Wavelength-selective absorption of solar radiation within plant leaves allows penetration of visible radiation to the chloroplats, while removing much of the damaging ultraviolet-B radiation. Flavonoids are important in this wavelength-selective absorption. Induction of flavonoid synthesis by solar radiation, and specifically by UV-B radiation, is discussed as this relates to the potential acclimation of plants to enhanced solar UV-B radiation that would result from stratospheric ozone reduction.
Caldwell, M., Robberecht, R. and Flint, S. (1983). Internal filters: Prospects for UV-acclimation in higher plants. Physiol. Plant. 58(3): 445-450.