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Ethylene-Induced Lateral Expansion in Etiolated Pea Stems ¹

Kinetics, Cell Wall Synthesis, and Osmotic Potential

Department of Biology, University of Santa Clara, Santa Clara, California 95053, Biology Department, Thimann Laboratories, University of California, Santa Cruz, California 95064

Treatment of etiolated pea (Pisum sativum L.) internode tissue with ethylene gas inhibits elongation and induces lateral expansion. Precise kinetics of the induction of this altered mode of growth of excised internode segments were recorded using a double laser optical monitoring device. Inhibition of elongation and promotion of lateral expansion began after about 1 hour of treatment and achieved a maximum by 3 hours. Similar induction kinetics were observed after treating internodes with colchicine and 2,6-dichlorobenzonitrile, an inhibitor of cellulose synthesis. In sealed flask experiments, ethylene had no detectable effect on incorporation of label from [¹⁴C]glucose into any of the classical pectin, hemicellulose, or cellulose wall fractions. Ethylene inhibited fresh weight increase (total cell expansion) of both excised internode segments (in sealed flasks) and intact seedlings. Ethylene treatment resulted in an increase in cell sap osmolality in those tissues (intact and excised) which are inhibited by the gas. A model for ethylene-induced inhibition of elongation and induction of lateral expansion is presented.

¹ Supported by grant PCM 80-01168 from the National Science Foundation to L. T. and by a grant from Research Corporation to W. E.

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