Fig. 2.

Fluorescence emission spectra of horizontal cross-sections of the epidermis (A) and the mesophyll (B) of Ligustrum vulgare leaves exposed to 20 % (blue lines) or 100 % solar radiation (red lines). Cross-sections (100 µm thick) were stained with 0·1 % (w/v) 2-amino ethyl diphenyl boric acid in phosphate buffer (NR) and excited at 365 ± 5 nm. Spectra have been normalized to fluorescence intensity at 570 nm of adaxial epidermis (A) or palisade tissue (B) of sun leaves, respectively.