Pyrazolecarboxylic Acid Derivative Induces Systemic Acquired Resistance in Tobacco

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  • YASUDA Michiko
    <i>Laboratory for Growth Regulation, Plant Science Center, RIKEN</i> <i>Graduate School of Science and Engineering, Saitama University</i>
  • NISHIOKA Masanori
    <i>Biological Research Laboratories, Nissan Chemical Industries, LTD.</i> <i>Microbial Toxicology Laboratory, RIKEN</i>
  • NAKASHITA Hideo
    <i>Plant Functions Laboratory, RIKEN</i> <i>Microbial Toxicology Laboratory, RIKEN</i>
  • YAMAGUCHI Isamu
    <i>Microbial Toxicology Laboratory, RIKEN</i> Present address: <i>Laboratory for Remedition Research, Plant Science Center, RIKEN</i>
  • YOSHIDA Shigeo
    <i>Laboratory for Growth Regulation, Plant Science Center, RIKEN</i> <i>Plant Functions Laboratory, RIKEN</i> <i>Graduate School of Science and Engineering, Saitama University</i>

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  Systemic acquired resistance (SAR) is a potent innate immunity system in plants that is induced through asalicylic 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.<br>

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