两系法杂交稻主要农艺性状群体遗传变异规律的研究

用4个籼粳两用核不育系与24个广亲和品种进行不完全双列杂交,研究了两系杂交稻13个性状群体配合力方差的遗传变异。结果表明,两系杂交稻的主要农艺性状形成中,既受一般配合力的制约,又受特殊配合力的影响.有效穗、单株产量等5个性状,以一般配合力作用为主。而每穗粒数、千粒重等6个性状,虽仍以一般配合力作用为主,但特殊配合力的作用也不可忽视。每穗一枝梗数和二枝梗数則以特殊配合力作用为主,但一般配合力也有较大作用。有效穗、结实率、生物产量、穗长等4个性状以母本一般配合力作用为主.单株产量、每穗一枝梗数则以父本一般配合力作用为主。其它7个性状则父母本的一般配合力作用均有重要作用。

A PRELIMINARY STUDY OF POPULATION HEREDITARY VARIATION IN TWO-LINE HYBRID RICE

Incomplete diallel crosses were conducted between Four PSGM(photoperiod sensitive geric male sterility)lines and twenty-four varieties of wide compatibility so as to study the hereditary variation in the population combining ability variance of thirteen agronomic characters.The characters studied were shown to be controlled by both general combining ability(g.c.a.)and specific combining ability(s.c.a.),though one or the other may serve as the leading factor.