本研究用珍佳b(佳辐占/珍汕97b//珍汕97b的回交重组自交系f11,即bC1f11)x珍汕97b的f2群体,对稻米粒长、粒宽、长宽比、粒厚和垩白粒率性状进行遗传分析与QTl定位。结果表明,粒宽、长宽比、粒厚和垩白粒率均属于由多基因控制的数量性状,而粒长受一个主效基因控制。共检测到13个控制糙米粒长、粒宽、长宽比、粒厚和垩白粒率的QTlS。其中,在第3号染色体着丝粒附近rM16-rM411区间同时控制粒长、粒宽、长宽比和粒厚性状,遗传贡献率分别为49.8%、12.6%、39.3%和5.3%;在第5号染色体着丝粒附近rM7118-rM3683区间同时控制垩白粒率、粒宽、长宽比和粒厚性状,遗传贡献率分别为43.9%、44.5%、28.0%和15.0%;同时,在rM169-rM289区间也同时控制垩白粒率、粒宽、长宽比和粒厚性状,但各性状的遗传贡献率均较rM7118-rM3683区间的小。The F2 population was derived from the cross ZS97B (Zhenshan97B)×ZJB (ZhenjiaB) which was the backcross recombinant inbred line from Jiafuzhan×ZS97B.Based on the F2 population, the genetic analysis and QTL mapping of grain appearance quality traits, included grain length, grain width, grain shape (grain length-width ratio), grain thickness and PGWC (percentage of grain with chalkiness), was conducted.Grain width, grain shape, grain thickness and PGWC, belonged to the quantitative trait inheritance.But grain length showed the polygenic inheritance with a major gene.13 QTL associated with grain appearance quality traits were detected in this study.RM16-RM411 located in the pericentromeric region of rice chromosome 3 could explain 49.8%, 39.3%, 12.6%, 5.3% of the phenotypic variation, respectively, for grain length, grain shape, grain width and grain thickness.RM7118-RM3683 located in the centromeric region of rice chromosome 5 was associated with PVE (phenotypic variation explained) of 43.9%, 44.5%, 28.0% and 15.0%, respectively, for PGWC, grain width, grain thickness and grain shape.In addition, another pleiotropic QTL located between RM169 and RM289 on rice chromosome 5 was associated with less PVE for PGWC, grain width, grain thickness and grain shape than RM7118-RM3683.福建省科技创新平台建设计划项目(2007N2005);福建省科技重大专项(2008NZ0001);福建省自然科学基金项目(2011J01249);中央高校基本科研业务费专项资金(2010121088);厦门市科技计划项目(3502Z20083003)共同资
