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The sfr6 mutation in Arabidopsis suppresses low-temperature induction of genes dependent on the CRT/DRE sequence motif.

Knight, H, Veale, E L, Warren, G J, Knight, M R (1999) The sfr6 mutation in Arabidopsis suppresses low-temperature induction of genes dependent on the CRT/DRE sequence motif. The Plant cell, 11 (5). pp. 875-86. ISSN 1040-4651. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)

Abstract

The sfr mutations, which result in sensitivity to freezing after cold acclimation, define genes that are required for freezing tolerance. We tested plants homozygous for mutations sfr2 to sfr7 for cold-induced gene expression and found that sfr 6 plants were deficient in cold-inducible expression of the genes KIN1, COR15a, and LTI78, which all contain the C repeat/dehydration-responsive element (CRT/DRE) motif in their promoters. Similarly, sfr 6 plants failed to induce KIN1 normally in response to either osmotic stress or the application of abscisic acid. In contrast, cold-inducible expression of genes CBF1, CBF2, CBF3, and ATP5CS1, which lack the CRT/DRE motif, was not affected. The freezing-sensitive phenotype that defines sfr 6 also was found to be tightly linked to the gene expression phenotype. To determine whether the failure of cold induction of CRT/DRE-containing genes in sfr 6 was due to altered low-temperature calcium signaling, cold-induced cytosolic-free calcium ([Ca2+]cyt) elevations were investigated in the sfr 6 mutant, but these were found to be indistinguishable from those of the wild type. We discuss the possibilities that CRT/DRE binding proteins (such as CBF1) require activation to play a role in transcription and that the SFR6 protein is a vital component of their activation.

Item Type: Article
Subjects: Q Science > QK Botany
Divisions: Faculties > Sciences > Medway School of Pharmacy
Depositing User: Emma Veale
Date Deposited: 04 Dec 2015 13:22 UTC
Last Modified: 29 May 2019 16:36 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/52689 (The current URI for this page, for reference purposes)
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