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Plant and Cell Physiology, 1985, Vol. 26, No. 5 865-871
© 1985

Article

Epidermal Cells Do Not Contribute to Auxin-Induced Ethylene Production in Mung Bean Stem Sections

Isao Todaka and Hidemasa Imaseki

Research Institute for Biochemical Regulation, Faculty of Agriculture, Nagoya University Chikusa, Nagoya 464, Japan

Auxin-induced and 1-aminocyclopropane-1-carboxylic acid (ACC)-dependent ethylene production in mung bean (Vigna radiata [L] Wilczek) hypocotyl sections, from which epidermis had been removed, was investigated. Ethylene production in hypocotyl sections without epidermis was induced by treatment with IAA, and also occurred from exogenously supplied ACC in the presence of 0.2 M mannitol. Isolated epidermal strips alone failed to produce substantial amounts of ethylene in response to IAA or from exogenous ACC. 3,4-[14C]-Methionone was incorporated into both ACC and ethylene in peeled sections treated with IAA, but not in the isolated epidermal strips. Radioactive ACC, however, was detected in the epidermal strips separated from the unpeeled sections previously fed with 3,4-[14C]-methionine in the presence of IAA. We conclude that the Site of auxin-induced ethylene production is not in the epidermis, but in other hypocotyl cells, and that epidermal cells lack the activity which converts ACC to ethylene.

(Received January 28, 1985; Accepted May 4, 1985)
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