Quality changes in lettuce heads stored in a controlled atmosphere. II. Phenolic metabolism and ethylene evolution
Maria Leja, Anna Mareczek, Stanisław Rożek
Department of Plant Physiology
Faculty of Horticulture, Agricultural University
29 Listopada 54, 31-425 Kraków, Poland
Three weeks of storage of two cultivars of ground lettuce in a controlled
atmosphere (CA) at 1°C (3% CO2 : 5% O2
and 10% CO2 : 11% O2)
followed by its 24 hr exposure to air (5°C) caused a considerable
increase in total phenols and activity of polyphenoloxidase and peroxidase. The ascorbic acid content
fell drastically by 90% of its initial value, irrespective of the gas composition of CA. A high initial
level of endogenous ethylene was reduced significantly after storage in CA, except for the cultivar Prado
treated with 10% CO2 : 11% O2. A controlled
atmosphere with 10% CO2 : 11% O2
caused a slight incraese in cell membrane permeability.
Low temperature seemed to be the main factor inducing metabolic changes although, in the case of
peroxidase activity, ethylene evolution and cell membrane permeability the
gas composition of CA also had a significant effect.
Leja M., Mareczek A., Rożek S., 1996. Quality changes in lettuce heads stored in a
controlled atmosphere. II. Phenolic metabolism and ethylene production.
Folia Horticulturae 8/2: 83-93.