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Rapid Increase in Deep Supercooling of Xylem Parenchyma ¹

Forest Resources Department, University of Minnesota, St. Paul, Minnesota 55108

Malus pumila Mill. twigs were collected from September through December and stored at 5°C until the low temperature exotherms of the xylem were determined by differential thermal analysis. During the differential thermal analysis, cooling was interrupted, and temperatures of 5 to –18°C were held for 0.4 to 10 hours before cooling to –50°C was resumed. Control twigs were cooled to –50°C without interruption. Holding the twigs at 1.3 to –5°C shifted the start of the low temperature exotherm from about –20 to –30°C. Slightly higher (2.6°C) and lower (–10°C) temperatures were occasionally effective. The shift began within 20 to 30 minutes and increased progressively to 150 minutes. The acclimation was reversibly inhibited by N₂ atmosphere.

¹ This work authorized as Scientific Journal Series Paper No. 11309, Minnesota Agricultural Experiment Station.

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