Fig. 3From: Identification and characterization of the rhizosphere phosphate-solubilizing bacterium Pseudomonas frederiksbergensis JW-SD2, and its plant growth-promoting effects on poplar seedlingsPhosphate-solubilizing activity, growth of Pseudomonas frederiksbergensis JW-SD2 and acidification of medium during the phosphate solubilization. a The phosphate-solubilizing activity and growth of JW-SD2. b The pH value and titratable acidity in the culture medium. Lowercase letters indicate significant differences at P < 0.05. Error bars Standard deviation (SD)Back to article page