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The IAA yield (A) and the growth curve (B) of P. polymyxa SC2-M1. Strain SC2-M1 was activated and inoculated by 5% in Landy medium with or without 3 mM L-tryptophan for 72 h at 25 °C. The concentration of IAA was measured by colorimetric method. The test group (named as M1-T) was cultured with 3 mM L-tryptophan compared with the control group (named as M1) without L-tryptophan. Compared with the control, data that significantly increased (p < 0.05) were marked with *
