Characterization of Bioactivity and Antimicrobial Metabolite Production in Bacteria Antagonistic to Plant and Foodborne Molds

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  • Biocontrol agents show promise in mitigating the drawbacks of synthetic chemicals. This study investigates potential biocontrol bacteria isolated from disease suppressive composts to reduce Fusarium dry rot on potato tubers, and to gain insight into the mode of action of Arthrobacter spp. The objectives were to (i) evaluate the antagonistic activity against Fusarium sambucinum in vitro and suppression of potato dry rot, (ii) assess the antimicrobial activity of Arthrobacter spp. in vitro and in vivo, and (iii) identify possible modes of action of these antagonistic bacteria. Results indicated that bacterial isolates from Bacillus, Pseudomonas, and Arthrobacter genera suppressed Fusarium dry rot. Additionally, Arthrobacter humicola M9-1A, M9-2, and M9-8, A. psychrophenolicus M9-17 and their cell-free filtrates possess antimicrobial properties suppressing various plant pathogens. Two antimicrobial compounds were isolated and characterized from A. psychrophenolicus M9-17. Overall, this study reported that antibiosis may be a major mode of action of these bacteria.

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  • Copyright © 2021 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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  • 2021


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