【摘要】 本试验用 Co60γ射线照射高粱晋粱五号、Tx622B、关东青、同源四倍体。M₂按 M₁结实率四个等级种成穗行,测定 M₁结实率和 M₂各类突变频率的关系,结果表明,M₁生理损伤效应和 M₂突变频率及突变谱有一定的关联性。苗期叶绿素突变频率随着 M₁结实率的提高而增高,呈正相关（r=+0.9783）;早熟突变频率随着 M₁结实率的提高而降低,呈负相关（r=-0.70565）;总突变频率呈极显著负相关（r=-0.9056）;结实率与其他类型突变率无关。通过 M₁和 M₂代经济性状与对照相互比较,表明 M₁结实率和千粒重二者呈正相关,但 M₂代不同结实率级别的千粒重增减程度又不相同。这些结果予示在辐射育种中,选择 M₁结实率较低的穗,可以大大缩小 M₂代种植群体并提高选择效果。更多还原

【Abstract】 In this experiment gamma rays C060 irradiated sorghum Jin-liang wu hao,guan dong qinng and homologous tetraploid.According to earhead be- aring rate,the M₁ were divided into four ranks and M₂ were sown in ear- head lines.The determination of relationship between the bearing rate of M₁ and the mutation frequency of M₂ showned that physiological damages of M₁ had a connection with mutation frequency and mutational spectrum of M₂.The chlorophyll mutational frequencies in seeding period in propor- tion to the enhance of bearing rate of M₁.They were positive correlation （r=+0.9783）.The frequencies of early ripe mutants were reduced as bea- ring rate of M₁ increased.They were negative correlation.Toal mutational frequency was highly significant negative correlation（r=-0.9056）.Bearing rates had no eonnetion with other mutational types. The result suggested that induced mutations in plant breeding,selecting the earheads of lower bearing rate for the M₁ population as sowing seeds for M₂ could reduce the population and raised piching efficiency in M₂.更多还原