Effect of ethylene, intermittent warming and controlled atmosphere on postharvest quality and the occurrence of woolliness in peach (Prunus persica cv. Chiripa) during cold storage
Effect of ethylene, intermittent warming and controlled atmosphere on postharvest quality and the occurrence of woolliness in peach (Prunus persica cv. Chiripa) during cold storage
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DOI：
10.1016/j.postharvbio.2005.05.007
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发表时间：
2005-10-01
影响因子：
7
通讯作者：
Rombaldi, CV
中科院分区：
文献类型：
--
作者：
Girardi, CL;Corrent, AR;Rombaldi, CV
桃子（Prunus persica）收获后品质的下降与代谢变化、机械损伤、果肉硬度丧失、生理紊乱和腐烂有关。在“Chiripa”品种中，羊毛化是影响采后品质的主要生理过程。为了更好地了解“Chiripa”桃毛状的发展并确定可以防止毛状发生的条件，我们设计了几种采后处理，包括单独冷藏 (CS) 或与乙烯或 1-甲基环丙烯 (1-MCP) 的应用相结合、间歇性升温或气调 (CA) 储藏。我们评估了这些处理对采后保存、羊毛状发生以及内聚半乳糖醛酸酶 (endo-PG)、外聚半乳糖醛酸酶 (exo-PG) 和果胶甲酯酶 (PME) 活性的影响。我们的结果表明，这些处理可以改变三种酶的活性，并且内切-PG和外切-PG活性的诱导和/或PME活性的抑制减少了羊毛性的发生。单独的CS对endo-PG和exo-PG活性有主要影响，但对PME活性影响较小。 1-MCP的应用加剧了这种差异。无论是应用乙烯还是间歇性升温，都会增加内切-PG 和外切-PG 活性，但不会降低 PME 活性，导致纸浆硬度损失和腐烂。在CA储存下，PME活性有效降低，处理期间较低的endo-PG和exo-PG活性在处理结束5天后急剧增加。仅在CA储存下，桃子的整体品质得到了更好的保存。通过这种处理，PG 和 PME 活性之间的差异缩小，并且两个酶组的活性均下降。结果，纸浆的硬度得到了更好的保留，腐烂和羊毛的发生率降低了。 (c) 2005 Elsevier B.V. 保留所有权利。
The loss of quality in peach (Prunus persica) after harvest is associated with metabolic changes, mechanical damage, loss of pulp firmness, physiological disorders and decay. In the 'Chiripa' cultivar, woolliness is a major physiological process that affects the postharvest quality. For a better understanding of the development of woolliness in 'Chiripa' peach and to identify conditions that can prevent it, we devised several postharvest treatments consisting of cold storage (CS) either alone or in combination with the application of ethylene or 1-methycyclopropene (1-MCP), intermittent warming or controlled atmosphere (CA) storage. We evaluated the effects of these treatments on postharvest preservation, the occurrence of woolliness and the activities of endo-polygalacturonase (endo-PG), exo-polygalacturonase (exo-PG) and pectin methylesterase (PME). Our results indicated that these treatments could modify the activities of the three enzymes, and that the induction of endo-PG and exo-PG activity and/or the repression of PME activity reduced the occurrence of woolliness. CS alone had a major effect on endo-PG and exo-PG activity but less impact on PME activity. The application of 1-MCP exacerbated this difference. Either ethylene application or intermittent warming increased endo-PG and exo-PG activities without reducing PME activity, resulting in the loss of pulp firmness and decay. Under CA storage, PME activity was effectively reduced and the activities of endo-PG and exo-PG, which were low during the treatment, dramatically increased 5 days after the end of the treatment. The overall quality of the peaches was better preserved under CA storage alone. With this treatment, the difference between PG and PME activity narrowed and the activity of both enzymatic groups decreased. As a result, the firmness of the pulp was better preserved and the incidence of decay and woolliness decreased. (c) 2005 Elsevier B.V. All rights reserved.