Abstract: Quantitative trait loci(QTL) for three grain shape traits including grain length(GL), grain width(GW) and grain length-width ratio (GLW) were mapped in three environments (Beijing, Hangzhou and Hainan). Totally, 18 QTLs were detected for grain shape, locating on chromosome 1, 2, 3, 4, 6, 8 and 12. Three putative QTLs, nine putative QTLs, and six putative QTLs were detected for grain length, grain width, and length-width ratio, respectively. All of these QTLs explained 9.9% to 18.4% phenotypic variation of grain length, 8.4% to 25.6% for grain width, and 9.8% to 22.7% for length-width ratio. The LOD value varied from 2.69 to 4.75 for grain length, from 2.43 to 5.77 for grain width, and from 2.44 to 6.02 for length-width ratio, respectively.

Key words: rice, grain shape, double haploid population, quantitative trait loci, environment

摘要： 以窄叶青8号和京系17构建的加倍单倍体群体为材料，系统分析了稻谷粒长、粒宽及长宽比3个性状在北京、杭州、海南3个不同环境下的表现，并进行了数量性状基因位点的比较定位。检测结果表明，3个环境下共检测到18个QTLs，分布于水稻第1、2、3、4、6、8和12染色体上，其中与粒长性状相关QTL 3个，LOD值为2.69~4.75，贡献率为9.9%~18.4%；与粒宽性状相关QTL 9个，LOD值为2.43~5.77，贡献率为8.4%~25.6%；与长宽比性状相关QTL 6个，LOD值为2.44~6.02，贡献率为9.8%~22.7%。

关键词: 水稻, 粒型, 加倍单倍体群体, 数量性状基因座位, 环境