region as that detected in the BC1F1 but its position was narrowed down to an interval of about 1.9 cM between markers RM236 and RM12475. By assaying the recombinant events in the BC1F2, S32(t) was further narrowed down to a 64 kb region on the same PAC clone. Sequence analysis of this fragment revealed seven predicted open reading frames, four of which encoded known proteins and three encoded putative proteins. Further analyses showed that wide-compatibility variety Dular had neutral alleles at loci S31(t) and S32(t) that can overcome the sterilities caused by these two genes. These results are useful for map-based cloning of S32(t) and for marker-assisted transferring of the neutral allele in hybrid rice breeding.
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