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Cold stress is one of the major abiotic stresses that limit crop production. The  ICE-CBF-COR  pathway is associated with cold stress response in a wide variety of crop species. However, the  ICE - CBF - COR  genes has not been well characterized in wheat ( Triticum aestivum ). This study identified, characterized and examined the expression profiles of the  ICE, CBF  and  COR  genes for cold defense in wheat. Five  ICE  (inducer of  CBF  expression) genes, 37  CBF  (C-repeat binding factor) genes and 11  COR  (cold-responsive or cold-regulated) genes were discovered in the wheat genome database. Phylogenetic trees based on all 53 genes revealed that  CBF  genes were more diverse than  ICE  and  COR  genes. Twenty-two of the 53 genes appeared to include 11 duplicated pairs. Twenty rice ( Oryza sativa ) genes and 21 sorghum ( Sorghum bicolor ) and maize ( Zea mays ) genes showed collinearity with the wheat  ICE ,  CBF  and  COR  genes. Transcriptome data and qRT-PCR analyses revealed tissue-specific expression patterns of the  ICE ,  CBF  and  COR  genes, and identified similarities in the expression pattern of genes from the same family when subjected to drought, heat, drought plus heat, and cold stress. These results provide information for better understanding the biological roles of  ICE ,  CBF ,  COR  genes in wheat.

Characterization and expression profiling of the ICE-CBF-COR genes in wheat