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Changes in bacterial 16S rRNA gene copy numbers per g soil after 4 days of incubation. Bacteria were incubated in soil mixed with artificial root exudates as monoculture (Mono), bacterial mixture of five strains (5-Mix), or mixture of four strains excluding Paenibacillus sp. AD087 (4-Mix). Data represent values corrected for the starting time point t0. Different letters indicate significant difference (P < 0.05) between values resulted from One-way ANOVA and Tukey's HSD test.
