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Myeloblastosis (MYB)-related transcription factors comprise a large subfamily of the MYB family. They play significant roles in plant development and in stress responses. However, MYB-related proteins have not been comprehensively investigated in rapeseed ( Brassica napus  L.). In the present study, a genome-wide analysis of MYB-related transcription factors was performed in rapeseed. We identified 251  Brassica napus MYB  (BnMYB)-related members, which were divided phylogenetically into five clades. Evolutionary analysis suggested that whole genome duplication and segmental duplication events have played a significant role in the expansion of  BnMYB-related  gene family. Selective pressure of  BnMYB-related  genes was estimated using the  Ka/Ks  ratio, which indicated that  BnMYB-related  genes underwent strong purifying selection during evolution.  In silico  analysis showed that various development-associated, phytohormone-responsive, and stress-related  cis -acting regulatory elements were enriched in the promoter regions of  BnMYB-related  genes. Furthermore,  MYB-related  genes with tissue or organ-specific, stress-responsive expression patterns were identified in  B. napus  based on temporospatial and abiotic stress expression profiles. Among the stress-responsive  MYB-related  genes,  BnMRD107  was strongly induced by drought stress, and was therefore selected for functional study. Rapeseed seedlings overexpressing  BnMRD107  showed improved resistance to osmotic stress. Our findings not only lay a foundation for further functional characterization of  BnMYB-related  genes, but also provide valuable clues to determine candidate genes for future genetic improvement of  B. napus .

Genome-Wide Analysis of Myeloblastosis-Related Genes in Brassica napus L. and Positive Modulation of Osmotic Tolerance by BnMRD107