Hybrid sterility gene loci in cultivated rice (Oryza sativa L.)
2001
Jian Min Wan | Jiang Ling | Zhai Huqu (Nanjing Agricultural Univ., 210095 (China). Biology Research Center)
Since mid 1980s, the sterility in indica-japonica crosses has been explained by allelic interaction at locus S-5. Indica and japonica varieties carry S-5i and S-5j alleles, respectively. Some varieties have a neutral allele S-5n. The genotype of S-5i/S-5j produces semi-sterile panicles due to partial abortion of female gametes carrying the allele S-5j. Such abortion does not occur in S-5n/S-5i and S-5n/S-5j alleles. The donor of S-5n is referred to as wide compatible variety (WCV). This allele has been incorporated into indica or japonica varieties to overcome hybrid sterility in hybrid rice breeding. So far, the S-5n has been effective in a large number of indica-japonica crosses. Recently, a number of new hybrid sterility gene loci have been identified by RFLP [restriction fragment length polymorphism]. A locus S-7 was detected in hybrids between a Korean indica variety and some javanica varieties. A locus S-9 was detected in hybrids between Aus varieties and some javanica varieties. A locus S-15 was found in hybrids between Aus variety Dular (WCV) and some IRRI lines. A locus S-16 was identified located near RFLP marker on Chromosome 1 in hybrids between Katan Nangka and local varieties from the Tai-hu Lake region and Yunnan Province of China. One more locus S-17 (t) was identified in crosses between Penuh Baru 2 and the japonica varieties. The neutral S-8n, S-9n, S-15n, S-16n, and S-17n were also found in Akihikari, IR36, Ketan, Nangka, Bauten, respectively. Further genetic analyses and clone of these neutral allele are on going
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