Abstract
The validity of the use of plasmolysis and desiccation tests for estimating the resistance of the bark tissue of the black locust to injury by extracellular freezing was examined and established by comparison of such tests with actual freezing tests performed under natural and standardized laboratory conditions. Current concepts of the mechanism of frost injury to plants are discussed in relation to the use of these dehydration tests for estimating the relative frost-hardiness of plant tissues.