本试验采用~(60)Coγ射线和快中子照射西德小冠花根蘖芽,对其毒性突变率和遗传稳定性进行了研究。结果表明,M_1出现毒性突变,有高毒类型和低毒类型。在M_2中,大多数毒性突变体遗传性不稳定,稳定型出现几率较低,仅占2.0—12.9％。已选出的低毒突变体,其β-硝基丙酸含量为31.7mg/g,是对照含量的48.7—51.4％。通过M_3—M_5鉴定,低毒遗传性基本稳定。 In this study, ~ (60) Coγ-ray and fast neutron irradiation Triticum aurora bud root tillers, its toxicity mutation rate and genetic stability were studied. The results showed that there was a toxic mutation in M_1, with high toxicity and low toxicity. In M_2, most of the virulent mutants were hereditary instability, with a lower probability of stable occurrence, accounting for only 2.0-12.9%. The selected low-toxicity mutant had a β-nitropropionic acid content of 31.7 mg / g, which was 48.7 to 51.4% of the control content. By M_3-M_5 identification, low toxicity and genetic stability.