杂交水稻不同细胞质源的配合力分析

 以6个恢复系做测验系,用系×测验系分析法比较了水稻4个同核异质系[珍汕97B,D(汕)A,G(汕)A和W(汕)A]主要性状的配合力。胞质一般配合力方差(GCA)和特殊配合力方差(SCA)表明,在所测性状中,胞质基因对11个性状、核质互作对6个性状效应明显;不育胞质对多数性状表现负效应,可育胞质表现正效应;大多数性状的核基因组变异大于胞质基因组变异。不育胞质的一般配合力负效应可通过一些育种途径予以降低,胞质基因组是水稻目标性状改良的重要遗传资源。

Combining Ability Analysis of Different Cytoplasm Sources in Hybrid Rice

This paper is concerned in the comparison of combining ability for 19 characters in 4 alloplasmic lines Zhen-Shan 97, D(shan)A, G (shah) A and W (shah) A] which were crossed with 6 restorer lines by 4×6 partial diallel cross design, using line×tester analysis. The significance of cytoplasmic GCA and SCA variances showed the importance of cytoplasmic gene effects and the effects from nucleus-plasm interaction for 11 and 6 traits. The male sterile and fertile cytoplasm revealed negative and positive GCA effects for most of the investigated characters, respectively. The variations of GCA on most of the investigated traits due to nuclear genomes were bigger than that due to cytoplasmic genomes.The negative GCA effects of male sterile cytoplasms on objective traits could be decreased through some breeding methods. These findings indicated that cytoplasmic genomes were important genetic resources in improvement of objective traits in rice.