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MADS-box transcription factors are highly conserved in eukaryotic species and involved in a variety of biological processes. Little is known, however, regarding the function of MADS-box genes in  Botrytis cinerea , a fungal pathogen with a wide host range. Here, the functional role of the  B. cinerea  MADS-box gene,  Bcmads1,  was characterized in relation to the development, pathogenicity and production of sclerotia. The latter are formed upon incubation in darkness and serve as survival structures during winter and as the female parent in sexual reproduction.  Bcmads1  is indispensable for sclerotia production. RT-qPCR analysis suggested that  Bcmads1  modulated sclerotia formation by regulating the expression of light-responsive genes.  Bcmads1  is required for the full virulence potential of  B. cinerea  on apple fruit. A comparative proteomic analysis identified 63 proteins, representing 55 individual genes that are potential targets of  Bcmads1 . Among them, Bcsec14 and Bcsec31 are associated with vesicle transport. Deletion of  Bcsec14  and  Bcsec31  resulted in a reduction in the virulence and protein secretion of  B. cinerea . These results suggest that  Bcmads1  may influence sclerotia formation by modulating light responsive gene expression and regulate pathogenicity by its effect on the protein secretion process.

The MADS-Box transcription factor Bcmads1 is required for growth, sclerotia production and pathogenicity of Botrytis cinerea