Induction of Systemic Acquired Resistance by Heat Shock Treatment in Arabidopsis

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  • KUSAJIMA Miyuki
    Department of Applied Biology and Chemistry, Tokyo University of Agriculture RIKEN Innovation Center, RIKEN Faculty of Agriculture, Ibaraki University
  • KWON Soonil
    Department of Global Agricultural Sciences, The University of Tokyo
  • NAKAJIMA Masami
    Faculty of Agriculture, Ibaraki University
  • SATO Tatsuo
    Faculty of Agriculture, Ibaraki University
  • YAMAKAWA Takashi
    Department of Global Agricultural Sciences, The University of Tokyo
  • AKUTSU Katsumi
    Faculty of Agriculture, Ibaraki University
  • NAKASHITA Hideo
    Department of Applied Biology and Chemistry, Tokyo University of Agriculture RIKEN Innovation Center, RIKEN

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  • Induction of Systemic Acquired Resistance by Heat Shock Treatment in <i>Arabidopsis</i>

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説明

Systemic acquired resistance (SAR) is a potent innate immunity system in plants and has been used in rice fields. Development of SAR, involving priming, is achieved by activation of salicylic acid (SA)-mediated pathway. To determine whether heat shock (HS) treatment can induce SAR, we analyzed the effects of HS on Arabidopsis. HS treatment induced disease resistance, expression of SAR marker genes, and SA accumulation in wild-type but not in SA-deficient sid2 and NahG plants, indicating induction of SAR. Time course analysis of the effects of HS indicated that SAR was activated transiently, differently from biological induction, with a peak at 2–3 d after HS, and that it ceased in several days. Production of reactive oxygen species was observed before SA biosynthesis, which might be a trigger for SAR activation. The data presented here suggest that HS can induce SAR, but there exist unknown regulation mechanisms for the maintenance of SAR.

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