Protective effects of ethylene and salicylic acid against ozone exposure in Arabidopsis

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  • Yoshida Seiji
    Graduate School of Life and Environmental Sciences, University of Tsukuba National Institute for Environmental Studies
  • Tamaoki Masanori
    Graduate School of Life and Environmental Sciences, University of Tsukuba National Institute for Environmental Studies
  • Ogawa Daisuke
    National Institute for Environmental Studies
  • Aono Mitsuko
    National Institute for Environmental Studies
  • Kubo Akihiro
    National Institute for Environmental Studies
  • Saji Hikaru
    National Institute for Environmental Studies
  • Nakajima Nobuyoshi
    Graduate School of Life and Environmental Sciences, University of Tsukuba National Institute for Environmental Studies

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  • オゾン暴露したシロイヌナズナにおいてエチレンとサリチル酸は防御的な役割を持つ

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Abstract

Ozone is the photochemical oxidant that causes serious leaf injury. Ethylene and salicylic acid are known to act as signaling molecules that enhance and induce cell death in ozone-exposed plants. However, a few studies also report about the protective effects of ethylene and salicylic acid against ozone-induced injury. In this study, we investigated the protective effects using Arabidopsis mutants lacking either ethylene signaling (ein2) or salicylic acid biosynthesis (sid2). However, ozone-induced leaf in ein2 and sid2 mutants was unclear and unstable, we generated double mutants by crossing ozone-sensitive ascorbate deficient mutant (vtc1) and ein2 or sid2 mutant. Expression of ethylene and salicylic acid biosynthesis or inducible genes was highly induced with ozone in vtc1 as compared to that in wild type. The vtc1 mutant also showed high levels of ethylene evolution and salicylic acid accumulation by ozone, suggesting that the vtc1 mutant is suitable as a parental line to generate double mutants. Although vtc1 mutant was more sensitive to ozone than wild type, double mutants lacking ascorbate biosynthesis and phytohormone signaling showed higher level of leaf injury than vtc1. Thus far, our results indicate that these plant hormones have a role in protection of plants from ozone-induced leaf injury.

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