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Int. J. Mol. Sci. 2015, 16(8), 16750-16762;

Characterization of a Type 1 Metallothionein Gene from the Stresses-Tolerant Plant Ziziphus jujuba

The Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China
Pomology Institute of Shanxi Academy of Agricultural Sciences, Taigu 030815, China
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
Jinguo Museum of Shanxi Province, Linfen 043400, China
Biotechnology Research Center of Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China
Department of Agriculture Shanxi Province, Taiyuan 030002, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Eleftherios P. Eleftheriou
Received: 8 June 2015 / Revised: 7 July 2015 / Accepted: 17 July 2015 / Published: 23 July 2015
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Plant metallothioneins (MTs) are a family of low molecular weight, cysteine-rich, and metal-binding proteins, which play an important role in the detoxification of heavy metal ions, osmotic stresses, and hormone treatment. Sequence analysis revealed that the open-reading frame (ORF) of ZjMT was 225 bp, which encodes a protein composed of 75 amino acid residues with a calculated molecular mass of 7.376 kDa and a predicated isoelectric point (pI) of 4.83. ZjMT belongs to the type I MT, which consists of two highly conserved cysteine-rich terminal domains linked by a cysteine free region. Our studies showed that ZjMT was primarily localized in the cytoplasm and the nucleus of cells and ZjMT expression was up-regulated by NaCl, CdCl2 and polyethylene glycol (PEG) treatments. Constitutive expression of ZjMT in wild type Arabidopsis plants enhanced their tolerance to NaCl stress during the germination stage. Compared with the wild type, transgenic plants accumulate more Cd2+ in root, but less in leaf, suggesting that ZjMT may have a function in Cd2+ retension in roots and, therefore, decrease the toxicity of Cd2+. View Full-Text
Keywords: cadmium; metallothionein; salt tolerance; Ziziphus jujube; ZjMT cadmium; metallothionein; salt tolerance; Ziziphus jujube; ZjMT

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Yang, M.; Zhang, F.; Wang, F.; Dong, Z.; Cao, Q.; Chen, M. Characterization of a Type 1 Metallothionein Gene from the Stresses-Tolerant Plant Ziziphus jujuba. Int. J. Mol. Sci. 2015, 16, 16750-16762.

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