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Articles

Freezing of Nonwoody Plant Tissue

II. Cell Damage and the Fine Structure of Freezing Curves ^1,2,3

^a Agricultural Research Service, United States Department of Agriculture, Western Regional Research Laboratory, Berkeley, California 94710

Temperature recordings of the freezing of plant tissues include two plateaus or regions of reduced slope. During the second of these, small positive spikes were observed. When a completely frozen tissue was thawed and refrozen, neither the second plateau nor the spikes were recorded. Both were present, however, if the initial freezing had been terminated before the second plateau had been reached. The spikes appear to represent the release of heat of crystallization during the freezing of individual cells. Such a freezing and thawing cycle destroys the ability of the cells to remain supercooled in the presence of the ice that is formed as the first plateau is recorded.

² Portions of the content of this article were communicated to the XIII International Congress of Refrigeration (3).

³ Portions of this work were submitted in partial fulfillment of the requirements for the degree of Master of Science in Food Science, University of California, Berkeley, by E. Sa B. P.