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Ethanol Concentration in Tomato Plants during Soil Flooding¹

Tomato plants were studied to assess the potential value of ethanol accumulation in .plant tissue as a measure of O3 stress resulting from short periods of soil flooding. Ethanol concentration in xylem exudate was markedly associated with air temperature, and to a lesser extent with light intensity and soil temperature under conditions of flooding. Field flooding results agreed closely with simulated environments.

A small amount of ethanol was eliminated by transpiration from flooded tomato plants under environmental conditions that favored accumulation. A slightly higher amount of ethanol was excreted from the roots.

Ethanol in tomato plant samples appeared to indicate the intensity of O₂ deficiency during flooding by reflecting both soil O₂ supply and environmental effects, and could serve as a useful indicator in relating tomato plant injury to flooded conditions.

Key Words: Soil aeration • Environment • Flooding • Tomatoes • Ethanol

² Former Graduate Research Assistant (now Soil Scientist, Canada Department of Agriculture, Woodslee, Ontario, Canada); and Professor of Soil Science, Michigan State University.

Received for publication August 2, 1969.