RRC ID |
32210
|
著者 |
Sadhukhan A, Kobayashi Y, Kobayashi Y, Tokizawa M, Yamamoto YY, Iuchi S, Koyama H, Panda SK, Sahoo L.
|
タイトル |
VuDREB2A, a novel DREB2-type transcription factor in the drought-tolerant legume cowpea, mediates DRE-dependent expression of stress-responsive genes and confers enhanced drought resistance in transgenic Arabidopsis.
|
ジャーナル |
Planta
|
Abstract |
MAIN CONCLUSION:VuDREB2A exists in cowpea as a canonical DREB2-type transcription factor, having the ability to bind dehydration-responsive elements in vitro and confer enhanced drought resistance in transgenic Arabidopsis. Cowpea (Vigna unguiculata L. Walp) is an important cultivated legume that can survive better in arid conditions than other crops. But the molecular mechanisms involved in the drought tolerance of this species remain elusive with very few reported candidate genes. The Dehydration-Responsive Element-Binding Protein2 (DREB2) group of transcription factors plays key roles in plant responses to drought. However, no DREB2 ortholog has been reported from cowpea so far. In this study, we isolated and characterized a gene from cowpea, namely VuDREB2A, encoding a protein of 377 amino acids exhibiting features of reported DREB2-type proteins. In cowpea, VuDREB2A transcript accumulation was highly induced by desiccation, heat and salt, but slightly by exogenous abscisic acid (ABA) treatment. We also isolated the VuDREB2A promoter and predicted stress-responsive cis-elements in it using Arabidopsis microarray data. The E. coli-expressed VuDREB2A protein showed binding to synthetic oligonucleotides with Dehydration-Responsive Elements (DREs) from Arabidopsis, in electrophoretic mobility shift assays. Heterologous expression of VuDREB2A in Arabidopsis significantly improved plant survival under drought. In addition, overexpression of a truncated version of VuDREB2A, after removal of a putative negative regulatory domain (between amino acids 132-182) led to a dwarf phenotype in the transgenic plants. Microarray and quantitative PCR analyses of VuDREB2A overexpressing Arabidopsis revealed up-regulation of stress-responsive genes having DRE overrepresented in their promoters. In summary, our results indicate that VuDREB2A conserves the basic functionality and mode of regulation of DREB2A in Arabidopsis and could be a potent candidate gene for the genetic improvement of drought resistance in cowpea.
|
巻・号 |
240(3)
|
ページ |
645-64
|
公開日 |
2014-9-1
|
DOI |
10.1007/s00425-014-2111-5
|
PMID |
25030652
|
MeSH |
Adaptation, Physiological*
Amino Acid Sequence
Arabidopsis
Cloning, Molecular
Droughts
Fabaceae / chemistry
Fabaceae / genetics*
Gene Expression Regulation, Plant*
Molecular Sequence Data
Plant Proteins / genetics
Plant Proteins / isolation & purification
Plant Proteins / metabolism*
Plants, Genetically Modified
Polymerase Chain Reaction
Promoter Regions, Genetic
Transcription Factors / genetics
Transcription Factors / isolation & purification
Transcription Factors / metabolism*
Water / physiology
|
IF |
3.39
|
引用数 |
18
|
WOS 分野
|
PLANT SCIENCES
|
リソース情報 |
シロイヌナズナ / 植物培養細胞・遺伝子 |
sja05800 |