论文部分内容阅读
以籽粒苋种子为试材,采用搭载第18颗返回式卫星和~(60)Co-γ射线2种方法诱变处理籽粒苋种子,研究了种子根尖细胞学效应。结果表明:太空诱变对籽粒苋的根尖细胞有丝分裂活动无明显影响,γ射线辐照抑制了籽粒苋根尖细胞的有丝分裂,根尖细胞有丝分裂指数并随着γ射线剂量的增加逐渐降低。经卫星搭载和γ射线辐照后,籽粒苋种子根尖细胞均出现了包括微核、桥、落后染色体、游离染色体、粘连染色体等染色体畸变类型,单微核是主要畸变类型。第18颗返回式卫星搭载的辐射剂量相当于~(60)Co-γ射线辐照20~30Gy。
Grain amaranth seeds were used as materials to mutagenize the seeds of amaranth by using the 18th return satellites and ~ (60) Co-γ rays. The root apical cytology of the seeds was studied. The results showed that space mutagenesis had no significant effect on mitochondrial mitochondrial mitochondrial mitochondrial activity in root tips of grain amaranth. Γ-ray irradiation inhibited the mitosis of root cells and the mitotic index of root tip cells, and decreased with the increase of γ-ray dose. After satellite-mount and γ-ray irradiation, chromosome aberrations such as micronuclei, bridges, backward chromosomes, free chromosomes and adhesional chromosomes appeared in root tip cells of grain amaranth, and the single micronucleus was the main type of distortion. The 18th returning satellite carries a radiation dose equivalent to ~30 Gy of ~ (60) Co-γ radiation.