Abstract
AProteus strain inhibited mycelial growth ofFusarium oxysporum in vitro. Seed bacterization showed significant plant growth promotion andFusarium-wilt suppression activity ofPhaseolus mungo in a gnotobiotic system. The culture filtrate of this strain exhibited three prominent bands in UV-VIS spectra between 300 and 400 nm. The growth promotion assay of the extracted compound against different indicator organisms indicated the production of a compound related to a 2-oxoacid-type siderophore. The HPLC of the purified ethyl acetate extract of the strains and standard 4-methyl-2-oxopentanoate (2-oxoisocaproate) revealed a single peak, similarly as the coinjection of the extract and the standard. The production of siderophore, probably 2-oxoisocaproate, was demonstrated.
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Barthakur, M. Plant growth promotion and fungicidal activity in a siderophore-producing strain ofProteus sp.. Folia Microbiol 45, 539–543 (2000). https://doi.org/10.1007/BF02818723
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DOI: https://doi.org/10.1007/BF02818723