中国野蚕辐射不育机理的研究

本文从染色体结构变异角度探讨了6 0 Coγ射线照射野蚕蛹造成其后代不育的机理。野蚕的亚不育剂量为 2 50Gy ,在此剂量照射下 ,当代雌虫完全不育 ,雄虫亚不育 ,幼虫生殖细胞染色体产生明显的结构变异 (缺失、倒位等 )。带有此类异常染色体的生殖细胞大多表现为不育 ,这是造成中国野蚕 (BombyxmandarinaMoore)辐射不育的主要原因。

STUDY ON THE RADIATION STERILE MECHANISM OF CHINA MULBERRY WILD SILKWORM

The sterile mechanism of China mulberry wild silkworm ( Bombyx mandorina Moore) was studied on the chromosome structure variation by means of 60 Co γ rays irradiation of the pupae. The dose of sub sterillization for the wild silkworm was 250Gy, under which the females of present generation were whole sterilized and the males were sub sterilized. The chromosome structure variation such as deficiency and inversion of larva reproductive cells could be obviously observed. Most of cells with the abnormal chromosomes were sterilized, which was the main reason or radiation sterilization of Bombyx mandorina Moore.