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Effect of B. subtilis PM32 on stem discoloration, SOD, POD and CAT of potato plants under biotic stress R. solani. Control (un-inoculated plants), T1 (B. subtilis PM32 inoculation), T2 (B. subtilis PM32 and R. solani infection), T3 (R. solani infection), T4 (Fungicide (KOCIDE 3000) and R. solani infection). The means with same letter(s) are not significantly different at p ≤ 0.05. The bars show standard error of mean values (n = 3)
