中文摘要：

以广陆矮4号为受体，日本晴为供体的119个染色体单片段代换系为材料，通过单因素方差分析和Dun-nett’s多重比较，分析染色体单片段代换系与受体亲本之间糙米率的差异，对代换片段上的糙米率相关QTL进行鉴定。以P≤0．001为阈值共检测到2个糙米率QTL，利用代换作图法将其分别定位在第6染色体和第9染色体上，2个QTL均表现为增效作用，增效位点来自于粳稻亲本日本晴，其加性效应值分别为1．49％和1．32％，加性效应百分率分别为1．89％和1．68％。该研究对进一步发掘和利用新的水稻糙米率QTL具有重要意义，同时对提高水稻糙米率、增加稻米的实际产量具有十分重要的经济价值。

英文摘要：

Brown rice rate is one of the indexes for rice milling quality measurement .In this study ,the inherit-ance of brown rice rate was characterized using 119 chromosome single segment substitution lines ( CSSSLs ) derived from Nipponbare and Guangluai 4 .One-way ANOVA and Dunnett′s test were employed to compare the difference between CSSSLs and the recurrent parent Guangluai 4.We detected 2 QTL(P≤0.001) for brown rice rate which were primarily mapped on chromosome 6 and 9 by substitution mapping .Both of the allele from donor parent Nip-ponbare had positive effects .The additive effects of 2 QTL were 1.49% and 1.32% respectively, with additive effect percentages 1.89%and 1.68%.These results provide useful information for exploring and using new brown rice rate related QTL,and also have important economic value for increasing brown rice rate and actual production of rice.