Irreversibility of chilling injury in zucchini squash (Cucurbita pepo L.) could be a programmed event long before the visible symptoms are evident

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• 作者：Balandrá ; n-Quintana ; René ; R. ; Mendoza-Wilson ; Ana Ma. ; Gardea-Bé ; jar ; Alfonso A. ; et. al.
• 关键词：Chilling injury ; Zucchini squash ; Cucurbita pepo L. ; Calorimetry ; Plant heat evolution ; Metabolic heat rates ; Cold signaling
• 刊名：Biochemical and Biophysical Research Communications
• 出版年：2003
• 出版时间：August 1, 2003
• 年：2003
• 卷：307
• 期：3
• 页码：553-557
• 全文大小：114 K

文摘

Zucchini fruits were subjected to 2.5 or 10°C for 16d, followed by transfer to 20°C for 24h in order to evaluate the relationship between ripening pattern, measured as CO₂ evolution and ethylene (C₂H₄) production, and metabolic heat production (q). Chilling injury (CI) visible symptoms were evident after 8d at 2.5°C, but none were recorded on fruits kept at 10°C. In fruits held at 10°C, q, C₂H₄ production, and CO₂ evolution diminished in the course of 16d, whereas in those at 2.5°C CO₂ evolution showed an early burst peaking at 8d. Both C₂H₄ production and q also showed a burst at 2.5°C but they started at 4 and 8d, respectively, and peaked at 12d. The results showed that irreversibility of chilling injury in zucchini could occur long before the appearance of visible symptoms, although the metabolic activity accompanying the irreversibility process was not noticeable by isothermal calorimetry.