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HbMT2, an ethephon-induced metallothionein gene from Hevea brasiliensis responds to H2O2 stress

文献类型： 外文期刊

作者： Zhu, Jiahong 1 ; Zhang, Quanqi 1 ; Wu, Rui 1 ; Zhang, Zhili 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Key Lab Trop Crop Biotechnol, Minist Agr, Haikou 571101, Peoples R China

2.Hainan Acad Agr Sci, Haikou 571101, Peoples R China

关键词： Hevea brasiliensis;Metallothionein;Ethephon;ROS;H2O2

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2010 年 48 卷 8 期

页码：

收录情况： SCI

摘要： Metallothioneins (MTs) are the cysteine-rich proteins with low molecular weight, which play important roles in maintaining intracellular ion homeostasis, detoxification of heavy metal ions and protecting against intracellular oxidative damages. In this study a novel ethephon-induced metallothionein gene, designated as HbMT2, was isolated and characterized from Hevea brasiliensis. The HbMT2 cDNA contained a 237 bp open reading frame encoding 78 amino acids and the deduced protein showed high similarity to the type 2 MTs from other plant species. Expression analysis revealed more significant accumulation of HbMT2 transcripts in leaves and latex than in roots and barks. The transcription of HbMT2 in latex was strongly induced by ethephon and hydrogen peroxide (H2O2) stress. Overproduction of recombinant HbMT2 protein gave the Escherichia coli cells more tolerance on Cu2+ and Zn2+, and the recombinant HbMT2 could scavenge the reactive oxidant species (ROS) in vitro. All these results indicated that HbMT2 could respond to ethephon stimulation and H2O2 stress as a ROS scavenger in H. brasiliensis. It is also suggested that HbMT2 function in improving the tolerance of rubber trees to heavy metal ions, and repressing the ethephon-induced senilism and tapping panel dryness (TPD) development by ROS scavenge system in H. brasiliensis. (C) 2010 Elsevier Masson SAS. All rights reserved.

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