摘要
用^(137)Cs-γ射线辐照籼稻4个单交和2个复交组合的F_1代种子,以常规杂交处理作对照.结合育种实践,研究了M_2F_3代主要经济性状突变频率,有利性状变异率以及M_3F_4代的变异特点和选择效果。结果表明,辐照水稻杂种一代可提高变异率,6个组合M_2F_3主要经济性状突变频率平均比F_3提高6.24％;辐照复交杂种的突变频率大于辐照单交杂种。M_2F_3株高、每穗粒数和千粒重的变幅以及有利性状变异率大于F_3。单交组合M_3F_4性状变异小于F_4,复交组合M_3F_4性状变异大于F_4。表明辐照杂种F_1代性状的分离和稳定与配组方式和杂种的杂合程度有关。M_3F_4优良单株中选率比F_4平均提高0.55％。
The mutagenic effect of major economic characters and favourable variation in M_(2)F_3 , and variated characteristics and selective effect in M_(3)F_4 were studied with early indica rice F_1seeds irradiated by^(137)Cs-γ rays for 4 single and 2 multiple cross combinations. Conventional cross breeding procedures were conducted as being the control with same cross combinations. The result indicated that the mutation frequencies increased in M_(2)F_3 , and average mutation frequency of major economic characters in M_(2)F_3 generation of 6 combinations was 6.24% higher than that in F_ 3 generation. The mutation frequencies of multiple cross seeds treated by radiation were higher than that of single cross. The variation range of plant height, number of grain per panicle and 1000-grain weight and favourable character variation rate in M_(2)F_3 were found to be higher than that in F_3. The range of character in M_(3)F_4 was more narrow than that in F_4 for single cross and greater than that in F_4 for multiple cross. It shows that the segregation and stability of characters in the progenies of F_1 seeds treated by radiation were related to cross manner and heterozygosity of hybrids.
出处
《浙江农业学报》
CSCD
1992年第3期97-102,共6页
Acta Agriculturae Zhejiangensis
