Genome-wide analysis of ethylene-response factor family in adzuki bean and functional determination of VaERF3 under saline-alkaline stress

• Published in: Plant physiology and biochemistry Vol. 147; pp. 215 - 222
• Main Authors: Li, Wei-yu, Wang, Cheng, Shi, Heng-hua, Wang, Bo, Wang, Jing-xuan, Liu, Yu-shu, Ma, Jing-yu, Tian, Sen-ya, Zhang, Yao-wen
• Format: Journal Article
• Language: English
• Published: France Elsevier Masson SAS 01.02.2020
• Subjects: Abscisic Acid - pharmacology; Adzuki bean; Arabidopsis - genetics; ERFs; Ethylenes - pharmacology; Gene Expression Regulation, Plant - drug effects; Genome-Wide Association Study; Peptide Termination Factors - genetics; Peptide Termination Factors - metabolism; Plant Proteins - genetics; Plant Proteins - metabolism; Plants, Genetically Modified - genetics; Plants, Genetically Modified - metabolism; Polyethylene Glycols - pharmacology; Saline-alkaline stress; Sodium Bicarbonate - pharmacology; Sodium Chloride - pharmacology; Stress, Physiological - genetics; Vigna - genetics; Vigna - metabolism; Adzuki bean; ERFs; Saline-alkaline stress
• ISSN: 0981-9428; 1873-2690
• DOI: 10.1016/j.plaphy.2019.12.019

Ethylene-response factor (ERF) proteins are members of a transcription factor family involved in plant growth and environmental stress responses, but the biological functions of ERF members in adzuki bean (Vigna angularis var. angularis) remain unknown. In addition, it is unclear whether these proteins have a role in regulating responses to abiotic stressors. Here, we identified 47 ERF genes by analyzing the adzuki bean genome. Whole-transcriptome analyses of plants under saline-alkaline stress suggested that the expression of 13 ERF genes was induced in response to saline-alkaline stress. Analysis of the cis-acting elements showed that the promoters of these saline-alkaline stress-inducible ERF genes contained LTRs, DREs, MYBs, ABREs, MYCs, CGTCA-, and TGACG-motifs, which are involved in abiotic stress responses. The expression of VaERF3 was induced by NaHCO3, polyethylene glycol 6000, NaCl, and ABA (abscisic acid), as determined by qRT-PCR. Overexpression of VaERF3 in transgenic Arabidopsis resulted in higher levels of proline accumulation and lower malondialdehyde and reactive oxygen species contents in plants grown under saline-alkaline stress conditions. Moreover, VaERF3 encoded a nuclear-localized transcriptional activator that promoted the expression of stress-responsive genes. Collectively, these results are of great significance in elucidating the mechanisms of saline-alkaline stress responses in adzuki bean. •The biological functions of ERF members in Adzuki bean remain unknown.•VaERF3 encoded a nuclear localized transcriptional activator.•VaERF3 promoted stress-responsive genes expression.