addition,the difference in the climate between Germany and South
Africa might have affected the biochemical composition of the fruit
photosystems and influenced their response to stress. However,
while the Fv/Fm of mature ‘Gala’, ‘Gold Rush’ and ‘Granny Smith’
apple fruits was unaffected by an UV-B (0.012 kJ m−2 s−1 for 10 h)
treatment, it was decreased in ‘Braeburn’ fruits (Glenn et al., 2008).
The effect of UV-B on fruit fluorescence parameters is variable, and
can be influenced by a number of factors such as climatic adaptation,
fruit maturity and cultivar (Glenn et al., 2008).