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[Abstract] Verticillium dahliae is a soil-borne phytopathogenic fungus that infects host roots and proliferates in vascular tissues. The great loss of economically important crop caused by V. dahliae has raised worldwide concern, however, little is known about the mechanism of its pathogenicity (Klosterman et al., 2011; Yadeta and Thomma, 2013). Our recent work has shown that V. dahliae develops hyphopodium as an infection structure to breach plant root cell wall (Zhao et al., 2016). Here, we provide a detailed protocol to analyze the penetration ability and the pathogenicity of V. dahliae as well as recover fungal hyphae from infected cotton stems developed from our previous studies (Zhang et al., 2016a and 2016b; Zhao et al., 2016). Cellophane membrane has been used in inducing appressorium development of foliar pathogens but not root pathogens (Bourett and Howard, 1990). We adopted the method of using the cellophane membrane to induce and assess the development of hyphopodium. Hopefully, it will greatly promote the research of molecular events involved in recognition of the host that regulate infectious development. This protocol is also helpful to identify the key component controlling the pathogenicity of V. dahliae and widen our understanding of the mechanism of plant-microbe interaction.

Penetration Assays, Fungal Recovery and Pathogenicity Assays for Verticillium dahliae