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Background Bread wheat ( Triticum aestivum ) is an important staple cereal grain worldwide. The ever-increasing environmental stress makes it very important to mine stress-resistant genes for wheat breeding programs. Therefore,  dehydrin  ( DHN ) genes can be considered primary candidates for such programs, since they respond to multiple stressors. Results In this study, we performed a genome-wide analysis of the  DHN  gene family in the genomes of wheat and its three relatives. We found 55  DHN  genes in  T. aestivum , 31 in  T. dicoccoides , 15 in  T. urartu , and 16 in  Aegilops tauschii . The phylogenetic, synteny, and sequence analyses showed we can divide the  DHN  genes into five groups. Genes in the same group shared similar conserved motifs and potential function. The tandem  TaDHN  genes responded strongly to drought, cold, and high salinity stresses, while the non-tandem genes respond poorly to all stress conditions. According to the interaction network analysis, the cooperation of multiple DHN proteins was vital for plants in combating abiotic stress. Conclusions Conserved, duplicated  DHN  genes may be important for wheat being adaptable to a different stress conditions, thus contributing to its worldwide distribution as a staple food. This study not only highlights the role of  DHN  genes help the  Triticeae  species against abiotic stresses, but also provides vital information for the future functional studies in these crops.

bmc genomics

Genome-wide survey of the dehydrin genes in bread wheat (Triticum aestivum L.) and its relatives: identification, evolution and expression profiling under various abiotic stresses