数字农科院2.0

QTL analysis of seed dormancy in rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Guo, LB;Zhu, LH;Xu, YB;Zeng, DL;Wu, P;Qian, Q

作者机构：

关键词： double haploid (DH) population;quantitative trait loci (QTL);rice (Oryza sativa L.);seed dormancy

期刊名称： EUPHYTICA

ISSN： 0014-2336

年卷期： 2004 年 140 卷 3 期

页码：

收录情况： SCI

摘要： Effective cumulative temperature (ECT) after heading would be a more reasonable parameter for seed sampling of pre-harvest sprouting/seed dormancy (SD) tests in segregating populations than the days after flowering. SD is an important agronomic trait associated with grain yielding, eating quality and seed quality. To identify genomic regions affecting SD at different grain-filling temperatures, and to further examine the association between SD and ECT during grain-filling, 127 double haploid (DH) lines derived from a cross between ZYQ8 (indica)/JX17 (japonica) by anther culture were analyzed. The quantitative trait loci (QTLs) and their digenic epistasis for SD were identified using a molecular linkage map of this population. A total of four putative QTLs for SD (qSD-3, qSD-5, 6 and 11) were detected on chromosomes 3, 5, 6 and 11, together explaining 41.4% of the phenotypic variation. Nine pairs of digenic epistatic loci were associated with SD on all but chromosome 9, and their contributions to phenotypic variation varied from 2.87%-8.73%. The SD QTL on chromosome 3 was identical to the QTLs found in other mapping populations with different genetic backgrounds, which could be a desirable candidate for gene cloning and marker-assisted selection in rice breeding.

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