NDLI: AREB1 Is a Transcription Activator of Novel ABRE-Dependent ABA Signaling That Enhances Drought Stress Tolerance in Arabidopsis W⃞ 111111111111111111111111100000000000000000000001100001111000000001000001100010000100000010100001100100000010000010100001101000000001000100010001101000000001000100010001101000000001001111111001101000000001001000001001100100000010001000001001100010000100010000000101100001111000010000000101100000000000000000000001111111111111111111111111

Content Provider	PubMed Central
Author	Fujita, Yasunari Fujita, Miki Satoh, Rie Maruyama, Kyonoshin Parvez, Md. M. Seki, Motoaki Hiratsu, Keiichiro Ohme-takagi, Masaru Shinozaki, Kazuo Yamaguchi-shinozaki, Kazuko
Copyright Year	2005
Abstract	ABSCISIC ACID–RESPONSIVE ELEMENT BINDING PROTEIN1 (AREB1) (i.e., ABF2) is a basic domain/leucine zipper transcription factor that binds to the abscisic acid (ABA)–responsive element (ABRE) motif in the promoter region of ABA-inducible genes. Here, we show that expression of the intact AREB1 gene on its own is insufficient to lead to expression of downstream genes under normal growth conditions. To overcome the masked transactivation activity of AREB1, we created an activated form of AREB1 (AREB1ΔQT). AREB1ΔQT-overexpressing plants showed ABA hypersensitivity and enhanced drought tolerance, and eight genes with two or more ABRE motifs in the promoter regions in two groups were greatly upregulated: late embryogenesis abundant class genes and ABA- and drought stress–inducible regulatory genes. By contrast, an areb1 null mutant and a dominant loss-of-function mutant of AREB1 (AREB1:RD) with a repression domain exhibited ABA insensitivity. Furthermore, AREB1:RD plants displayed reduced survival under dehydration, and three of the eight greatly upregulated genes were downregulated, including genes for linker histone H1 and AAA ATPase, which govern gene expression and multiple cellular activities through protein folding, respectively. Thus, these data suggest that AREB1 regulates novel ABRE-dependent ABA signaling that enhances drought tolerance in vegetative tissues.
Related Links	http://dx.doi.org/10.1105/tpc.105.035659
Ending Page	3488
Page Count	19
Starting Page	3470
File Format	PDF
ISSN	10404651
e-ISSN	1532298X
Journal	The Plant Cell
Issue Number	12
Volume Number	17
Language	English
Publisher	American Society of Plant Biologists
Publisher Date	2005-12-01
Access Restriction	Open
Rights Holder	American Society of Plant Biologists
Subject Keyword	Plant Science Cell Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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