Glucosinolate Degradation Products, Isothiocyanates, Nitriles, and Thiocyanates, Induce Stomatal Closure Accompanied by Peroxidase-Mediated Reactive Oxygen Species Production in <i>Arabidopsis thaliana</i>

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  • HOSSAIN Mohammad Shakhawat
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University
  • YE Wenxiu
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University
  • HOSSAIN Mohammad Anowar
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University
  • OKUMA Eiji
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University
  • URAJI Misugi
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University
  • NAKAMURA Yoshimasa
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University
  • MORI Izumi C.
    Institute of Plant Science and Resources, Okayama University
  • MURATA Yoshiyuki
    Graduate School of Natural Science and Technology, Division of Bioscience, Okayama University

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  • Glucosinolate Degradation Products, Isothiocyanates, Nitriles, and Thiocyanates, Induce Stomatal Closure Accompanied by Peroxidase-Mediated Reactive Oxygen Species Production in Arabidopsis thaliana

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Abstract

Isothiocyanates, nitriles, and thiocyanates are degradation products of glucosinolates in crucifer plants. In this study, we investigated the stomatal response to allyl isothiocyanate (AITC), 3-butenenitrile (3BN), and ethyl thiocyanate (ESCN) in Arabidopsis. AITC, 3BN, and ESCN induced stomatal closure in the wild type and the atrbohD atrbohF mutant. Stomatal closure was inhibited by catalase and salicylhydroxamic acid (SHAM). The degradation products induced extracellular reactive oxygen species (ROS) production in the rosette leaves, and intracellular ROS accumulation, NO production, and cytosolic free calcium concentration ([Ca2+]cyt) oscillations in guard cells, which were inhibited by SHAM. These results suggest that glucosinolate degradation products induce stomatal closure accompanied by extracellular ROS production mediated by SHAM-sensitive peroxidases, intracellular ROS accumulation, and [Ca2+]cyt oscillation in Arabidopsis.

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