Abstract
Summary The flavonol aglycones excreted by Aesculus hippocastanum buds are found in great quantities in the glandular hairs and in much smaller concentrations in the parenchyme, while coumarins are specially abundant in the parenchyme. In Spring and in Automn an enzymatic activity, the first step of which is the deamination of phenylalanine, is detected in the hairs; at other periods the parenchyme is characterized by a PAL activity. The correlations between these different enzyme activities and the accumulation of aromatic compounds in the tissues (flavonol secretion and coumarins) are analysed at different stages of the annual secretion cycle. The function of the different tissues is discussed.
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