~(60)Co γ射线对沙打旺细胞遗传学效应和M_2性状变异的影响

本文从细胞遗传以及出苗率、苗高、M_1显性突变和M_2性状突变等方面阐述了沙打旺的辐射诱变规律。试验结果指出:苗高和出苗率与剂量呈负相关;染色体畸变和微核率与剂量相关性显著;M_2性状突变与剂量大小有关,同时发现不同品种间的辐射敏感性差异较大。在M_1中发现了显性突变,井选出比对照早开花51禾的早熟类型,为在黄土高原高寒地区实现沙打旺的天然更新提供了可能性。

EFFECTS OF ~(60)Co GAMMA RAYS ON MUTATION OF M_2 IN ATRAGALUS ADSURGENS PALL

The effed of radiation in Astragalus adsurgens Pall had been discused concerning chromosome aberration,field germinaton,seedling height,dominant mutation of M1 and morphological mutation of M2 in this paper.Ex-perimentd results indicated that seedling height and field germination decreased while chromosome aerration and frequency of micronucleus increased with increasing radiation dose.There was a close correlation between the morphological mutation of M2 and radiation dose.The radiosensitivity of different varieties was apparently different.Dominant mutation had been found in M1 generation.Early-maturing mutant flowered 45 days earlier than the control.