Fig. 2

Titer (mg/L) and Optical density (OD₆₀₀) of α-ionone production by different strains. A Strains AI_0000 and AI_2211 were cultured in the 1 ml defined medium, shaken at 300 rpm in snap-cap tube. B Strain AI_2211 were cultured under the conditions with 1 ml defined medium, shaken at 300 rpm in snap-cap tubes or 10 ml defined medium, shaken at 100 or 300 rpm in flasks. Strain AI_3211 were cultivated in the 10 ml defined medium in shaking flasks at 100 or 300 rpm. The data were an average of duplicate data. The titers were statistically analyzed by one-way ANOVA: ns, P > 0.05; * P < 0.05; ** P < 0.01; *** P < 0.001