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• W2123344462 endingPage "455" @default.
• W2123344462 startingPage "446" @default.
• W2123344462 abstract "ABSTRACT Trichoderma virens is a mycoparasitic fungus used in biocontrol of soilborne plant pathogens. It inhibits or kills plant-pathogenic fungi through production of antifungal antibiotics and parasitism of hyphae and sclerotia. Conidiation, or the production of asexual spores, an inducible process triggered by light or nutrient stress, is an important trait in survival and also development of formulation products. In many fungi, signaling pathways, including mitogen-activated protein kinase (MAPK) cascades, have been implicated in parasitism of host plants as well as in the production of asexual spores. Here, we have studied the role of a MAPK gene, that for TmkA, in conidiation and antagonistic properties of a biocontrol strain of T. virens . Through single- and double-crossover recombination, we obtained three tmkA loss-of-function mutants. The TmkA transcript was not detectable in these mutants. The mutants conidiated in the dark, although photoinduction was normal and the light sensitivities of the wild type and the mutant were the same. The mutants had, overall, normal colony morphology, but their radial growth rate was reduced by about 16%, with no decrease in biomass production. Against Rhizoctonia solani hyphae, the knockout mutants exhibited mycoparasitic coiling and lysis of host hyphae similar to that of the wild type. The mutants, however, were less effective in colonizing the sclerotia of R. solani . On Sclerotium rolfsii , the MAPK loss-of-function mutants had reduced antagonistic properties in confrontation assays and failed to parasitize the sclerotia. TmkA-dependent and -independent pathways are thus involved in antagonism against different hosts. Finally, in contrast to the case for other filamentous fungi studied so far, signaling through a MAPK represses, rather than induces, asexual sporulation." @default.
• W2123344462 created "2016-06-24" @default.
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• W2123344462 date "2003-06-01" @default.
• W2123344462 modified "2023-09-23" @default.
• W2123344462 title "TmkA, a Mitogen-Activated Protein Kinase of <i>Trichoderma virens</i> , Is Involved in Biocontrol Properties and Repression of Conidiation in the Dark" @default.
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• W2123344462 doi "https://doi.org/10.1128/ec.2.3.446-455.2003" @default.
• W2123344462 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/161448" @default.
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