A Pyrazole Derivative Induce Systemic Acquired Resistance with a New Type of Action

Abstract

Several chemicals are identified to induce systemic acquired resistance (SAR) in plants. We analyzed the mode of action of a new pyrazole derivative for the induction of SAR. This compound induced disease resistance against a broad range of pathogens in rice, tobacco and Arabidopsis, and induced the expression of PR genes and SA accumulation in tissues. These results indicated that this compound stimulate upstream of SA in the SAR signaling pathway, as does probenazole (PBZ). The gene expression patterns in microarray analyses using Arabidopsis suggested that this pyrazole derivative induces SAR in a different manner from that of PBZ.