Genetics of F1 pollen sterility in Oryza sativa
1996
Zhang, G. | Lu, Y.
A series of isogenic F1 sterile lines (ISLs) of Taichung 65 was used for isogenic analysis of F1 pollen sterility. Three loci of the F1 pollen sterility genes, S-a, S-b, and S-c, were identified in the ISLs. Using the ISLs as testers, the genotypes at the three loci in 45 varieties including indica, japonica, intermediate, and wide-compatibility types were tested. Three other loci of F1 pollen sterility genes, S-d, S-e, and S-f, were found in crosses Taichung 65/Karang Serang, Taichung 65/N29, and Yongshanxiaobaigu/Guangluai 4, respectively. The action of the F1 pollen sterility genes was in the one-locus sporogametophytic interaction model. The allelic interaction of Si/Sj at the loci caused abortion of the male gametes carrying the Sj allele. In F1 hybrids, the more heterozygous the six loci were, the higher the pollen sterility and spikelet sterility. Spikelet sterility in the F1 hybrids was caused by pollen sterility. Therefore, F1 sterility in rice is mainly pollen sterility. Understanding the genetic basis of F1 sterility is an important step toward overcoming the F1 sterility barrier between distantly related varieties in rice
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