始熟期前后果实辐照UV-B对'玫瑰香'葡萄品质的影响OA

To investigate the effects of UV-B radiation treatment on grape berries before and after veraison under the same conditions,this study used'Muscat Hamburg'grapes as experimental material and applied UV-B supplementation treatments 10 days before veraison(T1)and 10 days after veraison(T2).The results showed that both UV-B treatments effectively promoted the accumulation of anthocyanins in the berry peel and slowed the decomposition of aldehydes.However,they significantly increased the titratable acid content of grape berries and remarkably decreased the solid-acid ratio,whereas the contents of most monoterpenes and alcohols were significantly reduced.Compared with the pre-veraison treatment,the post-veraison UV-B treatment exerted a more pronounced effect on the accumulation of anthocyanins and aroma substances.The anthocyanin accumulation in the T2 group was more rapid,with its anthocyanin content reaching 2.14 times that of the CK group and 2.08 times that of the T1 group at 84 days after flowering.At maturity,the T2 group had the lowest monoterpene content.Furthermore,the UV-B treatments differently affected various components of anthocyanins and aroma substances.For instance,T1 treatment facilitated the accumulation of Cyanidin-3-O-glucoside,while the T2 treatment exhibited a prominent advantage in promoting the accumulation of monomers such as Peonidin-3-O-glucoside;treatment T1 resulted in the greatest reduction in alcohols,while treatment T2 led to a more pronounced decrease in monoterpenes.Based on the experimental results,it is recommended to prioritize the application of post-veraison UV-B treatment when formulating cultivation techniques with the core objective of optimizing berry coloration in grape production.