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LysM effectors play a relevant role during the plant colonization by successful phytopathogenic fungi, since they enable them to avoid either the triggering of plant defense mechanisms or their attack effects. Tal6, a LysM protein from , is capable of binding to complex chitin. However, until now its biological function is not completely known, particularly its participation in plant- interactions. We obtained null mutant and overexpressing strains and determined the role played by this protein during -plant interaction and mycoparasitism. LysM effector Tal6 from protects the hyphae from chitinases by binding to chitin of the fungal cell wall, increases the fungus mycoparasitic capacity, and modulates the activation of the plant defense system. These results show that beneficial fungi also employ LysM effectors to improve their association with plants.