Abstract
Leaf tissues of crisphead lettuce (Lactuca sativa L.) were kept in air or in air enriched with 5% to 20% CO at OC for 2 to 9 days followed by transfer to air or to CO2 2enhanced atmospheres at 20C for 1 day to study the mode of CO2 action on metabolism of organic and amino acids. The 20% <ch> treatment caused a decrease in intracellular pH, which alone or, in combination with, other CO2 effects, inhibited succinate dehydrogenase but activated glutamate decarboxylase. This resulted in an accumulation of succinate and γ-aminobutyrate and a reduction in concentrations of malate and glutamate. Elevated CO2 atmospheres did not affect other organic and amino acids. These effects of CO2 were influenced by temperature and concentration/duration of exposure to CO2, while type of tissue (green vs. white) and cultivars of lettuce generally had no influence.
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