CarNAC4, a NAC-type Chickpea Transcription Factor Conferring Enhanced Drought and Salt Stress Tolerances in Arabidopsis

Overview

Journal Plant Cell Rep

Publisher Springer

Date 2015 Dec 10

PMID 26650836

Citations 43

Authors

Xingwang Yu

Yanmin Liu

Shuang Wang

Yuan Tao

Zhankui Wang

Yingjie Shu

Hui Peng

Abudoukeyumu Mijiti

Ze Wang

Hua Zhang

Hao Ma

Affiliations

Soon will be listed here.

Abstract

CarNAC4 is a typical stress-responsive NAC transcription factor and enhances drought and salt stress tolerances in transgenic Arabidopsis. Chickpea (Cicer arietinum L.) is relatively vulnerable to abiotic stress conditions, but the tolerance mechanisms for such stresses in chickpea are largely unknown. To identify stress-related factors in chickpea, we previously constructed a cDNA library of chickpea leaves exposed to drought stress conditions. A cDNA encoding a putative NAC transcription factor (CarNAC4) was identified as a putative stress-responsive gene. Our study indicated that the transcript levels of CarNAC4 were enhanced in response to several abiotic stresses and phytohormones. Promoter analysis demonstrated that multiple stress-related cis-acting elements exist in promoter region of CarNAC4. CarNAC4 is localized in the nucleus and binds to the DNA sequence containing CGT[G/A], while the C-terminal region of CarNAC4 contains a transcriptional activation domain. Over-expression of CarNAC4 in Arabidopsis plants improved tolerance to drought and salt stresses. Transgenic plants exhibited greater reduced rates of water loss and more proline accumulation than Col-0 plants under drought stress and less MDA contents than Col-0 plants under salt stress. In addition, over-expression of CarNAC4 enhanced the expression of stress-responsive genes such as RD29A, ERD10, COR15A, COR47, KIN1 and DREB2A. These results indicated that CarNAC4 functions as a transcription factor involved in the regulation of drought and salt stress response.

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