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Comparison of the number of bacteria (in colony-forming units (cfu) per gram of fresh root material) growing on 1/10 diluted 869 medium with both agar and gellan gum as gelling agent and with autoclaved or filter sterilized plant extract (average of three technical repeats). The number of species that were visually distinguishable are given on the secondary y-axis. Bars with different letters are significantly different from each other (P < 0.05).
