The lower UV susceptibility induced by both higher light intensity and higher amount of blue light, and characterized by the
photosynthetic performance,relies on specific acclimation processes that include pigments which contribute the photo chemical adaptation (Chl a, Chl b, Car)as well as pigments that serve as shielding compounds (e.g.epidermal flavonols). In the present study light intensity and light quality had different effects on leaf pigment compositions. While the photo chemical acclimation was particularly influenced by light quality ,the accumulation of flavonoids was affected by both light intensity and light quality. Control plants grown under 100 molm−2 s−1 had a17%higher con centration of Chl a + b and a15%higher concentration of Car than control plants grown under 300 molm−2 s−1 (Table 1)