Abstract

Summary The data presented show that many chemical changes occur in the overwintering parts of plants during the development of frost hardiness and that differences exist among species. However, there is still a question as to whether these alterations in plant metabolism are intimately involved in the development of frost hardiness or whether they are merely associated changes. Of the chemical constituents studied in the work reviewed, only the overwinter trends of total free sugars and water-soluble protein nitrogen were consistently correlated with the overwinter trends of frost hardiness.

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