The induced resistance of Serratia marcescens strain YBS106 isolated from Arisaema erubescens (Wall.) Schott tissue to cotton Fusarium and Verticillium wilt was studied by measuring the change of the activities of defense enzymes (POD, PPO) and the contents of pathogenesis-related biochemicals (MDA, Vc) in cotton leaf inoculation with YBS106, Fusarium oxysporum, Verticillium dahliae and the control effects of strain YBS106 against to F. oxysporum and V. dahliae in pot tests. The results indicated that YBS106 effectively increased POD and PPO activities, also promoted concentration of MDA and Vc. When the F. oxysporum or V. dahliae used with YBS106, respectively, the induced activities of POD, PPO and concentration of Vc were higher than that of only used F. oxysporum or V. dahliae, but concentration of MDA were lower. The concentration of MDA and Vc peaked 5 days after the treatment while the activities of POD and PPO reached their maximum 10 days after the treatment. The relative anti-bacterial effects of strain YBS106 against to F. oxysporum and V. dahliae in pot tests when 100 day inoculated pathogen were 64.24% and 71.37%, which is related to changes consistent trend of the defense enzymes activity and related substances (MDA and Vc) content. Systemic resistance in cotton against to Fusarium oxysporum and Verticillium dahliae could be induced by the antagonistic bacteria Serratia marcescens strain YBS106.
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