Antagonistic mechanisms of fluorescent pseudomonads against Phytophthora capsici Leonian in black pepper (Piper nigrum Linn.)
Paul, Diby; Anandraj, M.; Kumar, A. and Sarma, Y.R. (2006) Antagonistic mechanisms of fluorescent pseudomonads against Phytophthora capsici Leonian in black pepper (Piper nigrum Linn.). Journal of Spices and Aromatic Crops.
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Fluorescent pseudomonads were selectively isolated from black pepper (Piper nigrum Linn.) roots and screened for volatile and non-volatile metabolite production and inhibition in growth of Phytophthora capsici, the causal organism of foot rot disease. Among the isolates tested, the inhibition of P. capsici varied from 36.3 % to 70.0 % by non-volatile metabolites and 2 % to 23% by volatile-metabolites. Isolate IISR-51, caused maximum inhibition of P. capsici by production of nonvolatile and volatile metabolites. The strains of fluorescent pseudomonads also produced hydrogen cyanide (HCN), which limited the growth of P.capsici. The study indicated the involvement of siderophore - mediated antagonism in fluorescent pseudomonads. Upon root bacterization of black pepper cuttings, the strains of fluorescent pseudomonads could systemically invade the plant.
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