MsZEP, a novel zeaxanthin epoxidase gene from alfalfa (Medicago sativa), confers drought and salt tolerance in transgenic tobacco

被引：103

作者：

Zhang, Zhiqiang ^{[1
]}

Wang, Yafang ^{[1
]}

Chang, Leqin ^{[1
]}

Zhang, Tong ^{[1
]}

An, Jie ^{[1
]}

Liu, Yushi ^{[1
]}

Cao, Yuman ^{[1
]}

Zhao, Xia ^{[1
]}

Sha, Xuyang ^{[1
]}

Hu, Tianming ^{[1
]}

Yang, Peizhi ^{[1
]}

机构：

[1] Northwest A&F Univ, Dept Grassland Sci, Coll Anim Sci & Technol, Yangling 712100, Shaanxi, Peoples R China

来源：

PLANT CELL REPORTS | 2016年 / 35卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Abscisic acid; Drought; Medicago sativa; Nodule; Salt; Overexpression; ABSCISIC-ACID BIOSYNTHESIS; INDUCED OXIDATIVE STRESS; WATER-DEFICIT STRESS; HIGH-TEMPERATURE; MOLECULAR-CLONING; ABA BIOSYNTHESIS; RESPONSIVE GENE; ARABIDOPSIS; EXPRESSION; OVEREXPRESSION;

D O I：

10.1007/s00299-015-1895-5

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Zeaxanthin epoxidase (ZEP) plays important roles in plant response to various environment stresses due to its functions in ABA biosynthetic and the xanthophyll cycle. To understand the expression characteristics and the biological functions of ZEP in alfalfa (Medicago sativa), a novel gene, designated as MsZEP (KM044311), was cloned, characterized and overexpressed in Nicotiana tabacum. The open reading frame of MsZEP contains 1992 bp nucleotides and encodes a 663-amino acid polypeptide. Amino acid sequence alignment indicated that deduced MsZEP protein was highly homologous to other plant ZEP sequences. Phylogenetic analysis showed that MsZEP was grouped into a branch with other legume plants. Real-time quantitative PCR revealed that MsZEP gene expression was clearly tissue-specific, and the expression levels were higher in green tissues (leaves and stems) than in roots. MsZEP expression decreased in shoots under drought, cold, heat and ABA treatment, while the expression levels in roots showed different trends. Besides, the results showed that nodules could up-regulate the MsZEP expression under non-stressful conditions and in the earlier stage of different abiotic stress. Heterologous expression of the MsZEP gene in N. tabacum could confer tolerance to drought and salt stress by affecting various physiological pathways, ABA levels and stress-responsive genes expression. Taken together, these results suggested that the MsZEP gene may be involved in alfalfa responses to different abiotic stresses and nodules, and could enhance drought and salt tolerance of transgenic tobacco by heterologous expression.

引用

页码：439 / 453

页数：15

共 66 条

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