玉米常用自交系主要经济性状遗传距离的研究

<正> 合理的选配亲本是玉米杂交种具有最大优势的首要条件,而选配亲本经常使用的原则之一是双亲遗传差异大,如何确定其差异,多年来,一些人认为地理远缘是遗传差异的主要标志。因此主张用地理远缘作为选配亲本的条件之一。但据Moll.R.W.et al(1962)及Bhatt,G.M.(1970)等人的研究,发现地理分布和遗传差异并无直接的联系。毛盛贤等

THE PRIMARY STUDY ON GENETIC DISTANCE FOR MAJOR COMPONENT TRAITS OF YIELD IN INBREDS OF MAIZE

Genetic divergence is a technical guideline in selecting parental line for hybridization in plant breeding. What is the genetic divergence? Generally speaking, the varieties or lines from geographically diverse localities are generally included in hybridization programmes presuming genetic diversity. However, This is an inferential criterion, and it cannot be successfully utilized for discrimination between parents. There are few reports avaiable on this aspect in inbreds of maize. Therefore, in the present investigation attempt was made to ascertain the nature and magnitude of diversity among a set of inbreds of maize by estimating the genetic distance (D~2). Experimental results showed that it was in some degree similar to practice of plant breeding. But the inbreds of maize within one class are not very consistent with geographically localities.