Flagellin is a globular protein that arranges itself in a hollow cylinder to form the filament in a bacterial flagellum. It has a mass of about 30,000 to 60,000 daltons. Flagellin is the principal component of bacterial flagellum, and is present in large amounts on nearly all flagellated bacteria.
The invention discloses pseudomonas aeruginosa flagellin for improving disease resistance of plants as well as a coding gene and application of the pseudomonas aeruginosa flagellin. An amino acid sequence of the protein is shown in SEQ ID NO:1 or is an amino acid sequence which is obtained by substituting, deleting and / or adding one or more amino acids to the amino acid sequence shown in the SEQ ID NO:1 and can express the same functional protein; and a nucleotide sequence of the gene coding the protein is shown in SEQ ID NO:2 or is a nucleotide sequence which is obtained by substituting, deleting and / or adding one or more nucleotides to the nucleotide sequence shown in the SEQ ID NO:2 and can code the same functional protein. As an immunityelicitor, the protein can remarkably improve disease resistance of plants, has low use concentration, takes effects quickly and can effectively reduce the agricultural production cost.