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The toxic effects of five kinds of compounds produced by Vmm on tobacco leaves. 20% methanol (v/v) (A) shows no symptom, while protocatechuic acid (B); p-hydroxybenzoic acid (C); p-hydroxyacetophenone (D); 3-(p-Hydroxyphenyl)propanoic acid (E); and phloroglucinol (F) produce necrosis lesions in different sizes. The concentrations of all the compounds is 10 mmol/L.
