Plant Extracts Induced Resistance to Fusarium oxysporum f.sp. lycopersici in Tomato

Tomato (Lycopersicon esculentum Mill.) is the most consumed vegetable in world after potato. In Cameroon, plant cultivated almost all agroecological areas, however, yields remain low due to attacks by various pathogens and insects. Among pathogens, Fusarium oxysporum f.sp. lycopersici (FOL) a phytopathogenic fungus responsible for wilt, disease enormous economic losses. To contribute control of this microbial pathogen, stimulatory effect tomato defence system extracts some plants tomato/FOL interaction was evaluated. were treated with aqueous (AE) Callistemon citrinus (C. citrinus), Cymbopogon citratus citratus), Oxalis barrelieri (O. ). After 4 days spraying extracts, inoculated virulent strain under controlled conditions. roots used determine contents hydrogen peroxide (H2O2), phenols malondialdehyde (MDA). The activities main antioxidant enzymes also evaluated roots: catalase (CAT), phenylalanine ammonia lyase (PAL), peroxidase (POX) superoxide dismutase (SOD). results showed that treatment their infection FOL induced an increase H2O2, MDA roots; PAL, POX, SOD reduction CAT activity. Our suggest enzymatic activities, synthesis metabolites could mitigate oxidative damage takes place during expansion pathogen. Aqueous C. citrinus, O. at 10% (W/V) be as natural products stimulate against FOL. These development induce resistance FOL, thus improving productivity, quantity quality production.