作　　者： ; ; ; ;

机构地区： 浙江大学农业与生物技术学院农学系

出　　处： 《浙江大学学报（农业与生命科学版）》 2006年第5期527-534,共8页

摘　　要： 水稻分蘖数和株高是两个重要的农艺性状.为剖解它们的遗传结构,本研究用一套来源于籼粳组合IR64×Azucena的DH群体对这两个性状进行了QTL定位分析.表型数据来源于两个生长季节,采用基于混合线性模型的方法分析.结果表明,分蘖数主要由普通遗传因素和互作遗传因素控制(呈现61.7%的普通遗传率和17.2%的互作遗传率),共有19个QTLs与分蘖数有关,其中9个和6对QTLs分别具有单位点的遗传效应和2位点的互作效应,QTL1-8和QTL1-12的上位性效应由于在春季的贡献率达21.6%,因而认为是一对主效.株高主要由普通遗传因素控制,普通遗传率为92.6%,共受到15个QTLs的影响,其中8个QTLs具有加性效应,1个QTL具有加性与环境的互作效应,4对上位性QTLs具有加性与加性互作效应.QTL1-15被认为是主效QTL,而其余的是微效QTLs.两个性状表型之间存在显著的负向部分相关,然而,性状相关的遗传基础仍需做进一步的探讨. Tiller number and plant height are two important agronomic traits of rice. In order to dissect their genetic architecture, QTL mapping for the two traits was conducted by using a DH population derived from an indica-japonica rice cross of IR64 × Azucena. Phenotypic data was evaluated in two crop seasons and analyzed by the mixture-model based on composite interval mapping （MCIM） method. The results showed that tiller number is mainly controlled by both the general genetic factor and the GE interaction factor （with 61.7% of the general heritability and 17.2% of the GE interaction heritability）. A total number of 19 QTLs was detected to associate with tiller number. Of these, 9 and 6 QTLs were with single locus effects and digenic effects, respectively. The epistatic effect between QTL 1-8 and QTL 1-12 was suggested to be a major effect due to the contribution of 21.6% in spring season. Plant height is mainly controlled by the general genetic factor with 92.6% of the general genetic heritability, which is influenced by a total number of 15 QTLs. Of those, 8 QTLs with additive effects, 1 QTL with additive X environment interaction effect and 4 pairs of epistatic QTLs with additive × additive interaction effects were detected. QTL 1-15 is suggested as a major QTL and the remaining QTLs were ones with minor effects. Significant negative partial phenotypic correlation was observed between the two traits. However, exploring the genetic basis of trait correlation is still necessary in further study.

关 键 词： 遗传分析 分蘖数 株高 水稻

领　　域： [农业科学]