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Background  Plant basic leucine zipper (bZIP) transcription factors are one of the largest and most diverse gene families and play key roles in regulating diverse stress processes.  Brachypodium distachyon  is emerging as a widely recognized model plant for the temperate grass family and the herbaceous energy crops, however there is no comprehensive analysis of bZIPs in  B. distachyon , especially those involved in stress tolerances.    Results  In this study, 96 bZIP genes ( BdbZIP s) were identified distributing unevenly on each chromosome of  B. distachyon , and most of them were scattered in the low CpG content regions. Gene duplications were widespread throughout  B. distachyon  genome. Evolutionary comparisons suggested  B. distachyon  and rice’s bZIPs had the similar evolutionary patterns. The exon splicing in BdbZIP motifs were more complex and diverse than those in other plant species. We further revealed the potential close relationships between  BdbZIP  gene expressions and items including gene structure, exon splicing pattern and dimerization features. In addition, multiple stresses expression profile demonstrated that  BdbZIP s exhibited significant expression patterns responding to 14 stresses, and those responding to heavy metal treatments showed opposite expression pattern comparing to the treatments of environmental factors and phytohormones. We also screened certain up- and down-regulated  BdbZIP  genes with fold changes ≥2, which were more sensitive to abiotic stress conditions.    Conclusions   BdbZIP  genes behaved diverse functional characters and showed discrepant and some regular expression patterns in response to abiotic stresses. Comprehensive analysis indicated these  BdbZIP s’ expressions were associated not only with gene structure, exon splicing pattern and dimerization feature, but also with abiotic stress treatments. It is possible that our findings are crucial for revealing the potentialities of utilizing these candidate  BdbZIPs  to improve productivity of grass plants and cereal crops.    Electronic supplementary material  The online version of this article (doi:10.1186/s12864-015-1457-9) contains supplementary material, which is available to authorized users.

bmc genomics

Genome-wide evolutionary characterization and analysis of bZIP transcription factors and their expression profiles in response to multiple abiotic stresses in Brachypodium distachyon