Abstract
Genes causing hybrid pollen sterility were identified in a cross between japonica rice (Oryza sativa L. cv. Taichung 65) and African rice (O. glaberrima Steud. [Acc. 104038] from Senegal). Completely sterile F 1 hybrids were observed between the two species. The hybrid pollen sterility genes were identified by quantitative trait loci (QTL) analysis and linkage mapping of advanced backcross progeny. QTL analysis using a BC 2 F 1 population revealed QTLs on chromosomes 3, 7, and 10. These loci were isolated based on the genetic background of Taichung 65 through repeated backcrossing. The location of each locus on the restriction fragment length polymorphism map was determined using BC 5 F 1 . Four new loci—S18, S19, S20, and S21— were mapped on chromosomes 10, 3, 7S, and 7L. Sterile pollens caused by different genes showed different morphology. This indicates the existence of various mechanisms involved in pollen sterility. The expressed F 1 sterility between Taichung 65 and O. glaberrima can be attributed to these newly identified loci.
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