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Biomass of 15-day-old Arabidopsis thaliana plants after treatment with the ferment broth extracts of selected endophytes diluted to five concentration levels based on their IAA content. The IAA standard was used for the control plants. Significance is assessed based on p-values: * p ≤ 0.05; ** p ≤ 0.01; *** p ≤ 0.001 and **** p ≤ 0.0001.
