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Pseudomonas sp. isolate UV3, when added to conidial suspensions of Colletotrichum acutatum, stimulated germination and appressorium formation on glass slides and on host surfaces. A siderophore (SA), purified from low-iron culture of the bacteria, stimulated germination and appressorium formation to a significantly greater extent than the bacterial cells alone. The fully chelated siderophore (S,Fe) and free ferric iron were inhibitory in vitro to germination and appressorium formation but inhibited only the latter in vivo. The SA is compared with nutrients at similar concentrations, and the role of the phytoplane microflora and associated siderophores is discussed in relation to fungal infection.

The Role of a Bacterial Siderophore and of Iron in the Germination and Appressorium Formation by Conidia of Colletotrichum acutatum