In the present study, the dynamics of the biogenesis of the flavonoid compounds in haselworth such as isorhamnetin and quercetin glycosides and chalcone diglycoside, respectively, were investigated at various ontogenetic stages. The yield of transisoasarone and chlorophyll a and b were also analysed. The high concentration of transisoasarone was found in the rootstock (rhizome). Flavonoids were accumulated in the leaves; some chalcone diglycoside was found in the rhizome, too. The maximum concentration of flavonoid glycosides was detected in spring. In this period the young leaves are not protected either by cover leaves of buds or by the foliage of the uppermost zone of the vegetation. At this stage the a possible function of flavonoid glycosides could be the protection of the assimilation apparatus of young leaves against UV radiation.
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