BACKGROUND Climate change has caused an increase in the frequency and intensity of heatwaves, worldwide, which subject plants to thermal stress for short periods; this can affect the quality of melon fruits, both negatively and positively. Since the application of putrescine has been shown to help increase tolerance of abiotic stresses, the objective of this work is to determine the effects of the foliar application of putrescine (1.5 mM and 5 mM) before a short heat stress (HS) on the quality of melon fruits. RESULTS The results indicate that HS had a positive effect on the quality of melon fruits, since it increased the total sugars and polyamines contents and the antioxidant capacity, and reduced the presence of substances undesirable in foods such as nitrate. However, the fruit quality was further increased by the combination of HS and putrescine (5 mM). In this case, the melon fruits showed increases in their antioxidant capacity and contents of polyamines, amino acids and minerals beneficial to health. The nitrate concentration was even lower than in the control fruits. CONCLUSION This novel study highlights the possibility of improving the nutritional quality of melon pulp by applying foliar putrescine in combination with a short period of high temperature. This article is protected by copyright. All rights reserved.

中文翻译：

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在短期热应激前叶面喷施腐胺可提高甜瓜果实 (Cucumis melo L.) 的品质。

背景 气候变化已导致全球范围内热浪的频率和强度增加，使植物在短时间内受到热应激；这会对甜瓜果实的质量产生负面和正面的影响。由于已证明腐胺的施用有助于提高对非生物胁迫的耐受性，因此这项工作的目的是确定在短热胁迫 (HS) 前叶面施用腐胺 (1.5 mM 和 5 mM) 对质量的影响瓜果。结果 结果表明，HS 对甜瓜果实的品质有积极影响，因为它增加了总糖和多胺的含量和抗氧化能力，并减少了食物中不良物质如硝酸盐的存在。然而，HS 和腐胺 (5 mM) 的组合进一步提高了果实质量。在这种情况下，甜瓜果实的抗氧化能力和对健康有益的多胺、氨基酸和矿物质含量增加。硝酸盐浓度甚至低于对照水果。结论 这项新颖的研究强调了通过施用叶面腐胺并结合短期高温来提高甜瓜果肉营养质量的可能性。本文受版权保护。版权所有。结论 这项新颖的研究强调了通过施用叶面腐胺并结合短期高温来提高甜瓜果肉营养质量的可能性。本文受版权保护。版权所有。结论 这项新颖的研究强调了通过施用叶面腐胺并结合短期高温来提高甜瓜果肉营养质量的可能性。本文受版权保护。版权所有。