过刊浏览

外空飞行后小麦根尖细胞的染色体畸变

李群, 郭房庆, 顾瑞琦, 黄荣庆

中科院上海植物生理研究所.上海 200032；中科院高能物理研究所.北京 100039

摘要

小麦种子在科学探测和技术实验卫星上进行空间飞行,返回地面后浸种萌发,经不同时间培养后取根尖固定并观察根尖细胞染色体畸变情况。空间飞行可引起根尖细胞染色体畸变率的增加,其损伤随取样时间的延后呈下降趋势,说明空间飞行所诱导的染色体损伤可被部分修复;种子经辐射保护剂芥子碱和半胱氨酸预处理能显著降低空间飞行诱发的根尖细胞染色体畸变率,而经辐射敏化剂咖啡因预处理的情况则相反。

关键词： 空间飞行; 染色体畸变; 损伤修复; 空间辐射

Effects of space flight on the chromosome aberrations of wheat root tip cells

Li Qun, Guo Fangqing, Gu Ruiqi, Huang Rongqing

Shanghai Institute of Plant Physiology,The Chinese Academy of Sciences.Shanghai 200032；China

Abstract

Dry seeds of wheat Triticum aestivum L. cv. Yang-mai No. 5 had been aboarded on a satellite in space for 8 days. After space flight the seeds were germinated and cultured under 25 degree C, then the root tips were fixed in different culture times to observe chromosome aberrations. The chromosome aberration frequency of root tip cells increased after space flight and decreased with a delay of fixation time. It has been shown that the chromosome damage induced by space flight could be partly repaired. The pre-flight treated with radiation protector sinapine and cysteine can reduce the chromosome aberrations. However, radiation sensitizer caffeine has the opposite effects. Wheat seeds hit by cosmic HZE-particles show similar results. It showed that cosmic rays are the main factor for inducing the chromosome aberrations by space flight.

Key words: Space flight;Chromosome aberrations;Damage repair;Cosmic rays

收稿日期：　　录用日期：

通讯作者：　　E-mail:

引用本文：

李群, 郭房庆, 顾瑞琦, 黄荣庆. 外空飞行后小麦根尖细胞的染色体畸变[J]. 生理学报 1997; 49 (3): .

Li Qun, Guo Fangqing, Gu Ruiqi, Huang Rongqing. Effects of space flight on the chromosome aberrations of wheat root tip cells. Acta Physiol Sin 1997; 49 (3): (in Chinese with English abstract).