H2O2 tolerance of the yeast trx1, trx2 mutant expressing GmTRX. Transformed cells were streaked on SD/Gal/−Ura agar medium containing 0 mm H2O2 (A) and 0.7 mm H2O2 (B). 1, Saccharomyces cerevisae strain EMY63 (thioredoxin double mutant); 2, S. cerevisae strain EMY60 (parent) transformed with YCpIF5; 3, S. cerevisae strain EMY63 transformed with YCpIF5 control; 4, S. cerevisae strain EMY63 transformed with YCpIF5 expressing GmTRX.