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Background  Heat shock proteins have important functions in regulating plant growth and response to abiotic stress.  HSP70  family genes have been described in several plant species, but a comprehensive analysis of the  HSP70  family genes in cabbage has not been reported to date, especially their roles in floral development.    Results  In this study, we identified 52  BoHSP70  genes in cabbage. The gene structures, motifs, and chromosome locations of the  BoHSP70  genes were analyzed. The genes were divided into seven classes using a phylogenetic analysis. An expression analysis showed that the  BoHSP70  genes were highly expressed in actively growing tissues, including buds and calluses. In addition, six  BoHSP70  genes were highly expressed in the binuclear-pollen-stage buds of a male fertile line compared with its near isogenic sterile line. These results were further verified using qRT-PCR. Subcellular localization analysis of the bud-specific gene  BoHSP70–5  showed that it was localized in the cytoplasm.    Conclusions  Our results help to elucidate the involvement of the  BoHSP70  family genes in cabbage floral development and establish the groundwork for future research on the functions of these genes.    Electronic supplementary material  The online version of this article (10.1186/s12864-019-5757-3) contains supplementary material, which is available to authorized users.

Genome-wide analysis of HSP70 family genes in cabbage (Brassica oleracea var. capitata) reveals their involvement in floral development