Identification of putative plant defense activators of novel mode of action.

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Plant defense activators are chemicals that induce disease resistance by enhancing plant immunity upon pathogen infection. Defense signaling pathways induced by cryptogein, a proteinaceous elicitor derived from a pathogenic oomycete, in tobacco BY-2 cells has been extensively studied as a simple model system. Based on the correlation between the temporal pattern of enzymatic production of reactive oxygen species (ROS) and downstream defense responses, we established a new high-throughput screening method to identify novel lead compounds for plant defense activators. From a total of 11,000 compounds screened, we selected 58 candidates for activators. We further examined the effects of selected compounds on the expression of defense-related genes in Arabidopsis plants, and discovered some chemicals that potentially enhance jasmonic acid-dependent signaling pathway as putative plant defense activators with a novel mode of action.