So that the H2O2 level and superficial scald were higher in EHF than that in LHF, Diphenylamine (DPA), an antioxidant, had no effects on SOD and CAT activity, but inhibited lignin synthesis and decreased superficial scald singificantly.

• 抗氧化剂二苯胺对SOD和CAT无影响；但显著抑制木质素合成；降低H_2O_2水平；减少发病率.