Journal
MOLECULAR PLANT PATHOLOGY
Volume 9, Issue 4, Pages 525-529Publisher
WILEY
DOI: 10.1111/J.1364-3703.2008.00477.X
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Flagellin is a component of bacterial flagella and acts as a proteinaceous elicitor of defence responses in organisms. Flagellin from a phytopathogenic bacterium, Acidovorax avenae strain N1141, induces immune responses in suspension-cultured rice cells. To analyse the function of flagellin in rice, we fused the N1141 flagellin gene to the cauliflower mosaic virus 35S promoter and introduced it into rice. Many of the resulting transgenic rice plants accumulated flagellin at various levels. The transgenic rice developed pale spots in the leaves. The expression of a defence-related gene for phenylalanine ammonia-lyase was induced in the transgenic plants, and H2O2 production and cell death were observed in some plants with high levels of gene expression, suggesting that the flagellin triggers immune responses in the transgenic rice. Transgenic plants inoculated with Magnaporthe grisea, the causal agent of rice blast, showed enhanced resistance to blast, suggesting that the flagellin production confers disease resistance in the transgenic rice.
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