Arabidopsis Basic Leucine Zipper Proteins That Mediate Stress-Responsive Abscisic Acid Signaling

The phytohormone abscisic acid (ABA) plays an essential role in adaptive stress responses. The hormone regulates, among others, the expression of numerous stress-responsive genes. From various promoter analyses, ABA-responsive elements (ABREs) have been determined and a number of ABRE binding factor...

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Bibliographic Details
Published in:The Plant cell 2002-02, Vol.14 (2), p.343-357
Main Authors: Kang, Joung-youn, Choi, Hyung-in, Im, Min-young, Kim, Soo Young
Format: Article
Language:English
Subjects:
Abscisic Acid - genetics
Abscisic Acid - pharmacology
Adaptation, Physiological - genetics
Adaptation, Physiological - physiology
Arabidopsis - drug effects
Arabidopsis - genetics
Arabidopsis - growth & development
Basic-Leucine Zipper Transcription Factors
Carbohydrates - pharmacology
DNA-Binding Proteins - genetics
G-Box Binding Factors
Gene expression regulation
Gene Expression Regulation, Plant - drug effects
Genes
Germination
Leaves
Leucine Zippers - genetics
Phenotype
Phenotypes
Plant cells
Plant growth
Plant Growth Regulators - genetics
Plant Growth Regulators - pharmacology
Plant Leaves - drug effects
Plant Leaves - growth & development
Plant Roots - drug effects
Plant Roots - growth & development
Plant Transpiration - drug effects
Plants
Plants, Genetically Modified
RNA
Signal Transduction
Sodium Chloride - pharmacology
Transcription Factors - genetics
Transgenic plants
Water - pharmacology
Zinc Fingers - genetics
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Summary:The phytohormone abscisic acid (ABA) plays an essential role in adaptive stress responses. The hormone regulates, among others, the expression of numerous stress-responsive genes. From various promoter analyses, ABA-responsive elements (ABREs) have been determined and a number of ABRE binding factors have been isolated, although their in vivo roles are not known. Here we report that the ABRE binding factors ABF3 and ABF4 function in ABA signaling. The constitutive overexpression of ABF3 or ABF4 in Arabidopsis resulted in ABA hypersensitivity and other ABA-associated phenotypes. In addition, the transgenic plants exhibited reduced transpiration and enhanced drought tolerance. At the molecular level, altered expression of ABA/stress-regulated genes was observed. Furthermore, the temporal and spatial expression patterns of ABF3 and ABF4 were consistent with their suggested roles. Thus, our results provide strong in vivo evidence that ABF3 and ABF4 mediate stress-responsive ABA signaling.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.010362