Phenazines producing pseudomonas isolates decrease Alternaria tenuissima growth, pathogenicity and disease incidence on cardoon
2012
Phenazines, secondary metabolites of fluorescent Pseudomonas, represent a
group of heterocyclic nitrogen-containing compounds showing a broad spectrum
of antibiotic properties. Phenazines producing fluorescent Pseudomonas
species are studied extensively for their application in plant disease
management. In this study, we examined the antifungal activity of different
indigenous Pseudomonas isolates (Q16, B25 and PS2) against the
phytopathogenic fungus Alternaria tenuissima, which had infected cardoon
(Cynara cardunculus L., Asteraceae). An in vitro experiment demonstrated the
antifungal activity of selected indigenous isolates. In addition, an in vivo
experiment under gnotobiotic conditions showed suppression of C. cardunculus
disease caused by A. tenuissima. The quantification of phenazines revealed
significant amounts of phenazine-1-carboxylic acid (PCA) and
2-hydroxy-phenazine-1-carboxylic acid (2-OH-PCA). PCR analysis confirmed the
presence of PCA genes in all examined indigenous Pseudomonas isolates. Based
on our results, we assume that these Pseudomonas isolates have potential in
controlling plant diseases caused by A. tenuissima. [Projekat Ministarstva
nauke Republike Srbije, br. III46007 and br. TR31018]
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