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镉胁迫对蚕豆幼苗基因组DNA多态性的影响

解莉婧1,2;刘宛1;李培军1;李淑芹2;王菲1;齐雪梅1;臧淑艳1   

  1. 1中国科学院沈阳应用生态研究所, 沈阳 110016;
    2东北农业大学资源与环境学院,哈尔滨 150030
  • 收稿日期:2006-08-24 修回日期:2006-10-11 出版日期:2007-01-10 发布日期:2007-01-10

Effects of cadmium stress on DNA polymorphism of genome in Vicia faba seedlings

XIE Li-jing1,2;LIU Wan1;LI Pei-jun1;LI Shu-qin2;WANG Fei1;QI Xue-mei1;ZANG Shu-yan1   

  1. 1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;
    2College of Resources and Environment Sciences, Northeast Agricultural University, Harbin 150030, China

  • Received:2006-08-24 Revised:2006-10-11 Online:2007-01-10 Published:2007-01-10

摘要: 采用随机扩增多态性DNA (RAPD)技术检测镉(Cd)胁迫对蚕豆幼苗根尖DNA多态性的影响。结果表明,不同浓度(2.5、5和15 mg·L-1)镉处理7 d后,蚕豆幼苗根伸长及根系中可溶性蛋白质含量均受到了抑制。选用12条寡核苷酸引物(10 bp)对蚕豆幼苗根尖细胞中基因组DNA进行RAPD扩增,其中有6个引物产生特异性PCR产物。对照组蚕豆幼苗根尖基因组DNA的RAPD图谱中可分辨出86条RAPD谱带,其分子量为200~2 520 bp。处理组与对照组RAPD图谱之间存在明显差异,且与镉浓度之间存在剂量效应关系。这些结果表明,镉影响蚕豆幼苗根尖细胞中基因组模板的稳定性,故利用RAPD技术获得的DNA多态性变化可作为检测镉遗传毒性效应的生物标记物。

关键词: 禾草, 生活型, 发芽率, 杂草, 干扰

Abstract: By using random amplified polymorphic DNA (RAPD) technique, this paper studied the effects of Cd stress on DNA polymorphism in root tip of Vicia faba seedlings. The results showed that after 7 days of 2.5-15 mg Cd·L-1 stress, the root elongation growth was inhib-ited, and the total soluble protein content in root tip was decreased. A total of six oligonucleotide primers (10 bp) were found to produce unique polymorphic band patterns, and subsequently used to produce 86 bands of 200-2 520 bp in molecular size in the normal root tip of V. faba seedlings. The RAPD profiles showed obvious differences between normal and exposed plantlets, and the change effect was dose-dependent. The genomic template stability was significantly af-fected by Cd pollution, and the DNA polymorphisms detected by RAPD technique could be used as a biomarker for detecting the genotoxic effects of Cd stress on plants.

Key words: Grass, Life form, Germination rates, Ruderals, Disturbance