Ultraviolet (UV) influences postharvest changes in secondary metabolites of fruit. In this study, sweet cherries were treated with UV-C irradiation (1.05, 2.10, and 4.20 kJ/m²) for different treatment periods, they were stored at room temperature (25.0 ± 2.0 ℃) for 6 days. The results showed that the total phenolics, flavonoids, and anthocyanins increased in response to UV-C during storage. UPLC-ESI-MS analysis indicated that the individual flavonoids and anthocyanins contents increased, including cyanidin 3-O-galactoside, cyanidin O-syringic acid, cyanidin 3-O-glucoside, pelargonidin 3-O-glucoside, tricin 5-O-hexoside, luteolin C-hexoside, Di-O-methylquercetin, and naringenin-7-O-glucoside. Furthermore, UV-C (2.10 kJ/m²) treatment upregulated the enzymes activity and genes expression of phenylpropanoid pathway. Highly significant correlations were found among flavonoids, anthocyanins, phenylalanine ammonia lyase (PAL) and genes expression of ANS, DFR, UFGT (r > 0.6, p < 0.01) and cinnamate 4-hydroxylase (C4H) and PAL, C4H, 4CL, CHI, ANS, DFR expressions (r> 0.6, p < 0.01). These results contribute to illustrating the molecular mechanism of flavonoids and anthocyanins biosynthesis under the UV-C irradiation in sweet cherries and promote the development of postharvest in agriculture.

紫外线（UV）影响水果次生代谢产物的采后变化。在这项研究中，将甜樱桃分别用UV-C辐照（1.05、2.10和4.20 kJ / m ²）处理不同的处理时间，并将其在室温（25.0±2.0℃）下保存6天。结果表明，在储存过程中，总酚，类黄酮和花色苷随UV-C的增加而增加。UPLC-ESI-MS分析表明，单独的类黄酮和花色苷含量增加，包括花青素3- O-半乳糖苷，花青素O-丁香酸，花青素3- O-葡糖苷，pelargonidin 3- O-葡糖苷，tricin 5- O-己糖苷，木犀草素C-己糖苷，Di-O-甲基槲皮素和柚皮素-7- O-葡萄糖苷。此外，UV-C（2.10 kJ / m ²）处理上调了苯丙烷途径的酶活性和基因表达。黄酮，花色苷，苯丙氨酸氨裂合酶（PAL）与ANS，DFR，UFGT（r> 0.6，p <0.01）和肉桂酸4-羟化酶（C4H）和PAL，C4H，4CL，CHI的基因表达之间存在高度相关性，ANS，DFR表达式（r > 0.6，p<0.01）。这些结果有助于阐明甜樱桃中UV-C照射下黄酮类化合物和花色苷生物合成的分子机理，并促进了农业采后的发展。