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Heat shock protein 90 (HSP90) is highly conservative molecular chaperon produced by plants in response to adverse environmental stresses including fungal infection. In China, canker disease, caused by Valsa mali, is the main threat for Malus sieversii, an ancestor of the cultivated apple. In this study, a total of eight HSP90 genes were identified from the M. sieversii genome and randomly distributed on eight chromosomes. According to gene structure and phylogenetic analysis, the MsHSP90s can be divided into five categories. The transcriptome analysis of M. sieversii under V. mali infection showed that the plant pathogen interaction pathway was identified as significantly enriched. RNA-seq data and qRT-PCR analysis demonstrated that the MsHSP90-6a gene was significantly repressed by V. mali infection. We further predicted cis-regulatory elements on the promotor region of MsHSP90 genes and identified canonical SHE motifs. Our results improve our understanding of the HSP90 gene family and provide a foundation for further studies of disease prevention in M. sieversii.

Genome-Wide Characterization of HSP90 Gene Family in Malus sieversii and Their Potential Roles in Response to Valsa mali Infection