Abstract
Quantitative and qualitative changes in epicuticular flavonoid aglycones and cellular flavonoid glycosides have been investigated in leaves of flowering plants of Cistus laurifolius during ontogenetic and seasonal development. Accumulation of epicuticular flavonoids paralleled an increase in total secreted leaf exudate. Quercetin methyl ethers were identified as major components secreted throughout the year, but methylation patterns varied significantly depending on leaf age. Individual epicuticular flavonoid aglycones showed decomposition during leaf development, which could be simulated by application of UV light to flavonoid mixtures in vitro. Flavonoid glycosides increased dramatically during leaf development. Quercetin-3-galactoside was the predominant glycoside in young leaves, whereas myricetin-3-glycosides dominated in mature tissues. Phytotron-grown young seedlings reflected similar changes in flavonoid composition during ontogenetic development.
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