Abstract Postharvest disease is a major problem in mangoes, affecting fruit quality, reducing shelf life and negatively impacting exports. To minimize the disease and maintain fruit quality, the effect of electron beam (E-beam) radiation on anthracnose disease, plant defense enzymes, and fruit quality was investigated. Mango fruit cv. Nam Dok Mai Si-Thong was exposed to an E-beam of 0.5 kGy and stored at 13 °C for 16 d. Non-exposed fruit served as the control. The E-beam treatment demonstrated reduction of disease incidence and severity by inducing the accumulation of hydrogen peroxide and the activities of plant defense enzymes such as peroxidase, β-1, 3-glucanase, and chitinase during late storage except for phenylalanine ammonia-lyase, and did not affect the accumulation of the total phenolic content. The respiration rate and ethylene production of the fruit increased immediately after, triggered by E-beam treatment. Later, the respiration rate was significantly suppressed compared to those fruit with non-treatment until the end of storage. The treatment significantly maintained fruit quality with regard to firmness, slowdown in decrease of titratable acid, and retardation in the increase of total soluble solids; however, it did not affect vitamin C content. This is a preliminary experiment to establish that E-beam can alleviate postharvest disease development via hydrogen peroxide and the activities of plant defense enzymes while maintaining fruit quality.

中文翻译：

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电子束辐射对收获芒果抗病性和品质的影响

摘要 芒果采后病害是一个主要问题，影响果实质量，缩短保质期并对出口产生负面影响。为了尽量减少病害并保持果实质量，研究了电子束（E-beam）辐射对炭疽病、植物防御酶和果实质量的影响。芒果果实 cv. Nam Dok Mai Si-Thong 暴露于 0.5 kGy 的电子束并在 13 °C 下储存 16 天。未暴露的水果作为对照。电子束处理证明通过诱导过氧化氢的积累和植物防御酶（如过氧化物酶、β-1、3-葡聚糖酶和几丁质酶）在后期储存期间（苯丙氨酸解氨酶除外）的活性降低了疾病的发生率和严重程度，且不影响总酚含量的积累。由电子束处理触发后，果实的呼吸速率和乙烯产量立即增加。后来，与未处理的那些水果相比，直到储存结束，呼吸率都被显着抑制。该处理显着保持了果实的硬度，减缓了可滴定酸的减少，延缓了总可溶性固形物的增加；然而，它并没有影响维生素 C 的含量。这是一项初步实验，旨在确定电子束可以通过过氧化氢和植物防御酶的活性缓解采后病害的发展，同时保持果实品质。与未经处理的水果相比，直到储存结束，呼吸率都被显着抑制。该处理显着保持了果实的硬度，减缓了可滴定酸的减少，延缓了总可溶性固形物的增加；然而，它并没有影响维生素 C 的含量。这是一项初步实验，旨在确定电子束可以通过过氧化氢和植物防御酶的活性缓解采后病害的发展，同时保持果实品质。与未经处理的水果相比，直到储存结束，呼吸率都被显着抑制。该处理显着保持了果实的硬度，减缓了可滴定酸的减少，延缓了总可溶性固形物的增加；然而，它并没有影响维生素 C 的含量。这是一项初步实验，旨在确定电子束可以通过过氧化氢和植物防御酶的活性缓解采后病害的发展，同时保持果实品质。