Interaction between Glomus mosseae and Erwinia carotovora and its effects on the growth of tomato plants

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Abstract
Summary: The effect of inoculation with Erwinia carotovora pv. carotovora on tomatoes with or without VA mycorrhizal infection by Glomus mosseae was studied in a greenhouse trial. E. carotovora decreased the growth of nonmycorrhizal tomato plants, but neither growth nor the percentage of total root length with VA infection were reduced in mycorrhizal plants. Protection of tomato against the pathogen and reduction in the number of colony‐forming units of E. carotovora in the rhizosphere of mycorrhizal plants were independent of concentration of P in the plant and the timing of inoculation with the two microorganisms. The possible mechanisms of the resistance induced in tomato plants by G. mosseae against E. carotovora are discussed.