DOI: 10.20289/zfdergi.1836188 ISSN: 1018-8851

Dual protective roles of plant beneficial bacteria in drought resilience and suppression of tomato bacterial canker caused by Clavibacter michiganensis subsp. michiganensis

Barış Can Arda, Utku Şanver, Hatice Özaktan
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Objective: This study aimed to evaluate the ability of two beneficial bacterial isolates to mitigate the effects of Clavibacter michiganensis subsp. michiganensis (Cmm) and drought stress on tomato plants. Materials and Methods: 30 isolates were screened for in vitro antagonism against Cmm; isolates TR21/1 and CA18 were selected for in vivo testing under Cmm infection, drought, and combined stress conditions. Results: Isolate TR21/1 showed the highest in vitro inhibition zone (27.26 mm) and reduced Cmm-related disease by 38-83% in vivo. Under drought stress, isolate CA18 increased plant biomass by 30-38%. Combined inoculation with TR21/1 and CA18 elicited the strongest response, increasing biomass by 124-174% and reducing disease severity by 56-69%. Conclusion: Both isolates were effective, but their combined application produced the greatest overall improvement.

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