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Fusarium oxysporum  is an important soilborne fungal pathogen with many different formae speciales that can colonize the plant vascular system and cause serious crop wilt disease worldwide. We found a glycoside hydrolase family 12 protein FoEG1, secreted by  F. oxysporum , that acted as a pathogen‐associated molecular pattern (PAMP) targeting the apoplast of plants to induce cell death. Purified FoEG1 protein triggered cell death in different plants and induced the plant defence response to enhance the disease resistance of plants. The ability of FoEG1 to induce cell death was mediated by leucine‐rich repeat (LRR) receptor‐like kinases BAK1 and SOBIR1, and this ability was independent of its hydrolase activity. The mutants of cysteine residues did not affect the ability of FoEG1 to induce cell death, and an 86 amino acid fragment from amino acid positions 144 to 229 of FoEG1 was sufficient to induce cell death in  Nicotiana benthamiana . In addition, the expression of  FoEG1  was strongly induced in the early stage of  F. oxysporum  infection of host plants, and  FoEG1  deletion or loss of enzyme activity reduced the virulence of  F. oxysporum . Therefore, our results suggest that FoEG1 can contribute to the virulence of  F. oxysporum  depending on its enzyme activity and can also act as a PAMP to induce plant defence responses.

FoEG1, a secreted glycoside hydrolase family 12 protein from Fusarium oxysporum , triggers cell death and modulates plant immunity