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Differential responses of intact and minimally processed lettuce to high carbon dioxide atmospheres.

Mateos, M.; Ke, D.; Kader, A.; Cantwell, M.;

Acta Horticulturae Year: 1993 Issue: No. 343 Pages: 171-174 Ref: 4 ref.

1993

บทคัดย่อ

Differential responses of intact and minimally processed lettuce to high carbon dioxide atmospheres.

Intact heads and minimally processed midrib tissue and green tissue of Vanguard lettuce were kept in air or in air + 5, 10 or 20% CO2 for 10 or 20 days at 2.5 deg C and then transferred to air at 20 deg for 12 h. Samples were observed for development of heart leaf injury, brown stain and senescent browning. All the CO2 treatments caused severe injury in intact heads, with heart leaf injury as the major symptom. For minimally processed lettuce, senescent browning was severe in air-stored tissue. Elevated CO2 atmospheres prevented or reduced this disorder. No brown stain was observed in processed green leaf tissue treated with 5 or 10% CO2. However, brown stain occurred in the processed green tissue exposed to 20% CO2 and in intact heads and processed midrib tissue exposed to 5, 10 or 20% CO2, with the midrib tissue affected the most. Off-flavour developed in the intact heads exposed to 20% CO2. The physiological bases for these differential responses are discussed.