Pigments were monitored in parsley leaves stored in air, air + 10 ppm GH.,, or 10% O2 + 10% CO2 controlled atmosphere (CA). Chlorophylls a and b, as determined with HPLC, decreased sharply in leaves held in air or air + 10 ppm GH4. The decrease was less in leaves held in 10% O2 and 10% CO2 CA. The oxidized product of chlorophyll a, lo-hydroxychlorophyll a, did not accumulate and chlorophyllide ...