中国农业科学 ›› 2026, Vol. 59 ›› Issue (7): 1536-1551.doi: 10.3864/j.issn.0578-1752.2026.07.012

• 园艺 • 上一篇    下一篇

2, 4-表油菜素内酯对苹果果实采后贮藏性能的影响

苏一帆1(), 杨瞻旭1, 王迪2, 冒俊呈1, 魏萌萌1, 陈泽3, 白欣冉3, 楚天歌3, 马昌宁1, 乔明菲1, 孙权1,4,5,*(), 胡大刚1,*()   

  1. 1 山东农业大学园艺科学与工程学院/国家苹果工程技术研究中心/农业农村部黄淮地区园艺作物生物学与种质创制重点实验室/山东省果蔬种质创新与利用重点实验室, 山东泰安 271018
    2 平邑县检验检测中心, 山东平邑 273300
    3 山东农业大学未来技术学院, 山东泰安 271018
    4 华中农业大学果蔬园艺作物种质创新与利用全国重点实验室, 武汉 430070
    5 湖北洪山实验室, 武汉 430070
  • 收稿日期:2025-09-03 接受日期:2025-10-20 出版日期:2026-04-08 发布日期:2026-04-08
  • 通信作者:
    孙权,E-mail:
    胡大刚,E-mail:
  • 联系方式: 苏一帆,E-mail:1218075188@qq.com。
  • 基金资助:
    国家自然科学基金(32572986); 国家自然科学基金(32302616); 泰山学者特聘专家项目(tstp20250723); 山东省重点研发计划(重大科技创新工程)(2023CXGC010709); 山东省自然科学基金(ZR2023QC032); 山东省青年科技人才托举工程(SDAST2024QTA025)

Effects of 2, 4-Epibrassinolide on Postharvest Storage Quality and Physiological Performance of Apple

SU YiFan1(), YANG ZhanXu1, WANG Di2, MAO JunCheng1, WEI MengMeng1, CHEN Ze3, BAI XinRan3, CHU TianGe3, MA ChangNing1, QIAO MingFei1, SUN Quan1,4,5,*(), HU DaGang1,*()   

  1. 1 College of Horticultural Science and Engineering, Shandong Agricultural University/National Engineering Research Center for Apple/Key Laboratory of Biology and Germplasm Creation of Horticultural Crops in Huang-Huai Region, Ministry of Agriculture and Rural Affairs/Shandong Provincial Key Laboratory of Fruit and Vegetable Germplasm Innovation and Utilization, Taian 271018, Shandong
    2 Pingyi County Inspection and Testing Center, Pingyi 273300, Shandong
    3 College of Future Technologies at Shandong Agricultural University, Taian 271018, Shandong
    4 National Key Laboratory of Germplasm Innovation and Utilization for Horticultural Crops, Huazhong Agricultural University, Wuhan 430070
    5 Hongshan Laboratory, Hubei, Wuhan 430070
  • Received:2025-09-03 Accepted:2025-10-20 Published:2026-04-08 Online:2026-04-08

摘要:

【目的】本研究旨在系统探究2, 4-表油菜素内酯(2, 4-epibrassinolide,EBR)对苹果果实采后贮藏性能的调控作用,明确其在延缓果实软化、维持风味品质及增强抗氧化能力方面的生理与分子机制,为开发新型植物源保鲜剂提供理论依据和技术支持。【方法】以‘鲁丽’苹果为试验材料,采用外源施用3 μmol·L-1 EBR溶液浸泡处理2 h,以蒸馏水处理为对照。果实处理后于室温条件下贮藏20 d,分别于第0、3、5和10天取样,测定果实硬度、脆性、果肉均质度等质地指标,乙烯释放速率,内源BR含量,BR信号通路关键基因MdBZR1及乙烯合成关键基因MdACS1、MdACO1的表达水平。同时,分析细胞壁组分(纤维素、原果胶、可溶性果胶)含量及其降解酶(α-Gal、β-Gal、PG、PME、β-GC等)活性变化,评估淀粉、可溶性糖(葡萄糖、果糖、蔗糖)、有机酸(苹果酸、柠檬酸)等风味物质的动态积累,并检测抗氧化酶(SOD、POD、CAT、APX)活性、活性氧($\mathrm{O}_2^{\bar{.}}$、H2O2)水平以及抗逆物质(脯氨酸、可溶性蛋白、总酚、类黄酮)和丙二醛(MDA)含量。【结果】EBR处理显著延缓了苹果果实的软化进程,处理组果实的硬度、脆性和果肉均质度下降幅度分别比对照组降低2.88%、7.43%和4.63%。乙烯释放速率在贮藏中后期显著被抑制,第5天和第10天分别比对照组低37.11%和19.35%,同时乙烯合成关键基因MdACO1和MdACS1的表达显著下调。EBR处理促进内源BR积累,贮藏第10天时处理组BR含量较对照组高22.17%,并显著上调MdBZR1表达。细胞壁降解相关酶活性普遍被抑制,纤维素和原果胶降解分别减缓29.57%和16.32%,可溶性果胶积累降低53.00%。风味物质方面,EBR处理显著提高了可溶性糖(葡萄糖、果糖、蔗糖)和有机酸(苹果酸、柠檬酸)的含量,增强了果实的甜酸风味和营养品质。此外,EBR处理显著提升SOD、POD、CAT、APX等抗氧化酶活性,降低$\mathrm{O}_2^{\bar{.}}$和H2O2水平,减少MDA积累,同时提高脯氨酸、可溶性蛋白、总酚和类黄酮等抗逆物质的含量,综合增强了果实的抗氧化和抗衰老能力。【结论】EBR处理可通过激活BR信号通路、抑制乙烯合成、延缓细胞壁降解等细胞壁代谢活动、调控糖酸代谢平衡和增强抗氧化防御系统等多途径协同作用,显著改善苹果果实的采后贮藏性能和商品货架期。研究结果揭示了EBR在果实保鲜中的多重生理功能,也为基于植物激素的绿色保鲜技术开发提供了重要的理论支持和实践指导。

关键词: 苹果, 2, 4-表油菜素内酯, 采后, 贮藏性能, 保鲜, 细胞壁代谢

Abstract:

【Objective】This study systematically investigated the regulatory effects of 2, 4-epibrassinolide (EBR) on the postharvest storage quality of apple fruit. The physiological and molecular mechanisms of EBR delaying fruit softening, maintaining flavor quality, and enhancing antioxidant capacity were elucidated so as to offer a theoretical foundation and technical insight for developing novel plant-derived preservatives. 【Method】Using Luli apples as experimental material, fruits were treated by immersion in 3 μmol·L-1 EBR solution for 2 hours, with a distilled water group serving as the control. After treatment, fruits were stored at room temperature for 20 days. Samples were collected at 0, 3, 5, and 10 days to assess textural properties (firmness, brittleness, and flesh homogeneity), ethylene production rate, endogenous BR levels, and the expression of key BR signaling gene MdBZR1, as well as ethylene biosynthesis genes MdACS1 and MdACO1. Changes in cell wall composition (cellulose, protopectin, and soluble pectin) and the activities of related degrading enzymes (α-Gal, β-Gal, PG, PME, and β-GC) were analyzed. The dynamics of flavor compounds were evaluated, including starch, soluble sugars (glucose, fructose, and sucrose) and organic acids (malic acid, and citric acid). Additionally, the activities of antioxidant enzymes (SOD, POD, CAT, and APX), levels of reactive oxygen species ($\mathrm{O}_2^{\bar{.}}$ and H2O2), content of stress-related metabolites (proline, soluble protein, total phenols, and flavonoids), and malondialdehyde (MDA) accumulation were measured.【Result】EBR treatment significantly delayed apple fruit softening. Reductions in firmness, brittleness, and flesh homogeneity in the EBR group were 2.88%, 7.43%, and 4.63% lower than those in the control, respectively. Ethylene production was significantly suppressed during mid-to-late storage, with rates 37.11% and 19.35% lower than the control on days 5 and 10, respectively. Expression of ethylene synthesis-related genes MdACO1 and MdACS1 was notably downregulated. EBR treatment promoted endogenous BR accumulation, resulting in 22.17% higher than the control on day 10, and significantly upregulated MdBZR1 expression. Activities of cell wall-degrading enzymes were generally suppressed, and degradation of cellulose and protopectin was delayed by 29.57% and 16.32%, respectively, while soluble pectin accumulation was reduced by 53.00%. In terms of flavor, EBR treatment significantly increased the content of soluble sugars (glucose, fructose, and sucrose) and organic acids (malic acid, and citric acid), enhancing the fruit’s sweet-sour taste and nutritional quality. Moreover, EBR significantly boosted the activities of SOD, POD, CAT, and APX, reduced $\mathrm{O}_2^{\bar{.}}$ and H2O2 levels, lowered MDA accumulation, and increased the contents of proline, soluble protein, total phenols, and flavonoids, collectively improving the fruit’s antioxidant capacity and delaying senescence.【Conclusion】EBR treatment significantly improves the postharvest storage performance and marketable shelf life of apple fruit. This improvement is achieved through the synergistic action of multiple coordinated pathways, which include activating the BR signaling pathway, suppressing ethylene biosynthesis, retarding cell wall degradation and associated metabolic activities, regulating the balance of sugar and acid metabolism, and enhancing the antioxidant defense system. This study not only revealed the multifaceted physiological roles of EBR in fruit preservation but also provided important theoretical and practical support for the development of hormone-based green preservation technologies.

Key words: apple, 2, 4-epibrassinolide, postharvest, storage performance, preservation, cell wall metabolism