Elevated CO(2) decouples bacterial antagonism from wheat take-all suppression while reshaping rhizosphere microbiome responses.

Elevated CO2 in growth chambers enhances wheat growth but decouples bacterial consortium antagonism from take-all suppression, with Ggt + consortia showing the highest root lipid peroxidation (TBARS).

• Why it matters: Rising atmospheric CO2 may reshape plant–pathogen and microbiome interactions, risking loss of effectiveness for microbial bioinoculants developed under present-day conditions.
• What they did: They tested Bacillus sp., Serratia sp., and Acinetobacter sp. consortia against Gaeumannomyces graminis var. tritici in vitro under contrasting CO2, then inoculated wheat in climate-controlled chambers to measure disease severity and rhizosphere shifts.
• The result: In vitro, bacterial treatments inhibited Ggt growth, with eCO2 enhancing day-6 antagonism for Acinetobacter sp. and the consortium; in planta, consortia inoculation did not significantly suppress take-all under eCO2 and increased alpha diversity and stress-adapted taxa.

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