Tea polyphenol is a potential antifungal agent for the control of obligate biotrophic fungus in plants

摘要

Tea polyphenol (TP) exhibits broad-spectrum antimicrobial properties. In this study, the invitro and invivo antifungal activities of TP on Puccinia striiformis f.sp. tritici (Pst), which is an obligate biotrophic fungus that causes severe wheat stripe rust disease, were evaluated to investigate the control efficacy of TP. Invitro experiments showed that, at a concentration of 1.0 mg/ml, TP significantly suppressed urediniospore germination and caused the aberrant growth of germ tubes. The inhibition ratio reached 100% by increasing the TP concentration. Invivo experiments showed that TP reduced incidence rate and the uredia coverage rate in a dose- and application time-dependent manner. TP treatment also induced the aberrant differentiation of Pst on wheat leaves. Results suggest that the ideal TP concentration range is 20-40 mg/ml, and TP may be a potential antifungal agent for the control of obligate biotrophic fungus in plants.