Mapping segregation distortion loci and quantitative trait loci for spikelet sterility in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Wang, CM

作者： Wang, CM;Zhu, CS;Zhai, HQ;Wan, JM

作者机构：

期刊名称：GENETICAL RESEARCH （ 影响因子：1.588； 五年影响因子：1.263 ）

ISSN： 0016-6723

年卷期： 2005 年 86 卷 2 期

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收录情况： SCI

摘要： Markers with segregation ratio distortion are commonly observed in data sets used for quantitative trait locus (QTL) mapping. In this study, a multipoint method of maximum likelihood (ML) was newly developed to estimate the positions and effects of the segregation distortion loci (SDLs) in two F-2 populations of rice (Oryza sativa L.), i.e. Taichung65/Bhadua (TB;japonica-indica cross) and CPSLO17/W207-2 (CW; Japonica-japonica). Of the four parents, W207-2 and Bhadua were found to be spikelet semi-sterile and stably inherited through selfing, and spikelet fertility segregated in the two populations. Therefore, recombination frequencies were recalculated after mapping the SDLs by using the multipoint method, and the molecular linkage maps of the two F2 populations were constructed to detect QTLs underlying spikelet fertility. As a result, five SDLs in the TB population were mapped on chromosomes 1, 3, 8 and 9, respectively. Two major QTLs underlying spikelet fertility, namely qSS-6a and qSS-8a, were detected on chromosomes 6 and 8, respectively. In the CW population, a total of 12 SDLs were detected on all 12 chromosomes except 1, 5, 7 and 11. Three QTLs underlying spikelet sterility, namely qSS-2, qSS-6b and qSS-8b on chromosomes 2, 6 and 8, were determined on the whole genome scale. Interestingly, both qSS-6a and qSS-6b, detected in the two F, populations respectively, were located on a similar position as the S5 gene on chromosome 6; while qSS-8a and qSS-8b were also simultaneously detected on similar positions of the short arm of chromosome 8 in the two populations, which should be a new sterility gene showing the same type of zygotic selection.

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