Antagonistic Activity and Potential Mechanisms of Endophytic Bacillus subtilis YL13 in Biocontrol of Camellia oleifera Anthracnose

Anthracnose, caused by the fungus Collectotrichum fructicola (C. fructicola), is a major disease affecting quality and yield of Camellia oleifera oleifera); it reduces C. 40%–80%. Bacillus subtilis (B. subtilis) YL13 an antagonistic endophytic bacteria strain isolated from healthy leaves. This study was aimed at investigating potential for biocontrol anthracnose possible mechanisms involved. In in vitro assays, demonstrated remarkable activity fructicola. Its cell-free filtrates displayed activity, which suggested that metabolites might play important roles. vivo tests showed index YL13-treated plants obviously reduced under greenhouse conditions. secretes variety bioactive metabolites, including protease, cellulase, siderophore, participate resistance to addition, treated with fermentation broth different defense responses, e.g., accumulation hydrogen peroxide (H2O2) activation defense-related enzyme peroxidase (POD), contribute directly or indirectly overcome external stresses. The significant effect host defense-induction this B. as well its have be exploited microbial control agents efficient management anthracnose.