Department of Applied Microbiology, Sri Padmavathi Mahila Viswavidyalayam, Tirupati 517 502, India
*Corresponding author; E-mail: vijayal_k@rediffmail.com Tel: 91(877)2248481(O); Fax: 91(877)2248417
Plant growth promoting rhizobacteria belonging to fluorescent pseudomonads were isolated from rhizosphere of rice, wheat, pigeon pea, groundnut and chilli crops. The isolates belonged to Pseudomonas fluorescens and produced extracellular siderophores when grown in casamino acid medium under iron deficiency. The siderophores were found to be of trihydroxamate type pyoverdines forming hexadentate ligands with Fe+3 ions. These siderophores were antagonistic to fungal pathogens like Fusarium oxysporum, Alternaria sp. and Colletotrichum capsicii.
Siderophores, Pseudomonas fluorescens, PGPR, phytopathogens, pyoverdines
