Fig. 2.

Taxonomic composition and Venn diagrams of the 16S rRNA and nifH gene communities inhabiting the rhizosphere of medicinal plants (German chamomile [Matricaria chamomilla L.] and African nightshade [Solanum distichum Schumach. and Thonn.]). Both plants were cultivated in direct proximity to each other under field conditions (loamy sand soil) and were investigated in four independent replicate samples by amplicon sequencing. Singletons, operational taxonomic units defined by only a single observation, were removed and not considered in either dataset.