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Overexpression of a peanut NAC gene, AhNAC4, confers enhanced drought tolerance in tobacco

文献类型： 外文期刊

作者： Tang, G. Y. 1 ; Shao, F. X. 2 ; Xu, P. L. 1 ; Shan, L. 1 ; Liu, Z. J. 3 ;

作者机构： 1.Shandong Acad Agr Sci, Biotech Res Ctr, Shandong Prov Key Lab Crop Genet Improvement Ecol, Jinan 250100, Peoples R China

2.Shandong Normal Univ, Sch Life Sci, Jinan 250358, Peoples R China

3.Shandong Acad Agr Sci, Shandong Cotton Res Ctr, Jinan 250100, Peoples R China

关键词： Arachis hypogaea;NAC transcription factor;transgenic tobacco;drought tolerance

期刊名称：RUSSIAN JOURNAL OF PLANT PHYSIOLOGY （ 影响因子：1.481； 五年影响因子：1.608 ）

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收录情况： SCI

摘要： NAC is one of the most abundant plant-specific groups of transcription factors, which play important roles in plant growth and development regulation, as well as in biotic and abiotic stress responses. In the present study, a stress-responsive NAC gene, AhNAC4, was isolated from a cDNA library of peanut (Arachis hypogaea L.) immature seeds, and characterized for its role in drought tolerance. AhNAC4 shared high amino acid similarity with NAC proteins belonging to the ATAF subfamily. The expression analysis indicated that AhNAC4 was highly induced by drought, salinity and ABA treatments. Transient expression analysis showed the AhNAC4-GFP fusion protein was exclusively localized in the nucleus of onion epidermal cells. Transactivation assays in yeast cells demonstrated that AhNAC4 functioned as a transcription activator and its C-terminus contained the activation domain. Overexpression of AhNAC4 confers enhanced drought tolerance in transgenic tobacco plants. The improved drought tolerance was associated with more stomatal closure and higher water use efficiency. Collectively, our results indicated that AhNAC4 functions as an important regulator in response to drought stress.

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