QTL analysis for resistance to preharvest sprouting in rice (Oryza sativa)

文献类型： 外文期刊

第一作者： Zhang, Y. Z.

作者： Zhang, Y. Z.;Gao, F. Y.;Ren, G. J.;Lu, X. J.;Sun, S. X.;Li, H. J.;Gao, Y. M.;Luo, H.;Yan, W. G.

作者机构：

关键词： Oryza sativa;quantitative trait loci;linkage disequilibrium

期刊名称：PLANT BREEDING （ 影响因子：1.832； 五年影响因子：1.956 ）

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年卷期：

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收录情况： SCI

摘要： Preharvest sprouting (PHS) is caused by early breaking of seed dormancy. In Sichuan, a major hybrid rice seed production area of China, PHS in hybrid seeds originated from 'G46A' parent may lead to severe yield loss, causing serious damage to agricultural production. To detect quantitative trait loci (QTLs) governing PHS, we developed an F population of 164 plants derived from 'G46B' and 'K81', a near-isogenic introgression line of G46B, with high level of resistance to PHS. PHS was evaluated under controlled field and laboratory conditions. Using simple sequence repeat markers, we constructed a linkage map from this population and identified three QTLs for PHS, namely qPSR2, qPSR5 and qPSR8, which were located on chromosomes 2, 5 and 8, respectively. Among these QTLs, qPSR8, residing in the interval between RM447 and RM3754 on chromosome 8, was the major QTL controlling PHS, for it had a relative high logarithm of the odds (LOD) score and explained 43.04% of the phenotypic variation. These results were correspondent to those identified in extreme low germination rate plants (ELGP) using linkage and linkage disequilibrium. At all loci, 'K81' was responsible for enhancing the resistance to PHS.

分类号： S3

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