Overexpression of Iris. lactea var. chinensis metallothionein IIMT2a enhances cadmium tolerance in Arabidopsis thaliana
文献类型: 外文期刊
作者: Gu, Chun-Sun 1 ; Liu, Liang-qin 3 ; Zhao, Yan-Hai 1 ; Deng, Yan-ming 4 ; Zhu, Xu-dong 3 ; Huang, Su-Zhen 1 ;
作者机构: 1.Inst Bot, Nanjing 210014, Jiangsu, Peoples R China
2.Chinese Acad Sci, Nanjing 210014, Jiangsu, Peoples R China
3.Nanjing Agr Univ, Coll Hort, Nanjing 210014, Jiangsu, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Agrobiotechnol, Nanjing 210014, Jiangsu, Peoples R China
关键词: Arabidopsis;Metallothionein;Iris. lactea var. chinensis;Cadmium stress;Reactive oxygen species
期刊名称:ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY ( 影响因子:6.291; 五年影响因子:6.393 )
ISSN: 0147-6513
年卷期: 2014 年 105 卷
页码:
收录情况: SCI
摘要: Metallothioneins (MTs) are cysteine-rich, low molecular weight, heavy metal-binding protein molecules. Here, a full-length cDNA homologue of MT2a (type 2 metallothionein) was isolated from the cadmiumtolerant species Iris. lactea var. chinensis (I. lactea var. chinensis). Expression of IIMT2a in I. lactea var. chinensis roots and leaves was up-regulated in response to cadmium stress. When the gene was constitutively expressed in Arabidopsis thaliana (A. thaliana), root length of transgenic lines was longer than that of wild-type under 50 mu M or 100 mu M cadmium stress. However, there was no difference of cadmium absorption between wild-type and trangenic lines. Histochemical staining by 3,3-diamino-benzidine (DAB) and nitroblue tetrazoliu (NBT) clearly demonstrated that transgenic lines accumulated remarkably less H2O2 and O-2(center dot-) than wild-type. Together, IIMT2a may be a promising gene for the cadmium tolerance improvement. (C) 2014 Elsevier Inc. All rights reserved.
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