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Environmental and Stress Physiology

Abscisic Acid Increases Terrestrial Plant Cell Resistance to Hydrostatic Pressure ¹

Department of Horticulture Science, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0, Department of Horticulture Science, Oregon State University, Corvallis, Oregon 97331

Cells of the terrestrial plant species bromegrass (Bromus inermis L.) are not naturally adapted to withstand the hydrostatic pressures encountered in aquatic environments. However, after treatment with the natural plant growth hormone abscisic acid (75 micromolar), bromegrass cells survived a hydrostatic pressure of 101.3 megapascals, approximating the limits of ocean depth (10,860 m). The increased resistance to hydrostatic pressure from 1 to 7 days of abscisic acid treatment paralleled the induced elevation of cell tolerance to freezing stress.