Role of an Arabidopsis AP2/EREBP-Type Transcriptional Repressor in Abscisic Acid and Drought Stress Responses

The phytohormone abscisic acid (ABA) modulates the expression of many genes important to plant growth and development and to stress adaptation. In this study, we found that an APETALA2/EREBP-type transcription factor, AtERF7, plays an important role in ABA responses. AtERF7 interacts with the protei...

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Bibliographic Details
Published in:The Plant cell 2005-08, Vol.17 (8), p.2384-2396
Main Authors: Song, Chun-Peng, Agarwal, Manu, Ohta, Masaru, Guo, Yan, Halfter, Ursula, Wang, Pengcheng, Zhu, Jian-Kang
Format: Article
Language:English
Subjects:
abscisic acid
Abscisic Acid - metabolism
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - metabolism
Arabidopsis thaliana
binding sites
Complementary DNA
Desiccation
Disasters
drought
Gels
gene expression
gene expression regulation
Genes
Guard cells
Histones
Humans
Plant cells
Polymerase chain reaction
promoter regions
reporter genes
Repression
Repressor Proteins - metabolism
transcription (genetics)
transcription factors
Transcription, Genetic
Transgenic plants
transpiration
Water - analysis
water stress
Yeasts
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Summary:The phytohormone abscisic acid (ABA) modulates the expression of many genes important to plant growth and development and to stress adaptation. In this study, we found that an APETALA2/EREBP-type transcription factor, AtERF7, plays an important role in ABA responses. AtERF7 interacts with the protein kinase PKS3, which has been shown to be a global regulator of ABA responses. AtERF7 binds to the GCC box and acts as a repressor of gene transcription. AtERF7 interacts with the Arabidopsis thaliana homolog of a human global corepressor of transcription, AtSin3, which in turn may interact with HDA19, a histone deacetylase. The transcriptional repression activity of AtERF7 is enhanced by HDA19 and AtSin3. Arabidopsis plants overexpressing AtERF7 show reduced sensitivity of guard cells to ABA and increased transpirational water loss. By contrast, AtERF7 and AtSin3 RNA interference lines show increased sensitivity to ABA during germination. Together, our results suggest that AtERF7 plays an important role in ABA responses and may be part of a transcriptional repressor complex and be regulated by PKS3.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.105.033043