水稻籽粒灌浆速率的发育遗传机制研究

以小穗小粒型水稻Milyang 46和大穗大粒型FJCD建立的包含130个家系的F10重组自交系为研究材料,分析福建省武夷山和莆田环境下灌浆期5个阶段灌浆速率的性状表现,并结合已构建的遗传图谱进行QTL动态定位及环境互作研究。QTL分析共检测到10个加性QTL,位于1、2、4、5、8、10号染色体上,对表型变异贡献率为4.52％~17.39％。其中,qGR-5-5、qGR-4-2、qGR-10-1分别在灌浆第2、4、5阶段存在显著的环境互作效应,体现了一因多效。qGR-2-1加性效应可解释表型变异的15

Developmental Genetic Mechanism Research on Grain-filling Rate in Rice

Quantitative trait loci(QTL)dynamic mapping and gene ×environment interaction were used to study grain-filling rate for five stages of grain filling from a RIL including 130 lines deriving from Milyang 46 and FJCD.This study was carried in Wuyishan and Putian,Fujian Province.Ten additive QTL were detected in two environments by QTL mapping analysis and located in chromosome 1,2,4,5,8,10.The contribution rates for phenotype variance were from 4.52% to 17.39%.Among them,qGR-5-5,qGR-4-2,qGR-10-1 existed significant additive ×environment interaction effects at 2,4,5 stage of grain filling respectively,manifesting pleiotropic effects.Additive effect of qGR-2-1 accounted for 15.79% of the phenotypic variation.Additive effect of qGR-42 accounted for 17.39% of the phenotypic variation,and its additive ×environment interaction effect accounted for 10.29% of the phenotypic variation.This study revealed dynamical expression of QTL associated with grain-filling rate,and contributed to understand the relationship between grain filling and yield-related traits at gene level.