【摘要】 对两个玉米群体完成了两轮特殊配合力的轮回选择。结果表明:两个群体一般配合力、特殊配合力和群体本身均获得了明显的遗传进展,根据原始测验种测交选择所获得的遗传增益并不因用其它测验种测配而丧失。因此,在轮选过程中,中途更换测验种仍可将群体已获得的大部分配合力遗传下去;遗传基础较丰富的群体一般配合力进展大于遗传基础较窄的群体,说明组建遗传基础丰富的原始群体是提高轮回选择效果的关键;轮回选择能够改良群体的原因在于提高优良基因频率,淘汰低劣基因型个体,维持群体内的一定变异,协调各性状间的制约关系等。更多还原

【Abstract】 Two cycles of recurrent selection for specific combining abilitywere completed in two maize populations.The significant genetic progress was made in general,specific combining ability ofboth populationsas well as in the population themselves,which suggested that originaltesters can be replaced by other one without harmful results relative tothe genetic gains obtained by the original testers.The greater progressin general combining ability was made in the rich genetic basic populationthan in the narrow genetic basic population,which showed that one ofthe cruxes for the increasing of the effect of recurrent selection was thedeveloping of the original population with a rich genetic basis.The mainreason why the populations had been improved by recurrent selectionwas the increasing of the frequancies of favourable genes,the eliminating of the individuals with deleterious genes,the maintaining of the variation of population in definite range and coordinating of the restrictrelationship among various traits.更多还原