Fig. 6

Ethanol tolerance of S. cerevisiae induced by AHLs. Aliquots (4 μL) of tenfold serial dilution of the S. cerevisiae resting cells were spotted onto YPD plates, YPD plates plus 6% (8%) ethanol, and YPD plates supplemented with 6% (8%) ethanol and 2 μM AHLs, respectively, and grown at 30 °C for 10 days. The left-to-right colonies represented the tenfold gradient dilution of 10⁰, 10⁻¹, 10⁻², and 10⁻³, respectively