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Question is pretty straight forward. Are there generally any chemical cues?

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In model fungi, the G protein coupled receptor Gpr1 is known to sense sugars and upregulate a cAMP linked PKA pathway, while in pathogenic strains, it senses Methionine. This probably is the environmental cue that sets off fruiting. There is a recently published extensive review too: Heterotrimeric G protein signaling in filamentous fungi

Reference

  • Li, Liande, Sara J. Wright, Svetlana Krystofova, Gyungsoon Park, and Katherine A. Borkovich. “Heterotrimeric G Protein Signaling in Filamentous Fungi.” Annual Review of Microbiology 61, no. 1 (October 2007): 423–452.
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