Plant growth promotion and fungicidal activity in a siderophore-producing strain of Proteus sp.
A proteus strain inhibited mycelial growth of Fusarium oxysporum in vitro. Seed bacterization showed significant plant growth promotion and Fusarium-wilt suppression activity of Phaseolus 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.
Barthakur
M
M
Soil Microbiology Division, Regional Research Laboratory, Council of Scientific and Industrial Research, Jorhat 785 006, Assam, India.
D000935:Antifungal Agents / Q000302:isolation & purification / Q000378:metabolism* / Q000494:pharmacology; D002851:Chromatography, High Pressure Liquid; D005670:Fusarium / Q000187:drug effects / Q000472:pathogenicity; D007651:Keto Acids / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology; D010935:Plant Diseases / Q000382:microbiology; D010937:Plant Growth Regulators / Q000096:biosynthesis* / Q000302:isolation & purification / Q000494:pharmacology; D011511:Proteus / Q000502:physiology*; D017262:Siderophores / Q000096:biosynthesis* / Q000302:isolation & purification / Q000494:pharmacology
D000935:Antifungal Agents; D007651:Keto Acids; D010937:Plant Growth Regulators; D017262:Siderophores; C013082:alpha-ketoisocaproic acid