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The pheromone-response MAPK pathway is essential for trap morphogenesis in the nematode-trapping fungus A. oligospora. Different roles of Fus3/Kss1 MAPK signaling cascades in A. oligospora and other Ascomycetes. In A. oligospora, nematode-derived cues activate the Fus3 MAPK signaling cascade to turn on the trap morphogenesis via the conserved downstream transcription factor Ste12. The Fus3 MAPK signaling also regulates vegetative growth and conidiation in A. oligospora.
