Figure 2.

(A) Quantitative production of IAA by 15 endophytic fungal strains in the absence/presence of different concentrations of tryptophan (1.0, 2.0, and 5.0 mg/L) after 7 days of incubation. (B) IAA production by the most potent five fungal strains in the presence of 5 mg/mL tryptophan and over 14 days. Ctrl, controls without fungal inoculation. Data are statistically different at p ≤ 0.05 by Tukey’s test, (n = 3); error bars are means ± SE. For each strain, bars with different letters (a, b, c, and d) denote that mean values are significantly different at a significance level of p ≤ 0.05. The standard error is less than the size of symbols if no error bars are seen.