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本试验通过对两组不完全双列杂交(6×5和4×3)组合的F_2、F_3及B_1等群体的育性分离情况的观察和分析,初步认为杂交水稻育性茎因型因组合不同而不尽一致。有些组合只具有隐性不育基因,另一些组合则既具有隐性不育基因,也具有显性不育基因,显性可育基因对显性不育基因表现出遮盖作用。隐性不育基因数在组合问的变异主要决定于不育系,而显性不育基因数的变异则主要决定于恢复系。作用育性基因数和显性不育基因数与F_1结实率呈显著负相关。本文还提出了根据已知育性基因型求F_2、B_1和F_3等群体的理论不育株率的公式,以及根据各群体的不育株数和样本容量估算其育性基因型的方法。
In this study, we observed and analyzed the fertility segregation of F_2, F_3 and B_1 inbred lines (6 × 5 and 4 × 3) Different but not consistent. Some combinations have recessive sterility genes only, while others have both recessive and dominant genes. Dominant and fertile genes have a masking effect on dominant-negative genes. The number of recessive sterility genes in the combinations is mainly determined by the CMS line, while the dominant male sterile line number is mainly determined by the restorer line. The number of fertility gene and dominant male sterile gene was negatively correlated with F 1 seed setting rate. This paper also proposed the formula for calculating the theoretical rate of sterile plants of F_2, B_1 and F_3 populations based on the known genotypes of fertility and the method of estimating fertility genotypes according to the number of sterile plants and sample size of each population.