The Role in Ozone Phytotoxicity of the Evolution of Ethylene upon Induction of 1-Aminocyclopropane-1-carboxylic Acid Synthase by Ozone Fumigation in Tomato Plants
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概要
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The rate of evolution of ethylene by tomato plants was rapidly increased by O_3 fumigation. The time course of the increase in 1-aminocyclopropane-1-carboxylic acid (ACC) synthase activity was the same as that in the rate of evolution of ethylene, suggesting that ACC synthase activity might be a rate-limiting step in the evolution of ethylene that is caused by O_3 fumigation. The rate of the O_3-induced evolution of ethylene was increased by the application of ACC to tomato plants, suggesting the involvement of ACC oxidase in the O_3-induced evolution of ethylene. Treatment of plants with tiron inhibited the evolution of ethane, but not of ethylene. These results indicated that evolution of ethylene in O_3-treated tomato plants might result from enzymatic reactions catalyzed by both ACC synthase and ACC oxidase, but not from stimulation by O_3 of the peroxidation of lipids mediated by free radicals. Pretreatment of leaves with aminoethoxyvinylglycine (AVG), an inhibitor of ACC synthase, significantly inhibited the evolution of ethylene that was induced by O_3 and concomitantly reduced the extent of O_3-induced visible damage to leaves. Treatment with 2,5-norbonadiene, an in-hibitor of the action of ethylene, strongly reduced the ex-tent of visible damage caused by O_3, even though it did not suppress the evloution of ethylene. These results indicate that ethylene acts on certain metabolic processes to cause visible damage.
- 日本植物生理学会の論文
著者
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KONDO Noriaki
Regional Environment Division, National Institute for Environmental Studies
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Nakajima Nobuyoshi
Regional And Community Environment Division National Lnstitute For Environmental Studies
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Bael Gong
Institute of Applied Biochemistry, University of Tsukuba
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Ishizuka Kozo
Institute of Applied Biochemistry, University of Tsukuba
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Bael Gong
Institute Of Applied Biochemistry University Of Tsukuba
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Ishizuka Kozo
Institute Of Applied Biochemistry University Of Tsukuba
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Ishizuka Kozo
Institute Of Applied Biochemistry The University Of Tsukuba
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Kondo Noriaki
Regional And Community Environment Division National Lnstitute For Environmental Studies
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