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Plant and Cell Physiology, 1986, Vol. 27, No. 1 75-81
© 1986

Article

A Possible Regulation of Ethylene Production by the Epidermis in Mung Bean Hypocotyl Sections

Isao Todaka and Hidemasa Imaseki

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

IAA-induced and l-aminocyclopropane-l-carboxylic acid (ACC)-dependent ethylene production in etiolated mung bean (Vigna radiata [L] Wilczek) hypocotyl sections does not occur in epidermal cells (Todaka and Imaseki 1985). Mung bean hypocotyls contain a protein which inhibits auxin-induced ethylene biosynthesis in hypocotyl sections (Sakai and Imaseki 1975a, b). This inhibitory protein was also found to inhibit ACC-dependent ethylene production in hypocotyl sections, but not in hypocotyl sections from which the epidermis had been removed. Uptake of ACC by both unpeeled and peeled sections was not inhibited by the protein. Similarly, IAA-induced ethylene production was inhibited by the protein in unpeeled hypocotyl sections, but not in peeled sections. The protein was not inactivated in peeled sections, as protein synthesis by peeled sections was inhibited to the same extent as in unpeeled sections. The protein inhibited incorporation of 3,4-[14C]-methionine into ACC and ethylene in unpeeled sections, but not in peeled sections, whereas oxidation of the labeled methionine into CO2 was inhibited by the protein to a similar extent in both types of hypocotyl sections. KCN, a potent inhibitor of ethylene production, inhibited both IAA-induced and ACC-dependent ethylene production in both peeled and unpeeled hypocotyl sections. It is likely that the epidermis plays some role in controlling ethylene production which occurs in stem cells other than epidermal cells.

(Received July 16, 1985; Accepted October 21, 1985)
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