Sensitivity of Several Species of the Nematophagous Fungus Dactylella To a Morphogenic Substance Derived From Free-Living Nematodes

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A morphogenic substance derived from the nematode Panagrellus redivivus elicited differing degrees of sensitivity in four species of the hyphomycete Dactylella, yet all the species tested responded to the presence of a single live nematode. Each predaceous fungus apparently has a different reactive threshold to the morphogenic complex. It is postulated that the morphogenic substance designated Endogenous Nemin (EN) is similar to the organizers of vertebrate embryos.

Affiliations: 1: Crops Division, Agricultural Research Service, U.S. Department of Agriculture, Orlando, Florida, U.S.A.; 2: Department of Chemistry and Biology, The Polytechnic, London, England

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