BnaABF2, a bZIP transcription factor from rapeseed (Brassica napus L.), enhances drought and salt tolerance in transgenic Arabidopsis

ZHAO Biyan; HU Yufeng; LI Juanjuan; WU Gaobing; YAO Xuan

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BnaABF2, a bZIP transcription factor from rapeseed (Brassica napus L.), enhances drought and salt tolerance in transgenic Arabidopsis

ZHAO Biyan,HU Yufeng,LI Juanjuan,WU Gaobing,YAO Xuan *

College of plant science and technology, Huazhong Agricultural University, Wuhan 430070

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China （No.20120146120013, 20120146120014）

Opened online:20 May 2016

Accepted by: none

Citation: ZHAO Biyan,HU Yufeng,LI Juanjuan.BnaABF2, a bZIP transcription factor from rapeseed (Brassica napus L.), enhances drought and salt tolerance in transgenic Arabidopsis[OL]. [20 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4688731

Abiotic stresses such as drought and salt stresses have a negative affection the growth and productivity of plants. Improvement of stress tolerance through genetic engineering in plants has been reported in intense studies. Transcription factors play vital roles in plant adaptation to stresses by regulating expression of a great deal of target genes. A family of Arabidopsis basic region leucine zipper (bZIP) transcription factors that can recognize and bind to the abscisic acid (ABA)-responsive elements (ABREs) in promoter is named as ABRE binding factors (ABFs)/ABRE binding proteins (AREBs). They play a key role in the regulation of expression of downstream stress-responsive genes in ABA signalling. Genetic transformation of ABF/ABRE transcription factors has been suggested to be an effective approach for engineering stress-tolerant plants. However, whether the ABF/ABRE transcription factors are able to be used for generating stress-tolerant rapeseed plants has not yet been studied.BnaABF2, encoding a basic region leucine zipper (bZIP) transcription factor, was cloned from rapeseed in this study. Subcellular localization and transactivation analyses showed that BnaABF2 was localized to the nucleus with transactivation activity in plant cells. BnaABF2 gene expression was induced by drought and salt stresses and BnaABF2 positively functions in ABA signalling during the vegetative stage. Overexpression of BnaABF2 was found to render drought and salt tolerance to Arabidopsis plants. The resistance of the BnaABF2-expressing transgenic plants to drought and salt stresses is due to reduced water-loss rate and expression of stress-responsive genes such as RD29B, RAB18 and KIN2. The expression of RD29B, RAB18 and KIN2 regulated by BnaABF2 is involved in an ABA-dependent stress signalling.

Keywords:Plant stress resistance; BnaABF2; bZIP transcription factor; Rapeseed

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