Evidence for Production of Inhibitor by the Vesicular-Arbuscular-Mycorrhizal Fungus Gigaspora margarita

Abstract

Incubation of spores of G. margarita on agar medium containing activated charcoal resulted in an increased rate of hyphal growth. Circular patterns simulated by hyphal growth from groups of centrally plated spores following germination permitted assessment of colony diam. Pretreatment of spores or water with activated charcoal did not enhance fungal growth. An inhibitor of fungal growth is apparently produced or released during and/or after germination.