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Background  Diacylglycerol kinases (DGKs) are signaling enzymes that play pivotal roles in response to abiotic and biotic stresses by phosphorylating diacylglycerol (DAG) to form phosphatidic acid (PA). However, no comprehensive analysis of the  DGK  gene family had previously been reported in  B. napus  and its diploid progenitors ( B. rapa  and  B. oleracea ).    Results  In present study, we identified 21, 10, and 11  DGK  genes from  B. napus ,  B. rapa , and  B. oleracea , respectively, which all contained conserved catalytic domain and were further divided into three clusters. Molecular evolutionary analysis showed that speciation and whole-genome triplication (WGT) was critical for the divergence of duplicated  DGK  genes. RNA-seq transcriptome data revealed that, with the exception of  BnaDGK4  and  BnaDGK6 ,  BnaDGK  genes have divergent expression patterns in most tissues. Furthermore, some  DGK  genes were upregulated or downregulated in response to hormone treatment and metal ion (arsenic and cadmium) stress. Quantitative real-time PCR analysis revealed that different  BnaDGK  genes contribute to seed oil content.    Conclusions  Together, our results indicate that  DGK  genes have diverse roles in plant growth and development, hormone response, and metal ion stress, and in determining seed oil content, and lay a foundation for further elucidating the roles of  DGKs  in  Brassica  species.

bmc plant biology

Genome-wide identification and comparative analysis of diacylglycerol kinase (DGK) gene family and their expression profiling in Brassica napus under abiotic stress