Fig. 2
From: Tryptophan plays an important role in yeast’s tolerance to isobutanol
Growth assay related to the tryptophan biosynthesis pathway and isobutanol tolerance. a Growth assay (24 h) of the tryptophan biosynthesis pathway mutant strains Sc7and Sc12, and wild type (WT) in different isobutanol concentrations. Sc7 and Sc12 were more susceptible to isobutanol compared to WT. b The growth rate of defective mutant strains Sc7 and Sc12 can be recovered by adding exogenous tryptophan (24 h). c Wild type showed improvement in isobutanol tolerance after external tryptophan (200 μg/ml) was supplemented. The data represent the mean ± SD (n = 3) (48 h)