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Sclerotinia sclerotiorum  (Lib.) de Bary is a devastating fungal pathogen with worldwide distribution.  S. sclerotiorum  is a necrotrophic fungus that secretes many cell wall-degrading enzymes (CWDEs) that destroy plant’s cell-wall components. Functional analyses of the genes that encode CWDEs will help explain the mechanisms of growth and pathogenicity of  S. sclerotiorum . Here, we isolated and characterized a gene  SsXyl1  that encoded an endo-β-1, 4-xylanase in  S. sclerotiorum . The  SsXyl1  expression showed a slight increase during the development and germination stages of sclerotia and a dramatic increase during infection. The expression of  SsXyl1  was induced by xylan. The  SsXyl1  deletion strains produce aberrant sclerotia that could not germinate to form apothecia. The  SsXyl1  deletion strains also lost virulence to the hosts. This study demonstrates the important roles of endo-β-1, 4-xylanase in the growth and virulence of  S. sclerotiorum.

Disruption of the Gene Encoding Endo-β-1, 4-Xylanase Affects the Growth and Virulence of Sclerotinia sclerotiorum