Fig. 2From: Structural variability and niche differentiation in the rhizosphere and endosphere bacterial microbiome of field-grown poplar treesAlpha diversity estimates of the bacterial communities. a OTU richness estimates (number of observed OTUs). b Pielou’s evenness estimates. c Inverse Simpson diversity indices. Box plots display the first (25%) and third (75%) quartiles, the median and the maximum and minimum observed values within each data set. Alpha diversity estimates represent 15 biological replicates for the rhizosphere soil and root samples and 11 replicates for the stem and leaf samples and were calculated in mothur with 10,000 iterations. Data were analyzed by means of one-way ANOVAs and Tukey-Kramer post hoc comparisons. The overall plant compartment effects (F(DFn, DFd) and P value) are displayed at the top of each graph. Significant differences (P < 0.05) across plant compartments are indicated with lowercase letters Back to article page