Variation in domesticated rice inflorescence architecture revealed by principal component analysis and quantitative trait locus analysis
Variation in domesticated rice inflorescence architecture revealed by principal component analysis and quantitative trait locus analysis
复制标题
DOI：
10.1270/jsbbs.61.52
复制
发表时间：
2011-03-01
期刊：
影响因子：
2.4
通讯作者：
Ebana, Kaworu
中科院分区：
文献类型：
--
作者：
Taguchi-Shiobara, Fumio;Kojima, Yoichiro;Ebana, Kaworu
分离出决定水稻品种变异的因子。花序构型，我们进行了主成分分析（PCA），292个种质（136个籼稻和156个粳稻）。第一个分量占总方差的40.6%，其主要分量被解释为次生分支原基形成时期的延长。第二成分占23.4%，其主要成分是由于在花序轴和一级枝上形成了较多的原基。籼型的一次枝梗及其侧生器官较多，而粳型的穗轴较长，侧生器官较多，表明穗发育存在异时性差异。对5个F-2群体和一组回交自交系进行了穗部性状和抽穗期的数量性状基因座（QTL）分析;这些自交系来自越光与其他6个品种的杂交，包括每穗小穗数的前3个品种。共检测到10个穗部性状的174个QTL。只有第3、6和7染色体上的QTL是共享的，而且只有两个或三个群体共享，这表明驯化水稻花序结构的变异是由许多基因决定的。
To isolate the factors that define variation in domesticated rice (Oryza saliva L.) inflorescence architecture, we performed a principal component analysis (PCA) using 292 accessions (136 indica and 156 japonica). The first component accounted for 40.6% of the total variance, and its main components were interpreted as lengthening of the stage in which secondary branch primordia were formed. The second component accounted for 23.4%, and its main components were explained by formation of more primordia on the rachis and primary branches. Indica tended to have more primary branches and their lateral organs, whereas japonica tended to have a longer rachis with more lateral organs, suggesting that there were heterochronic differences in panicle development. Quantitative trait locus (QTL) analyses for panicle traits and heading date were performed in 5 F-2 populations and a set of backcross inbred lines; these were derived from crosses between Koshihikari and six other accessions, including the top three for number of spikelets per panicle. A total of 174 QTLs were detected for 10 panicle traits. Only the QTLs on chromosomes 3, 6, and 7 were shared, and only by two or three populations, suggesting that variation in domesticated rice inflorescence architecture is determined by many genes.