Enhanced Expression of Thaumatin-like Protein Gene (LeTLP1) Endows Resistance to Trichoderma atroviride in Lentinula edodes.

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Citation abstract

Lentinula edodes (shiitake mushrooms) is heavily affected by the infection of Trichoderma atroviride, causing yield loss and decreases quality in shiitake mushrooms. The selection and breeding of fungal-resistant L. edodes species are an important approach to protecting L. edodes from T. atroviride infection. Herein, a highly resistant L. edodes strain (Y3334) and a susceptible strain (Y55) were obtained by using a resistance evaluation test. Transcriptome analyses and qRT-PCR detection showed that the expression level of LeTLP1 ( LE01Gene05009 ) was strongly induced in response to T. atroviride infection in the resistant Y3334. Then, LeTLP1- silenced and LeTLP1 -overexpression transformants were obtained. Overexpression of LeTLP1 resulted in resistance to T. atroviride. Compared with the parent strain Y3334,  LeTLP1- silenced transformants had reduced resistance relative to T. atroviride. Additionally, the Le TLP1 protein (Y3334) exhibited significant antifungal activity against T. atroviride. These findings suggest that overexpression of LeTLP1 is a major mechanism for the resistance of L. edodes to T. atroviride. The molecular basis provides a theoretical basis for the breeding of resistant L. edodes strains and can eventually contribute to the mushroom cultivation industry and human health.