Experimental study demonstrates suppression of sweet potato stem rot by endophytic Burkholderia, highlighting its potential as a sustainable biocontrol agent.
Sweet potato stem rot is caused by Fusarium oxysporum f. sp. batatas (Fob), a major soil-borne pathogen, and the recent emergence of benomyl-resistant isolates has raised concerns about its spread. In this study, endophytic bacteria were isolated from sweet potato seedlings grown in organic field soil in pots. Among six isolates, strain IUJS5 strongly and reproducibly suppressed Fob infection. Identified as Burkholderia sp., IUJS5 colonized seedlings and inhibited Fob mycelial growth in dual culture, forming clear inhibition zones. These results indicate that IUJS5 suppresses stem rot through antifungal activity, suggesting its potential as a biocontrol agent for sweet potato stem rot.
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SHIMADA et al. (2026) studied this question.
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