Transcription Factor CBF4 Is a Regulator of Drought Adaptation in Arabidopsis
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ID: 305913
2002
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Abstract
Abstract In plants, low temperature and dehydration activate a set of genes containing C-repeat/dehydration-responsive elements in their promoter. It has been shown previously that the Arabidopsis CBF/DREB1 transcription activators are critical regulators of gene expression in the signal transduction of cold acclimation. Here, we report the isolation of an apparent homolog of the CBF/DREB1 proteins (CBF4) that plays the equivalent role during drought adaptation. In contrast to the three already identified CBF/DREB1 homologs, which are induced under cold stress, CBF4 gene expression is up-regulated by drought stress, but not by low temperature. Overexpression of CBF4 in transgenic Arabidopsis plants results in the activation of C-repeat/dehydration-responsive element containing downstream genes that are involved in cold acclimation and drought adaptation. As a result, the transgenic plants are more tolerant to freezing and drought stress. Because of the physiological similarity between freezing and drought stress, and the sequence and structural similarity of the CBF/DREB1 and the CBF4 proteins, we propose that the plant's response to cold and drought evolved from a common CBF-like transcription factor, first through gene duplication and then through promoter evolution.
| Reference Key |
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| Authors | Volker Haake, Daniel Cook, José Luis Riechmann, Omaira Pineda, Michael F. Thomashow, James Z. Zhang |
| Journal | Plant physiology and biochemistry : PPB |
| Year | 2002 |
| DOI |
10.1104/pp.006478
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| URL | |
| Keywords | Keywords not found |
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