Journal
MICROBIOLOGICAL RESEARCH
Volume 163, Issue 3, Pages 329-336Publisher
ELSEVIER GMBH
DOI: 10.1016/j.micres.2006.06.007
Keywords
Pseudomonas corrugata; pathogenic fungi; biomass reduction; diffusible compounds; volatile compounds; hydrolytic enzymes
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Pseudomonas corrugata, a soil bacterium originally isolated from a temperate site of Indian Himalayan Region (IHR) is examined for its antagonistic activities against two phytopathogenic fungi, Alternaria alternata and Fusarium oxysporum. Although the bacterium did not show inhibition zones due to production of diffusible antifungal metabolites, a reduction in growth between 58% and 49% in both test fungi, A. alternata and F oxysporum, was observed in seated Petri plates after 120h of incubation due to production of volatile antifungal. metabolites. Reduction in biomass of A. alternata (93.8%) and F oxysporum (76.9%) in Kings B broth was recorded after 48 h of incubation in dual culture. The antagonism was observed to be affected by growth medium, pH and temperature. The reduction in fungal biomass due to antagonism of bacteria was recorded maximum in the middle of the stationary phase after 21 h of inoculation. The production of siderophore, ammonia, lipase and chitinase in growth medium by P corrugata were considered contributing to the antagonistic activities of the bacterium. (c) 2007 Elsevier GmbH. All rights reserved.
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