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Exposure to alcohol vapours reduces chilling-induced injury of excised cucumber cotyledons, but not of seedlings or excised hypocotyl segments

Cucumber (Cucumis sativus L. cv. Poinsett 76) seedlings with fully expanded cotyledons, and excised cotyledons, first true leaves, hypocotyl segments and fruit mesocarp discs were exposed to vapours from a series of aqueous alcohol solutions of 0 to 320 mM methanol, ethanol, n-propanol, n-butanol, and n-pentanol during chilling at 2.5 o C for 5 d. Certain concentrations of each alcohol reduced subsequent chilling-induced ion leakage from the cotyledons and leaves. Exposure of cotyledons to certain methanol or ethanol solutions also reduced chilling-induced ethylene production, but not carbon dioxide production. In contrast, exposing cucumber seedlings with fully expanded cotyledons to the same series of alcohol concentrations that resulted in reduced chilling-induced ion leakage and ethylene production of excised cotyledons actually increased chilling injury of the seedlings