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SUMMARY: 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 (S a ), 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 a Fe) and free ferric iron were inhibitory in vitro to germination and appressorium formation but inhibited only the latter in vivo. The S a is compared with nutrients at similar concentrations, and the role of the phytoplane microflora and associated siderophores is discussed in relation to fungal infection.
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