Effect of powdery mildew on interleaf microbial communities and leaf antioxidant enzyme systems

Abstract Chinese peony ( Paeonia lactiflora Pall.) is both medicinally and aesthetically beneficial. Powdery mildew a common fungal disease that seriously jeopardizes the value of numerous species, including peonies as crop. In order to provide basis for prevention treatment powdery mildew, we examined microbial diversity, malondialdehyde (MDA) concentrations antioxidant enzyme activities leaves infected with three levels determine any modifications leaf's systems community structure following onset disease. The results show MDA content rose degree infection became worse. Antioxidant activity then declined. Following initiation diversity decreased, whereas there was not appreciable change in bacterial communities according sequencing. relative abundance more than half species genera displaying abundant diminished less pronounced alterations their after spread. Significant different taxa were critical organization each microbiome found. Correlation analysis showed pathogenic genus Erysiphe correlated those 11 one genus. Among them, Aureobasidium , Neosetophoma Sclerostagonospora significant positive correlations MDA.