Abstract
WE have already investigated the changes in carbohydrate metabolism of the grape vine (Riparia portalis and Berlandieri × Riparia T 5 C) during dormancy in autumn and winter. A succession of periods of synthetic and hydrolytic processes was shown, and these produce starch from the sugar ⇌ starch interconversion. We showed that these periods may or may not depend on temperature changes in the environment. The least dependent period was held to be the accumulation of starch in autumn and then its hydrolysis in early winter. For the second period, the so-called low starch maximum, it has been found that its duration and degree of development are related to temperature changes, which may move the equilibrium of the enzyme processes toward the hydrolysis or the synthesis, respectively1,2.
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