alexa Efficacy of Bacillus subtilis V26 as a biological control agent against Rhizoctonia solani on potato.


Journal of Plant Pathology & Microbiology

Author(s): Ben Khedher S, KilaniFeki O, Dammak M, JabnounKhiareddine H, DaamiRemadi M,

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Abstract The aim of this study is to evaluate the efficacy of the strain Bacillus subtilis V26, a local isolate from the Tunisian soil, to control potato black scurf caused by Rhizoctonia solani. The in vitro antifungal activity of V26 significantly inhibited R. solani growth compared to the untreated control. Microscopic observations revealed that V26 caused considerable morphological deformations of the fungal hyphae such as vacuolation, protoplast leakage and mycelia crack. The most effective control was achieved when strain V26 was applied 24h prior to inoculation (protective activity) in potato slices. The antagonistic bacterium V26 induced significant suppression of root canker and black scurf tuber colonization compared to untreated controls with a decrease in incidence disease of 63\% and 81\%, respectively, and promoted plant growth under greenhouse conditions on potato plants. Therefore, B. subtilis V26 has a great potential to be commercialized as a biocontrol agent against R. solani on potato crops. Copyright © 2015 Académie des sciences. Published by Elsevier SAS. All rights reserved. This article was published in C R Biol and referenced in Journal of Plant Pathology & Microbiology

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