Plant immune activator protein PlAvh23 secreted by peronophythora litchii and application of plant immune activator protein PlAvh23

The invention discloses a plant immune activator protein PlAvh23 secreted by peronophythora litchii and an application of the plant immune activator protein PlAvh23. A novel peronophythora litchii RXLR type effect protein PlAvh23 is identified, and the amino acid sequence of the novel peronophythora litchii RXLR type effect protein PlAvh23 is selected from any one of the following sequences: (a) an amino acid sequence as shown in SEQ ID NO: 1; (b) an amino acid sequence as shown in SEQ ID NO: 4; and (c) an amino acid sequence as shown in SEQ ID NO: 6. The plant immune activator protein PlAvh23 can induce plants to generate immune response, reduces infection of pathogenic bacteria, provides a new way for improving plant resistance, and can be applied to prevention and treatment of litchi downy blight. 本发明公开了一种由荔枝霜疫霉分泌的植物免疫激活蛋白PlAvh23及其应用。本发明鉴定了一个新的荔枝霜疫霉RXLR类效应蛋白PlAvh23，其氨基酸序列选自如下任一序列：(a)如SEQ ID NO：1所示的氨基酸序列；(b)如SEQ ID NO：4所示的氨基酸序列；(c)如SEQID NO：6所示的氨基酸序列。该植物免疫激活蛋白PlAvh23能够诱导植物产生免疫反应，减少病原菌的侵染，为提高植物抗性提供了新途径，可以应用于