FIGURE 1.

Identity, abundance and activity levels of cultivable mineral phosphate-solubilizing bacteria in the wheat rhizospheres. Taxa have been summarized on genus level and the most dominant ones, with a relative abundance ≥2% within the collection, are shown in the pie charts at (A) stem elongation stage in May 2015 and (B) grain filling stage in July 2015. The predominantly isolated taxa of the genus Phyllobacterium, Pseudomonas and Streptomyces were clustered (identity level of 99.5%) and (C) phylogenetic trees were created for dominant clusters (number of isolates >3) with reference sequences from NCBI. Information on abundance of the dominant clusters within treatment levels of growth stage (stem elongation in May, grain filling in July), climate (A-ambient, F-future) and land use (CF-conventional farming, OF-organic farming) are given as circles, whereas circle size is related to the number of isolates. Moreover, the average phosphate solubilizing potentials for each bacterial 16S rRNA gene cluster were calculated for PSI 1 and PSI 2 and differences in expression levels are indicated using a heatmap.