Diacylated flavonol glycosides are the response of Scots pine seedlings to UV-B irradiation. The two induced compounds 1 and 2 both have their absorption maximum at 315 nm (ϵ = 50300) in the range of UV-B radiation (290–320 nm), are compartmented in the epidermis, and offer much better protection than the monoacylated analogues at the same molarity.
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Jungblut et al. (1995) studied this question.
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