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Interaction between two cis‐acting elements, ABRE and DRE, in ABA‐dependent expression of Arabidopsis rd29A gene in response to dehydration and high‐salinity stresses

Interaction between two cis‐acting elements, ABRE and DRE, in ABA‐dependent expression of... Many abiotic stress‐inducible genes contain two cis‐acting elements, namely a dehydration‐responsive element (DRE; TACCGACAT) and an ABA‐responsive element (ABRE; ACGTGG/TC), in their promoter regions. We precisely analyzed the 120 bp promoter region (−174 to −55) of the Arabidopsis rd29A gene whose expression is induced by dehydration, high‐salinity, low‐temperature, and abscisic acid (ABA) treatments and whose 120 bp promoter region contains the DRE, DRE/CRT‐core motif (A/GCCGAC), and ABRE sequences. Deletion and base substitution analyses of this region showed that the DRE‐core motif functions as DRE and that the DRE/DRE‐core motif could be a coupling element of ABRE. Gel mobility shift assays revealed that DRE‐binding proteins (DREB1s/CBFs and DREB2s) bind to both DRE and the DRE‐core motif and that ABRE‐binding proteins (AREBs/ABFs) bind to ABRE in the 120 bp promoter region. In addition, transactivation experiments using Arabidopsis leaf protoplasts showed that DREBs and AREBs cumulatively transactivate the expression of a GUS reporter gene fused to the 120 bp promoter region of rd29A. These results indicate that DRE and ABRE are interdependent in the ABA‐responsive expression of the rd29A gene in response to ABA in Arabidopsis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Plant Journal Wiley

Interaction between two cis‐acting elements, ABRE and DRE, in ABA‐dependent expression of Arabidopsis rd29A gene in response to dehydration and high‐salinity stresses

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References (41)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0960-7412
eISSN
1365-313X
DOI
10.1046/j.1365-313X.2003.01708.x
Publisher site
See Article on Publisher Site

Abstract

Many abiotic stress‐inducible genes contain two cis‐acting elements, namely a dehydration‐responsive element (DRE; TACCGACAT) and an ABA‐responsive element (ABRE; ACGTGG/TC), in their promoter regions. We precisely analyzed the 120 bp promoter region (−174 to −55) of the Arabidopsis rd29A gene whose expression is induced by dehydration, high‐salinity, low‐temperature, and abscisic acid (ABA) treatments and whose 120 bp promoter region contains the DRE, DRE/CRT‐core motif (A/GCCGAC), and ABRE sequences. Deletion and base substitution analyses of this region showed that the DRE‐core motif functions as DRE and that the DRE/DRE‐core motif could be a coupling element of ABRE. Gel mobility shift assays revealed that DRE‐binding proteins (DREB1s/CBFs and DREB2s) bind to both DRE and the DRE‐core motif and that ABRE‐binding proteins (AREBs/ABFs) bind to ABRE in the 120 bp promoter region. In addition, transactivation experiments using Arabidopsis leaf protoplasts showed that DREBs and AREBs cumulatively transactivate the expression of a GUS reporter gene fused to the 120 bp promoter region of rd29A. These results indicate that DRE and ABRE are interdependent in the ABA‐responsive expression of the rd29A gene in response to ABA in Arabidopsis.

Journal

The Plant Journal – Wiley

Published: Apr 1, 2003

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