UV-C is a no residual environmentally friendly physical treatment that could activate the fruit defense system and induce resistance to control the postharvest disease. Herein, the study was performed to investigate the effect of UV-C on disease occurrence, antioxidant system, disease-resistant defense enzymes, and phenylpropane metabolic pathway, and anthocyanin biosynthesis in nectarine fruit inoculated with Rhizopus stolonifer. Compared with the fruit without treatment, the results showed 3 kJ m⁻² UV-C treatment decreased lesion diameter as well as disease index. UV-C treatment increased the activities of antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), and ascorbate peroxidase (APX) and the contents of ascorbic acid (ASA) as well as glutathione (GSH). UV-C treatment activated the phenylpropane metabolic pathway and anthocyanin biosynthesis, thereby increasing the content of phenolic compounds, total flavonoids, anthocyanins, and lignin. Besides, UV-C treatment also promoted the activities of chitinase (CHI) and β-1,3-glucanase (GLU). These data demonstrated that UV-C treatment could promote the antioxidant system, stimulate phenylpropane metabolic pathway and anthocyanin biosynthesis, thus alleviate disease severity in R. stolonifer-inoculated nectarine during storage. This work concluded that UV-C was an eco-friendly treatment to control disease occurrence of postharvest nectarine fruit.

UV-C是一种无残留的环保物理处理方法，可以激活水果防御系统并诱导抗性以控制采后病害。在此，本研究旨在研究 UV-C 对接种根茎根霉的油桃果实的病害发生、抗氧化系统、抗病防御酶、苯丙烷代谢途径和花青素生物合成的影响。与未经处理的果实相比，结果显示 3 kJ m ^-2UV-C 治疗降低了病灶直径和疾病指数。UV-C 处理增加了抗氧化酶的活性，包括超氧化物歧化酶 (SOD)、过氧化氢酶 (CAT) 和抗坏血酸过氧化物酶 (APX) 以及抗坏血酸 (ASA) 和谷胱甘肽 (GSH) 的含量。UV-C处理激活了苯丙烷代谢途径和花色苷生物合成，从而增加了酚类化合物、总黄酮、花色苷和木质素的含量。此外，UV-C处理还促进了几丁质酶（CHI）和β-1,3-葡聚糖酶（GLU）的活性。这些数据表明UV-C处理可以促进抗氧化系统，刺激苯丙烷代谢途径和花青素生物合成，从而减轻R. stolonifer的疾病严重程度- 储存期间接种的油桃。这项工作的结论是，UV-C 是一种控制采后油桃果实病害发生的环保处理方法。