Isoenzyme analysis of Acer pseudoplatanus and Acer campestre leaves re
vealed the presence of one form of iron superoxide dismutase (FeSOD).
FeSOD was also found in the green line of Acer pseudoplatanus callus,
but not in the white line (without chloroplasts). It seems that the ex
pression of this metalloenzyme is a characteristic of photosynthetic c
ompetent tissue.