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Fungal-fungal interaction often leads to the change in metabolite profile of both the interacting fungus which may have potential implication in industry or agriculture. In the present study, we performed two sets of fungal-fungal interaction— Trametes coccinea  (F3) with  Leiotrametes lactinea  (F9) and  T. coccinea  (F3) with  T. versicolor  (F1) to understand the changes in the metabolite profile during the interaction process and how this process impacts the hyphal/mycelial morphology of the participating fungi. The metabolites produced during interaction of  T. coccinea  (F3) with  L. lactinea  (F9) and  T. coccinea  (F3) with  T. versicolor  (F1) was analysed through liquid chromatography coupled to mass spectroscopy (LC-MS). Most of the metabolites secreted or produced during interaction are associated with defensive response. Further, visualization with scanning electron microscopy revealed that interaction between the tested fungi led to the changes in the hyphal morphology. The bipartite fungal interaction resulted in the production of a dark brown colour pigment—melanin as confirmed by the LC-MS, FTIR and NMR analysis. Moreover, the fungal–fungal interaction also led to increase in the production of laccase, a group of multicopper oxidases involved in detoxification of toxic compounds. Further, increased activity of superoxide dismutase, an enzyme that catalyzes the dismutation of the superoxide anion to hydrogen peroxide was also recorded during fungal–fungal interaction. Quantitative real-time PCR revealed upregulation of  lcc1  (encoding a laccase enzyme) and few other stress related genes of  T. versicolor  during its hyphal interaction with  T. coccinea , suggesting a direct correlation between laccase production and melanin production.   Supplementary Information  The online version contains supplementary material available at 10.1186/s43008-021-00082-y.

Melanin production and laccase mediated oxidative stress alleviation during fungal-fungal interaction among basidiomycete fungi