College of Horticulture, Sichuan Agricultural University, Chengdu 611130, China.
Institute of Plant Protection, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China.
Food Chem. 2021 Sep 15;356:129713. doi: 10.1016/j.foodchem.2021.129713. Epub 2021 Mar 27.
In this study, we investigated the effects of melatonin application on berry coloration, sugar accumulation, and nutrient absorption in 'Summer Black' grapes. Melatonin spraying at 100 μmol L on grapes during veraison induced skin coloration earlier than that in controls, as well as higher transcript abundance of anthocyanin biosynthesis-related genes and transcription factors MYBA1 and MYBA2. Melatonin treatment increased the soluble sugar content, especially of sucrose, by promoting the activity of sucrose phosphate synthase, and also increased endogenous melatonin content and the concentrations of mineral nutrients N, K, Cu, Fe, and Zn in grape berries. Correlation analysis suggested that high sugar content promoted anthocyanin synthesis. These findings provide a sound theoretical basis for the development of techniques aimed to achieve optimum coloration of grapes in hot and rainy regions.
在这项研究中，我们调查了褪黑素应用对“夏日黑”葡萄浆果着色、糖积累和营养吸收的影响。在转色期以 100μmol/L 的浓度向葡萄喷施褪黑素，比对照更早地诱导了果皮着色，同时也提高了与花青素生物合成相关的基因和转录因子 MYBA1 和 MYBA2 的转录丰度。褪黑素处理通过促进蔗糖磷酸合酶的活性，增加了可溶糖含量，特别是蔗糖的含量，还增加了内源褪黑素含量和葡萄浆果中氮、钾、铜、铁和锌等矿质营养元素的浓度。相关性分析表明，高糖含量促进了花青素的合成。这些发现为开发旨在实现炎热多雨地区葡萄最佳着色的技术提供了可靠的理论基础。
