太湖稻区粳稻地方品种主要经济性状的遗传分析

A Genetic Analysis of Major Economic Characters in Japonica Rice Landrace from Taihu Lake Region

5个太湖粳稻地方品种和2个现代粳稻品种进行完全双列杂交。利用主位点组加性-显性模型,采用向前逐步回归方法,对水稻7个主要经济性状进行遗传分析。结果表明:千粒重、实粒数和穗长3个性状的遗传变异符合2个主位点组+微位点组的遗传模型;有效穗、总粒数、结实率和着粒密度等性状的变异符合3个主位点组+微位点组遗传模型控制。在决定水稻主要经济性状的遗传变异中,加性效应和显性效应共同起作用。

The seven japonica rice cultivars including five japonica rice landraces from Taihu lake region and two commercial rice cultivars were used to design one experiment of complete diallei cross. A genetic model of major loci group for dominant-additive effects was used to decompose the genotype of parents and their crosses. The results showed that the inheritance of 1000-grain weight, filled spikelets numbers per panicle and panicle length are controlled by two major loci groups and minor loci groups, while effective panicle numbers, total spikelets numbers per panicle, seed setting rate and grain density are controlled by three major loci groups and minor loci groups. The genetic variations of major economic traits of rice are explained by both additive effect and dominant effect.