Seasonal changes in contents of phenolic compounds and sugar inRhus, Euonymus andAcer leaves with special reference to anthocyanin formation in autumn
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Seasonal variation in sugar, total phenol and flavanol contents was examined inRhus, Euonymus andAcer leaves. In all plant leaves, the total phenol and flavanol content per leaf increased rapidly at the early growth stages but thereafter the content was kept rather constant. Later on, sugar content increased to a high level, and the autumnal reddening began. An excessive accumulation of sugar just before the reddening indicated that the accumulation related to the anthocyanin formation. The incorporation of radioactivity into anthocyanin in autumn leaves from glucose-[U-14C] and phenylalanine-[U-14C] was also observed.
KeywordsTotal Phenol Flavanol Reduce Sugar Content Autumn Leaf Anthocyanin Formation
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