Establishment of monoxenic culture between the arbuscular mycorrhizal fungus Glomus sinuosum and Ri T-DNA-transformed carrot roots

We report for the first time the establishment of an arbuscular mycorrhizal association between Glomus sinuosum (= Sclerocystis sinuosa) and transformed Ri T-DNA carrot (Daucus carota L.) roots in monoxenic culture. The G. sinuosum sporocarps survived not as single spores, but as sporocarps in the environment. The mode of germination of G. sinuosum was by extension of hyphae around the sporocarp. Numerous vegetative spores, arbuscules and vesicles were produced after the roots were infected by the hyphae. New mature sporocarps started to form after four months in the culture system. Forty-seven sporocarps were produced on average in each culture dish after six months, and these newly produced sporocarps were capable of germination in the growth medium.