ROS and JA signaling participate in positive regulation of Pyrus betulifolia LysM-containing receptor protein 1 (PbeLYP1) in Valsa canker resistance

Valsa canker, caused by the necrotrophic fungus Valsa species, is one of the most destructive diseases that threatens the development of apple and pear production. The discovery of resistance genes is helpful for resistance breeding and for carrying out control measures. In this study, we identified a LysM-Containing Receptor Protein 1 ( PbeLYP1 ) in the Valsa -resistant rootstock Pyrus betulifolia . Expression assays revealed that PbeLYP1 was induced by both Valsa pyri ( Vp ) and Vp metabolism ( Vp M). The transient expression on pear fruit and stably transformed suspension cells confirmed the positive role of PbeLYP1 in resistance to Valsa canker. Key genes related to reactive oxygen species (ROS) and jasmonic acid (JA) signaling were significantly induced in PbeLYP1 -overexpressing cell lines. In conclusion, PbeLYP1 positively regulates Valsa canker resistance,which is associated with the induction of ROS and JA signaling.