in flavedo. Beside invertase activities, we also have examined
changes in SS and SPS activities that take place in flavedo and
albedo of UVB-treated lemons (Fig. 4). SS and SPS, measured in
sucrose and sucrose 6-P direction, were, in general, higher in
flavedo than in albedo, but were differently affected by supplemental
UV-B radiation. The SS activity in UVB-treated flavedo
was strongly increased reaching at 1min time–dose a maximum
value of 0.047mol sucrose min−1 g−1 FW (4.9-fold higher than