Abstract
The effect of microbial preparations on plant growth and resistance to diseases depends on plant genotype and growth conditions limiting their use in agriculture. Various biocontrol effects, reported for the endophyte Methylobacterium sp. IMBG290, are possibly modulated through the endophyte community of the potato (Solanum tuberosum L.) host. In the current study, we analyzed growth promoting and biocontrol capacities of IMBG290 alone and when combined with commercial bacterial preparation under field conditions. The effect of microbial inoculants on potato growth and disease prevalence was monitored during 2-year field experiment and matched with metagenomic analysis results of potato endophytic community. The effect of microbial inoculants on plant growth and disease prevalence varied from positive to negative depending on potato cultivar, bacterial treatment and environmental conditions. A cultivar-dependent synergistic effect of combined inoculation was observed. The positive effect of bacterial treatments was associated with a shift in the structure of communities of bacterial and fungal endophytes. Cultivar-environment interaction associated with a shift in the endophytic microbial community play a role in the potato response to bacterial preparations. This should be considered when designing complex microbial inoculants.
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