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Plant Physiology 54:29-35 (1974)
© 1974 American Society of Plant Biologists

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Articles

Supercooling in Overwintering Azalea Flower Buds 1

Milon F. George, Michael J. Burke and Conrad J. Weiser2

a Laboratory of Plant Hardiness, Department of Horticultural Science, University of Minnesota, St. Paul, Minnesota 55101

Differential thermal analysis and nuclear magnetic resonance spectroscopy experiments on whole flower buds and excised floral primordia of azalea (Rhododendron kosterianum, Schneid.) proved that supercooling is the mode of freezing resistance (avoidance) of azalea flower primordia. Increase in the linewidth of nuclear magnetic resonance spectra for water upon thawing supports the view that injury to the primordia occurs at the moment of freezing. Nonliving primordia freeze at the same temperatures as living primordia, indicating that morphological features of primordial tissues are a key factor in freezing avoidance of dormant azalea flower primordia. Differential thermal analyses was used to study the relationship of cooling rate to the freezing points of floral primordia in whole flower buds. At a cooling rate of 8.5 C per hour, primordia in whole buds froze at about the same subfreezing temperatures as did excised primordia cooled at 37 C per hour. At more rapid cooling rates primordia in intact buds froze at higher temperatures.

2 Present address: Department of Horticulture, Oregon State University, Corvallis, Ore. 97331.

1 Scientific Journal Series Paper 8449 of the Minnesota Agricultural Experiment Station. The authors express appreciation to the Albert Nerken Foundation for support of this research.






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