Tolerance to freezing is the most common strategy for plants to survive freezing stress. The ability to increase freezing tolerance in response to low nonfreezing temperatures, i.e. cold acclimation, is essential for plants to overwinter in temperate habitats. Cold acclimation is thought to be governed by a complex of genes, inducible by low temperatures, and involves a number of changes that could protect plant cells against freezing stress. Synthesis of the products of cold-regulated genes leads to the final increase in freezing resistance. Because of the complexity of the changes required to achieve maximal cold hardiness, many genes may be involved in the overall process of cold acclimation.
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