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Plant and Cell Physiology, 1996, Vol. 37, No. 2 129-134
© 1996

The Role in Ozone Phytotoxicity of the Evolution of Ethylene upon Induction of 1-Aminocydopropane-1-carboxylic Acid Synthase by Ozone Fumigation in Tomato Plants

Gong Young Bae1, Nobuyoshi Nakajima2, Kozo Ishizuka1 and Noriaki Kondo2

1Institute of Applied Biochemistry, University of Tsukuba 1-1-1 Tennodai, Tsukuba, Ibaraki, 305 Japan
2Regional and Community Environment Division, National Institute for Environmental Studies 16-2 Onogawa, Tsukuba, Ibaraki, Japan

The rate of evolution of ethylene by tomato plants was rapidly increased by O3 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 O3 fumigation. The rate of the O3-induced evolution of ethylene was increased by the application of ACC to tomato plants, suggesting the involvement of ACC oxidase in the O3-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 O3-treated tomato plants might result from enzymatic reactions catalyzed by both ACC synthase and ACC oxidase, but not from stimulation by O3 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 O3 and concomitantly reduced the extent of O3-induced visible damage to leaves. Treatment with 2,5-norbonadiene, an inhibitor of the action of ethylene, strongly reduced the extent of visible damage caused by O3, even though it did not suppress the evloution of ethylene. These results indicate that ethylene acts on certain metabolic processes to cause visible damage.

(Received September 7, 1995; Accepted December 18, 1995)
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