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Anaerobic response of carnations to insecticidal controlled atmospheres.

Johnston, J. W.; Carpenter, A.; Lill, R. E.;

Postharvest Horticulture Series - Department of Pomology, University of California Year: 1997 Issue: No. 15 Pages: 114-122 Ref: 15 ref.

1997

บทคัดย่อ

Anaerobic response of carnations to insecticidal controlled atmospheres.

Cut carnation (cultivars Klemaxi and Doranja) flowers were held in (1) air, (2) 0.1% O2 (48 h), 60% CO2 (48 h), air, (3) 60% CO2 (48 h), 0.1% O2 (48 h), air, or (4) 60% CO2 + 0.1% O2 (48 h), air. Hypercarbic and anoxic controlled atmosphere (CA) storage accelerated pigment loss and petal wilting, and reduced flower longevity. Pigment loss, and the observed water-saturated appearance of the petals indicated a loss of membrane integrity, which may be responsible for the loss of quality in these CA treatments. The reduction in longevity was found to be ethylene independent, as only air-treated flowers exhibited the characteristic climacteric rise in ethylene production. Flowers treated with hypercarbic CA before anoxic CA showed the least loss in longevity, indicating hypercarbic CA preconditions the flowers to anoxia. Flower longevity was predicted by the ratio of ethanol production to acetaldehyde production. CA-treated flowers accumulated similar total amounts of acetaldehyde, but flowers with g

reater longevity converted more acetaldehyde to ethanol, thus delaying acetaldehyde accumulation. The results indicate that acetaldehyde may play a major role in damaging carnation flowers held in disinfestation CA conditions.