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. 2019 Apr 4;8(4):91. doi: 10.3390/plants8040091

Figure 3.

Figure 3

Auxin production by some representative purified bacterial strains in the presence and absence of L-tryptophan. Strains were grown in Luria–Bertani broth (L-broth) at 37 °C for 72 h. Bar represents the mean ± S.E. of three replicates. Different letters on bars indicate significant differences between respective treatments using Duncan’s multiple range test (p ≤ 0.05).