Abstract ‘Honeycrisp’ is a popular apple variety among consumers due to its desirable flavour and characteristic texture. However, this variety is highly prone to pre-harvest fruit drop, bitter pit and decline in quality during long-term storage. This research investigated the effects of hexanal as a formulation (named by us as Enhanced Freshness Formulation -EFF) on fruit retention and post-harvest shelf-life in ‘Honeycrisp’ apples. Hexanal is a known inhibitor of phospholipase D (PLD). Our results indicated that hexanal application reduced PLD enzyme activity from 30 days post-harvest to the end of the storage period compared to the other treatments. Ethylene production was reduced with hexanal treatment from 0 to 90 days post-harvest. An increase in total soluble solids and a decrease in physiological loss in weight was observed with hexanal application. A significantly lower occurrence of progression and severity of bitter pit was observed, while incidence of bitter was reduced by 70 %. Further electron micrographs revealed that hexanal treated apples had higher structural integrity overall. Our results reveal that application of hexanal can reduce bitter pit incidence in Honeycrisp apples, while increasing the post-harvets storage.

中文翻译：

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收获前己醛喷雾减少苦核并提高“蜜脆”苹果（Malusdomestica Borkh）的收获后质量

摘要 'Honeycrisp' 是一种深受消费者欢迎的苹果品种，因为它具有令人满意的风味和独特的质地。然而，该品种在长期储存过程中极易出现采前落果、苦核和品质下降。本研究调查了己醛作为一种配方（我们将其命名为增强新鲜度配方 -EFF）对“蜜脆”苹果的果实保留时间和收获后保质期的影响。己醛是已知的磷脂酶 D (PLD) 抑制剂。我们的结果表明，与其他处理相比，从收获后 30 天到储存期结束，应用己醛降低了 PLD 酶活性。从收获后的 0 到 90 天，通过己醛处理降低了乙烯产量。使用己醛可观察到总可溶性固形物的增加和体重生理损失的减少。观察到苦坑的进展和严重程度显着降低，而苦味的发生率降低了 70%。进一步的电子显微照片显示，经过己醛处理的苹果总体上具有更高的结构完整性。我们的结果表明，使用己醛可以降低蜜脆苹果的苦核发生率，同时增加收获后的储存量。