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Biological control of Rhizoctonia solani damping-off of bean by Bacillus spp. [electronic resource].

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Refae, R. I

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Language: English Summary language: Arabic Description: p.2321-2344Other title:

المقاومة الحيوية لفطر+رايزوكتونيا سولانى المسبب لمرض سقوط البادرات فى الفاصوليا بواسطة أنواع من بكتريا الباسيلس [Added title page title]

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Mansoura University journal of agricultural sciences, 2006 v. 31 (4) [electronic resource].

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In: Mansoura Unviersity Journal of Agricultural Sciences 2006.v.31(4)Summary: Six bacilli strains, five B. subtilis and one B. cereus, isolated from the rhizosphere of healthy bean, pea, strawberry and peppermint plants grown in heavily infested fields with root rot pathogens were experimented for biological control activity against Rhizoctonia so/ani. In vitro studies showed that all the members significantly inhibited (35-48 %, depending upon strain) the mycelial growth of R. solani A clear lytic area appeared in the R. solani hyphae that subjected to Bacillus metabolites. The produelion of antifungal metabolites by Bacillus candidates reached its maximum (58-71 %j at the end of the stationary phase (18-39 hours) of the tested bacilli. The extraordinary multiplicatlng bioagents (3.1-4.3 x 10⁷ cfu ml⁻¹ ) were more efficient in restricting mycelial growth of the pathogen. Mannitol broth deemed the optimum for antifungal production. Inhibition of the fungal mycelial growth positively correlated with increased concentrations of the Bacillus cell-free culture filtrate.

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Six bacilli strains, five B. subtilis and one B. cereus, isolated from the rhizosphere of healthy bean, pea, strawberry and peppermint plants grown in heavily infested fields with root rot pathogens were experimented for biological control activity against Rhizoctonia so/ani. In vitro studies showed that all the members significantly inhibited (35-48 %, depending upon strain) the mycelial growth of R. solani A clear lytic area appeared in the R. solani hyphae that subjected to Bacillus metabolites. The produelion of antifungal metabolites by Bacillus candidates reached its maximum (58-71 %j at the end of the stationary phase (18-39 hours) of the tested bacilli. The extraordinary multiplicatlng bioagents (3.1-4.3 x 10⁷ cfu ml⁻¹ ) were more efficient in restricting mycelial growth of the pathogen. Mannitol broth deemed the optimum for antifungal production. Inhibition of the fungal mycelial growth positively correlated with increased concentrations of the Bacillus cell-free culture filtrate.

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