Flavonols were similarly induced by UVA and UVB radiation in Arbutus unedo leaves.
UVB was more efficient than UVA in inducing flavonol synthesis in Vitis vinifera.
From no UV to radiation with the whole solar spectrum flavonols increased more in Vitis vinifera than in Arbutus unedo.
In Vitis vinifera the I-P phase was higher in leaves developed in fully solar radiation.
UV induces damage of the oxygen evolving complex in Vitis vinifera but not in Arbutus unedo.