Fig. 3. Transfer rates of ¹⁵N applied into the labelling compartment to the roots together with the mycorrhizal hyphae attached to them (if applicable) in Experiment 1 according to presence or absence of mycorrhizal fungus in the experimental system (M + , mycorrhizal; NM, non-mycorrhizal) and identity of selected bacterial isolates added to the labelling compartment.

Shown are mean values (and standard deviations) of 5–8 replicates per treatment. Presented values illustrate the fraction of ¹⁵N-labelled mineral (A) or organic (B) nitrogen source applied into the labelling compartment and transferred to the non-mycorrhizal roots or mycorrhizal roots together with their attached mycorrhizal hyphae extracted from the large dish volume at the end of the experiment (%).