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CGF-1 strain was grown on different sources and the produced IAA was quantified by using HPLC. Suc = sucrose; Yst = yeast; Glu = glucose; Malt = maltose; Trpa = 1000 μg tryptophan; Trpb = 500 μg tryptophan; Trpc = 100 μg tryptophan. The experiment was carried out in triplicate. The boxplots having different letters are significantly different from each other at P < 0.05.
