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Interactions of Low Temperature, Water Stress, and Short Days in the Induction of Stem Frost Hardiness in Red Osier Dogwood ¹

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

The induction of stem frost hardiness by low temperature, water stress, short days, and their combinations in 2- and 4-month-old growing dogwoods (Cornus stolonifera) were investigated. When plants were subjected to more than one factor, the increased hardiness was the sum of the effects of the individual factors involved. No interactions among these factors on hardiness were observed during a 3-week treatment. Results indicate that low temperature, water stress, and short days initially trigger independent frost-hardening mechanisms. Plant ages significantly influenced the change in low temperature-induced frost hardiness, but not the water stress or short day-induced frost hardiness.

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