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Carbon dioxide action on metabolism of organic and amino acids in crisphead lettuce.

Ke, D.; Mateos, M.; Siriphanich, J.; Li, C.; Kader, A. A.;

Postharvest Biology and Technology Year: 1993 Vol: 3 Issue: 3 Pages: 235-247 Ref: 26 ref.

1993

บทคัดย่อ

Carbon dioxide action on metabolism of organic and amino acids in crisphead lettuce.

Tissue of crisphead lettuce (cultivars Climax, Salinas and/or Winter Haven) was kept in air or air enriched with 5% to 20% CO2 at 0 deg C for 2-9 days followed by transfer to air or the CO2-enriched atmosphere at 20 deg for one day to study the mode of CO2 action on metabolism of organic and amino acids. Exposure to 20% CO2 reduced the extractable activity of succinate dehydrogenase. The 20% CO2 treatment caused a decrease in pH, which partially inhibited the catalytic activity of succinate dehydrogenase and substantially activated glutamate decarboxylase. As a result, succinate and gamma -aminobutyrate accumulated and concentrations of malate and glutamate decreased. Such effects on the organic and amino acids were more pronounced with higher temperature, higher CO2 concentrations and longer exposure to CO2. The accumulation of succinate and gamma -aminobutyrate was induced by 15% or 20% CO2 in all the cultivars tested and in both green and white tissues of lettuce, regardless of variation in t

heir susceptibilities to CO2 injury.