Abstract
The objective of this study was to understand the genetic basis of pollen sterility of indica– japonica hybrid rice ( Oryza sativa L.). From a set of chromosomal segment substitution lines that each contains a single or few of segments from the japonica variety Nipponbare in the genetic background of the indica variety Zhenshan 97B, IL37 was identified as a semisterility line. This substitution line contained only 3 chromosomal segments from Nipponbare. The quantitative trait loci (QTLs) conferring pollen fertility and spikelet fertility were evaluated in Wuhan, Hubei and Lingshui, Hainan environments using the F 2 and F 3 segregation populations. A novel QTL responsible for pollen sterility was detected between microsatellite markers RM262 and RM475 on chromosome 2, which explained 13.9% of the phenotypic variation. This QTL originated from the japonica parent and was considered as a major factor for the semisterility of IL37.
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