Skin Care and Beauty

Interestingly, plant species generally acclimate to UVB exposure. These acclimations include the increased biosynthesis of UVB screening phytochemicals such as vitamin E and flavonoids with antioxidant properties. Brassica napus L. plants acclimate to environmentally relevant increases in 

UVB through the accumulation of specific flavonoids in the leaf epidermis. However, B. napus was found to lose other flavonoids upon exposure to UVA and UVB. The levels of all the extractable flavonoids in the leaves of B. napus plants are decreased in a dose-dependent manner upon exposure to UVA. UVA preexposures were found to reduce the accumulation of some flavonoids induced by UVB. This down regulation was particularly confirmed for quercetin-3-O-sophoroside and quercetin-3-0-sophoroside-7-O-glucoside. This is interesting, because these two quercetins might be induced by the UVB and correlated with the UVB tolerance in some plant species. From the photobiological nature of the UVA-mediated accumulation of flavonoid, complex interactions between the UVA and UVB responses are suggested [66]. 

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