Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 67, Issue 12, Pages 2614-2620Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.67.2614
Keywords
Nicotiana tabacum; salicylic acid; systemic acquired resistance; pathogenesis-related gene; Pseudomonas syringae pv. tabaci
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Systemic acquired resistance (SAR) is a potent innate immunity system in plants that is induced through a salicylic acid (SA)-mediated pathway. Here, we characterized 3-chloro-1-methyl-1H-pyrazole-5-carboxylic acid (CMPA) as an effective SAR inducer in tobacco. Soil drench application of CMPA induced PR gene expression and a broad range of disease resistance without antibacterial activity in tobacco. Both analysis of CMPA's effects on NahG transgenic tobacco plants and SA measurement in wild-type plants indicated that CMPA-induced resistance enhancement does not require SA. Therefore, it is suggested that CMPA induces SAR by triggering the signaling at the same level as or downstream of SA accumulation as do both benzo(1,2,3)thiadiazole-7-carbothioic acid S-methyl ester and N-cyanomethyl-2-chloroisonicotinamide.
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