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      Drought and Salt Tolerance in Plants

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      Critical Reviews in Plant Sciences
      Informa UK Limited

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          Role of plant heat-shock proteins and molecular chaperones in the abiotic stress response.

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            Plant salt tolerance

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              DNA-binding specificity of the ERF/AP2 domain of Arabidopsis DREBs, transcription factors involved in dehydration- and cold-inducible gene expression.

              DRE/CRT is a cis-acting element that is involved in gene expression responsive to drought and low-temperature stress in higher plants. DREB1A/CBF3 and DREB2A are transcription factors that specifically bind to DRE/CRT in Arabidopsis. We precisely analyzed the DNA-binding specificity of DREBs. Both DREBs specifically bound to six nucleotides (A/GCCGAC) of DRE. However, these proteins had different binding specificities to the second or third nucleotides of DRE. Gel mobility shift assay using mutant DREB proteins showed that the two amino acids, valine and glutamic acid conserved in the ERF/AP2 domains, especially valine, have important roles in DNA-binding specificity. In the Arabidopsis genome, 145 DREB/ERF-related proteins are encoded. These proteins were classified into five groups-AP-2 subfamily, RAV subfamily, DREB subfamily, ERF subfamily, and others. The DREB subfamily included three novel DREB1A- and six DREB2A-related proteins. We analyzed expression of novel genes for these proteins and discuss their roles in stress-responsive gene expression.

                Author and article information

                Journal
                Critical Reviews in Plant Sciences
                Critical Reviews in Plant Sciences
                Informa UK Limited
                0735-2689
                1549-7836
                February 23 2005
                February 23 2005
                : 24
                : 1
                : 23-58
                Article
                10.1080/07352680590910410
                302d1679-46b0-43f5-a73f-cdd624987393
                © 2005
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