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Background   B-box  ( BBX ) genes play important roles in plant growth regulation and responses to abiotic stresses. The plant growth and yield production of allotetraploid rapeseed is usually hindered by diverse nutrient stresses. However, no systematic analysis of Brassicaceae  BBXs  and the roles of  BBXs  in the regulation of nutrient stress responses have not been identified and characterized previously.    Results  In this study, a total of 536  BBXs  were identified from nine brassicaceae species, including 32  AtBBXs , 66  BnaBBXs , 41  BoBBXs , 43  BrBBXs , 26  CrBBXs , 81  CsBBXs , 52  BnBBXs , 93  BjBBXs , and 102  BcBBXs . Syntenic analysis showed that great differences in the gene number of Brassicaceae  BBXs  might be caused by genome duplication. The  BBXs  were respectively divided into five subclasses according to their phylogenetic relationships and conserved domains, indicating their diversified functions. Promoter  cis -element analysis showed that  BBXs  probably participated in diverse stress responses. Protein-protein interactions between BnaBBXs indicated their functions in flower induction. The expression profiles of  BnaBBXs  were investigated in rapeseed plants under boron deficiency, boron toxicity, nitrate limitation, phosphate shortage, potassium starvation, ammonium excess, cadmium toxicity, and salt stress conditions using RNA-seq data. The results showed that different  BnaBBXs  showed differential transcriptional responses to nutrient stresses, and some of them were simultaneously responsive to diverse nutrient stresses.    Conclusions  Taken together, the findings investigated in this study provided rich resources for studying Brassicaceae  BBX  gene family and enriched potential clues in the genetic improvement of crop stress resistance.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12870-021-03043-0.

bmc plant biology

Genome-wide identification of Brassicaceae B-BOX genes and molecular characterization of their transcriptional responses to various nutrient stresses in allotetraploid rapeseed