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Characteristics of Cold Acclimation and Deacclimation in Tuber-bearing Solanum Species ¹

Laboratory of Plant Hardiness, Department of Horticultural Science and Landscape Architecture, University of Minnesota, Saint Paul, Minnesota 55108

The effect of temperatures on cold acclimation and deacclimation in foliage tissues was studied in Solanum commersonii (Oka 4583), a tuber-bearing potato. The threshold temperature for cold acclimation was about 12 C. In a temperature range of 2 to 12 C, the increase in hardiness was dependent on the acclimating temperature; the lower the acclimating temperature, the more hardiness achieved. A day/night temperature of 2 C, regardless of photoperiod, appeared to the optimum acclimating temperature for the Solanum species studied. A subfreezing temperature hardened plants less effectively. The maximum level of hardiness could be reached after 15 days of cold acclimation. However, it took only 1 day to deacclimate the hardened plants to a preacclimation level when plants were subjected to a warm regime from cold. The degree of deacclimation was dependent on the temperature of the warm regime.

Based on cold tolerance and the capacity to acclimate to cold, tuber-bearing Solanum species could be grouped into five categories. Chilling injury was also observed in some of the tuber-bearing Solanum species.

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