知识与财富的链接
利用水稻汕优63（珍汕97 × 明恢63）重组自交系群体241个株系,对株高、生育期、产量及其产量构成因子等9个重要农艺性状进行了年度间的QTL定位和比较。结果表明,9个性状的表现型在两年均为连续分布,且都存在一定数量的双向超亲遗传类型。两年共检测到64个QTL,分布于水稻除第4染色体外的其余11条染色体,其中1999年检测到45个,2000年检测到35个,两年相同的QTL共16个。2000年检测到的QTL贡献率介于283%~1499%,且大多低于1999年。不同环境可以影响QTL的表达,但表达差异并不全是QTL×环境(QE)互作结果,也可能是由于该性状的遗传力偏低、QTL本身效应偏低或QE互作等原因共同造成的。另外,检测到8个显著的QE互作,但其互作效应明显低于对应的QTL效应。
QTL for nine important agronomic traits including plant height, heading time, yield and yield components were investigated in two years (1999-2000) by using a population of 241 RIL population derived from an elite hybrid cross of “Zhenshan 97 × Minghui 63”. Results showed that the tremendous transgressive segregations for nine traits were observed in the population and the frequencies of these traits were approximately normally distributed. A total of 64 QTL distributed on 11 rice chromosomes except the forth one were detected in 1999 and 2000, including 45 and 35 QTL in 1999 and 2000, respectively, and 16 QTL were both found in two years. The contributions of QTL in 2000 were 2.83%-14.99%, which were lower than those in 1999. Different environments could affect QTL expressing, but differential expression of two-year QTL was not completely resulted from QTL×environment(QE) interactions, maybe it was the common results of lower heredity, lower genetic effects of QTL and QE interactions In addition, eight significant QE interactions were identified, but their genetic effects were obviously lower than those of related QTL.
