TABLE 1.

Effects of oxidative stress agents on wild-type and htrA mutant strains, as measured by disc diffusion assays

Temp (°C)Oxidative stress agentMean diam (mm) of inhibition zone ± SD fora:No. of samples
Wild typeΔhtrA mutanthtrA(S197A) mutant
37H2O268 ± 5.381 ± 7.1**79 ± 11*7
Cumene hydroperoxide76 ± 6.988 ± 10*88 ± 8.2*7
Paraquat58 ± 4.670 ± 2.2**66 ± 5.24
42H2O259 ± 5.977 ± 5.7***72 ± 7.0**7
Cumene hydroperoxide73 ± 6.691 ± 6.9***91 ± 11**7
Paraquat50 ± 2.464 ± 1.4***63 ± 2.0***4
  • a Asterisks indicate significant differences from results for the wild type, based on Student's t test, as follows. *, P < 0.05; **, P < 0.01; ***, P < 0.001.