FIG.3.

Survival of mutant strains displaying multiple stress resistance defects. Exposure to stress and determination of survival rates were performed as described in the legend to Fig. 2. The values are arithmetic means and standard errors of the means. All stresses for which the sensitivity increased significantly compared to wild-type strain 168 are shown. (A) Mutants significantly (α ≤ 0.01) impaired in survival after three stresses. (B) Stress resistance profile of the yflA mutant that displayed increased sensitivity to all stresses tested. ▴, wild-type strain 168; □, sigB mutant strain ML6; ×, mutants defective in individual general stress genes. EtOH, ethanol.