Abstract: A recombinant inbred line(RIL) population derived from a cross between two elite indica varieties,Zhenshan 97 and HR5,was used to investigate the morphological and physiological characteristics of the functional leaves(flag leaves) at the late developmental stage in rice.A total of 26 QTLs referring the flag leaf characteristics,including morphological characteristics(length,width,and the ratio of length to width),metabolism characteristics(fresh weight,dry weight,water content),and chlorophyll content(chlorophyll a,chlorophyll b,and total chlorophyll contents) were detected,and the phenotypic variation of each QTL ranged from 4.77%-31.67%.Among them,the QTLs for the flag leaf morphology were mainly located on chromosomes 1 and 4,and the QTLs underlying the flag leaf metabolite were on chromosomes 3,7 and 10,whereas those affecting the chlorophyll contents of flag leaf were on chromosomes 3,4 and 9.Interestingly,a main QTL at marker interval RM321-MR6444 on chromosome 9 was identified, which would be beneficial for breeding late-stage vigor super-high-yielding rice.

Key words: rice, flag leaf, quantitative trait loci, morphological character, physiological character, chlorophyll content, recombinant inbred line

摘要： 为了探讨水稻生育后期功能叶尤其是剑叶的形态性状及生理特性对水稻高产的影响，利用来源于籼稻珍汕97/HR5后代的重组自交系群体，对水稻生长后期剑叶形态（长、宽、长宽比）、剑叶代谢产物（鲜质量、干质量、含水量）和剑叶叶绿素含量（叶绿素a、叶绿素b、总叶绿素含量）进行了考查分析和QTL定位。共检测到26个QTL，单个QTL的表型贡献率为4.77%~31.67%。其中控制剑叶形态的QTL主要位于第1和第4染色体，控制剑叶代谢产物的QTL主要位于第3、7和10染色体，控制剑叶叶绿素含量的QTL主要位于第3、4和9染色体上。其中位于第9染色体上的QTL，在后期功能型超级稻育种上具有一定的应用价值。

关键词: 水稻, 剑叶性状, 数量性状座位, 形态性状, 生理性状, 叶绿素含量, 重组自交系