Salicylic Acid Induces Extracellular Superoxide Generation Followed by an Increase in Cytosolic Calcium Ion in Tobacco Suspension Culture : The Earliest Events in Salicylic Acid Signal Transduction

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概要

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• Addition of salicylic acid (SA) to tobacco (Nicotiana tabacum) suspension culture immediately induced a rapid and transient generation of superoxide anion (O^-_2), followed by a transient increase in cytosolic free calcium ion concentration ([Ca^<2+>]_c). The level of SA-induced O^-_2 was lowered by treatment with several scavengers of active oxygen species and a peroxidase inhibitor, but not with an NADPH oxidase inhibitor. The SA-induced [Ca^<2+>]_c elevation was also lowered by inhibitors which effectively lowered the O^-_2 level. Inhibition of [Ca^<2+>]_c elevation by Ca^<2+> channel blockers and a Ca^<2+> chelator indicated that extracellular Ca^<2+> was responsible for the increased [Ca^<2+>]_c. Among the several SA analogs, only compounds that actively induced the O^-_2 generation also elevated [Ca^<2+>]_c. In addition, the inhibitory effects of SA analogs on catalase activity correlated well with their effects on the O^-_2 generation and the [Ca^<2+>]_c elevation. SA-dependent O^-_2 generation was shown to occur extracellularly, requiring both H_2O_2 and at least one proteinaceous factor excreted from the cells. This factor was determined to be a salicylhydroxamic acid-sensitive extracellular guaiacolutilizing peroxidase.

• 日本植物生理学会の論文

著者

• Uozumi N

  Nagoya Univ. Nagoya Jpn

• KAWANO Tomonori

  Graduate School of Bioagricutural Sciences, Nagoya University

• Muto S

  Bioscience Center Nagoya University

• Muto Shoshi

  Graduate School Of Bioagricultural Sciences Nagoya University

• Uozumi Nobuyuki

  Graduate School Of Bioagricultural Sciences

• TAKAHASHI Koji

  School of Informatics and Sciences, Nagoya University

• Kawano T

  Department Of Biological And Environmental Chemistry Faculty Of Agriculture Tottori University

• Sahashi Nobuya

  Graduate School of Bioagricultural Sciences, Nagoya University

• Muto Shoshi

  Graduate School Of Bioagricultural Sciences

• Sahashi Nobuya

  Graduate School Of Bioagricultural Sciences Nagoya University:(present Address)isehara Research Labo

• Takahashi Koji

  School Of Chemical Engineering The University Of Birmingham

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