Figure 3. SO₂ production and resistance in dominant and non-dominant strains.

(A) Strains, pre-grown in YPD with geneticin, were inoculated into grape juice with (dotted lines) or without 60 mg/l SO₂ (continuous lines) to evaluate the SO₂ resistance, and growth was monitored spectrophotometrically according to the time. The average value of the biological triplicates is shown, and the standard deviation was below 10%. Strains containing empty plasmid were used as a control. (B) SO₂ production, after grape juice fermentation, was measured in the dominant and non-dominant strains. The average values of the biological triplicates and the standard deviation are shown. The differences between the two strains were statistically significant (p < 0.05, Fisher exact test).