Journal
NATURE GENETICS
Volume 39, Issue 11, Pages 1410-1413Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ng.2007.3
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To acquire freezing tolerance, higher plants require a period of low temperature ( usually < 4 degrees C) termed cold acclimation. Upon transfer of plants to low temperature, increased expression of the (C) under bar RT/ DRE (b) under bar inding (f) under bar actor (CBF) family of transcriptional activators leads to the upregulation of genes containing a C-repeat/drought-responsive (CRT/DRE) promoter element and metabolic changes that enhance tolerance to subzero temperatures(1). Here, we show that a low red to farred ratio (R/FR) light signal increases CBF gene expression in Arabidopsis thaliana in a manner dependent on the circadian clock. This light quality-dependent increase in CBF expression is sufficient to confer freezing tolerance at temperatures higher than those required for cold acclimation. Furthermore, the use of light-quality signals to stimulate CBF expression has revealed ambient temperature-dependent coupling of CBF transcription factors to downstream COLD REGULATED ( COR) genes, providing evidence for a second temperature-regulated step in this pathway.
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