胡麻主要经济性状遗传参数的研究

本文估算了胡麻主要经济性状的广义遗传力、遗传相关系数、遗传进度和选择指数等遗传参数.结果表明;千粒重、株高、工艺长度的遗传力、遗传进度较高,遗传变异系数较大,在早代进行一次选择即可;每果着粒、开花期的遗传力和遗传进度也较高,而变异系数较小.对其也应加强早代选择,并加大选择群体;单株粒数、主茎分枝的遗传力和遗传进度中等,应进行几代连续选择;单株粒重、单株结果的遗传参数值均较小,直接选择效果差,可通过显著相关的性状进行间接选择.特别是对于单株粒重,还可以用相对效率高的选择指数进行间接选择.

A STUDY ON GENETIC PARAMETERS OF MAIN ECONOMIC CHARACTERS IN LINSEED

The genetic parameters such as generalized hereditary capacity, genetic correlation coefficient, genetic advance and selective index in of main economic characterswere evaluated in this paper. The results showed that the plant height, thousand grain weight and technological length are higher in hereditary capacity and genetic advance and their hereditary variation variation coefficient are bigger, so that once is enough in the selection of early generation. The herebitary capacity and the genetic advance of both grain number in each capsule and flowering season are bigger, and their variation coefficients are lower, the selection also lower, the selection also should be strengthened in early generation, and augment the selective population. The plant seed number and the branches of main stem have moderate hereditary capacity an d genetic advance, and several generations should be continuously selected. The genet i c parameters of grain weight and fruiting in single plant are lower. Thus the effect of direct sellection is not very good. It is better to be indirectly selected from the characters significantly correlated with them. In particular, the indirective selection with h-igh relative efficiency could be carried out for the grain weight of single plant.