几个水稻品种抽穗期主效基因与微效基因的定位研究

在构建２张ＲＦＬＰ图谱的基础上，定位分析了控制水稻抽穗期的主效基因和微效基因。在特三矮２号／Ｃ．Ｂ．群体中定位到２个主效基因和２个微效基因。该２个主基因分别位于第３、８染色体上，累加贡献率约达５０％，加性效应值分别为７天和６天，而分别位于第１、１２染色体的２个微效基因的贡献率仅分别为８．３％和９．６％，加性效应值仅为３天和４天。在外引２号／Ｃ．Ｂ．群体中定位了２个连锁于第６染色体的主效基因和１个位于第８染色体的微效基因，该２个主效基因的贡献率分别为３５．５％和２７．４％，来自外引２号的该２个基因其效应均为明显推迟抽穗，因而可推测它们为感光性基因，微效基因的贡献率仅为８．９％，基因效应值较小。

Mapping of Major Genes and Minor Genes for Heading Date in Several Rice Varieties(Oryza sativa L.)

In this study,based on two RFLP maps that had been constructed,major genes and minor genes controlling heading date have been identified and mapped.In Tesanai 2/C.B.population,two major genes on chromosome 3,8 and two minor genes on chromosome 1,12 were mapped,two major genes which collectively explained 49.2% of observed phenotypic variation had additive effects of 7 and 6 days respectively,while two minor genes which explained 8.3% and 9.6% respectively had additive effects from 3 to 4 days.In other population(Waiyin 2/ C.B.),two major genes linked on chromosome 6 and one minor gene on chromosome 8 have been mapped. Two major genes which explained 35.5% and 27.4% of the observed phenotypic variation respectively from Waiyin 2 had gene effects of later heading.They were indicated to be photosensitive genes.While minor gene which explained 8.9% of the observed phenotypic variation had a small gene effect.