A method to obtain monosporic cultures of arbuscular mycorrhizal fungi

We describe here a simple technique for obtaining monosporic cultures of PI M fungi. Gigaspora rosea, Gi. sp., Glomus mosseae and G, sp. were used. One surface-sterilized spore was transferred to a 5-cm diameter Petri dish wit h 10 mi of 10 mM MES buffer, plus 0.04 g of Gel-Gro. The contents of a verm iculite-perlite (1/1, v/v) dish with 2-week-old clover seedlings were trans ferred onto the Gel-Gro medium with the germinated spore. All plants inocul ated with single germinated spores developed mycorrhizas. With this system, non-destructive observation of development of hyphae, formation of fan-lik e structures, hyphal contact and penetration of AM fungi into the plant roo t was possible. (C) 2001 Elsevier Science Ltd. All rights reserved.