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Genome-wide analyses of metal tolerance protein genes in apple (Malus domestica): Identification, characterization, expression and response to various metal ion stresses

文献类型： 外文期刊

作者： Qi, Dazhuang 1 ; Wang, Limin 1 ; Liang, Meixia 1 ; Zhang, Qing 1 ; Tang, Xiaoli 1 ; Geng, Bing 3 ; Qiao, Xuqiang 1 ; Zhang, Hongxia 1 ;

作者机构： 1.Ludong Univ, Engn Res Inst Agr & Forestry, 186 Hongqizhong Rd, Yantai 264025, Shandong, Peoples R China

2.Ludong Univ, Coll Agr, 186 Hongqizhong Rd, Yantai 264025, Shandong, Peoples R China

3.Shandong Inst Sericulture, 21 Zhichubei Rd, Yantai 264001, Shandong, Peoples R China

4.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Hainan Key Lab Biosafety Monitoring & Mol Breeding, 4 Xueyuan Rd, Haikou 571101, Hainan, Peoples R China

5.Ludong Univ, Abiot Resistant Plants, Key Lab Mol Module Based Breeding High Yield, Univ Shandong, 186 Hongqizhong Rd, Yantai 264025, Shandong, Peoples R China

关键词： Malus domestica; Metal tolerance protein; Phylogenetic analysis; Gene expression

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：6.028； 五年影响因子：6.246 ）

ISSN： 0098-8472

年卷期： 2022 年 201 卷

页码：

收录情况： SCI

摘要： The growth and production of fruit trees are adversely affected by heavy metal pollution in orchard lands. Plant metal homeostasis and resistance are regulated by metal tolerance proteins (MTP), which function as divalent cation transporters. To understand the possible role of MTPs in fruit trees, we identified 20 MdMTPs in the apple genome. Phylogenetic and collinear relationship analyses revealed that they belonged to Zn-MTP, Fe/Zn-MTP and Mn-MTP subfamilies, and have gone through two tandem and six segmental duplication events under purifying selection. All MdMTPs were predicted to form homodimer, with each monocase containing a conserved cation efflux domain (CED), the typical structural feature of MTP family, and one or two HXXXD or DXXXD residues. Further spatiotemporal expression analyses indicated that all MdMTP genes were ubiquitously expressed, and most of them were induced by at least three heavy metal ions, in roots, stems or leaves. Yeast and Arabidopsis mutant complementation experiments verified the function of MdMTP11.1 in response to heavy metal stress. Our findings provide an important genetic foundation for the functional elucidation of MdMTP genes, which can be used as the potential gene candidates for the breeding of new fruit tree cultivars with improved tolerance to heavy metal stress.

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