Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China.
Food Chem. 2021 May 15;344:128600. doi: 10.1016/j.foodchem.2020.128600. Epub 2020 Nov 11.
The contents of phenolic compounds, especially flavonoids, and antioxidant activity of rice (Oryza sativa, Os) and Chinese wild rice (Zizania latifolia, Zl) harvested in China were compared. Zl possessed significantly higher contents of total phenolics, flavonoids, and proanthocyanidins and exhibited higher antioxidant activity than in the Os Xian group, the Os Geng group, and red rice. The flavonoid contents of Os and Zl were compared using a UHPLC-QqQ-MS-based metabolomics approach. A total of 159 flavonoids were identified, among which 78 showed differential expression (72 up-regulated and six down-regulated in the Zl group). The Kyoto Encyclopaedia of Genes and Genomes annotation and classification indicated that the differentially expressed flavonoids were mainly related to anthocyanin biosynthesis. Moreover, candidate genes for flavonoid biosynthesis in Os and Zl were identified in this study. Compared with non-pigmented and red rice, Zl may be more nutritious and is thus considered a better source of natural antioxidants.
比较了中国收获的水稻（Oryza sativa，Os）和野生稻（Zizania latifolia，Zl）中酚类化合物，特别是类黄酮的含量和抗氧化活性。Zl 具有更高的总酚、类黄酮和原花青素含量，并表现出比 Os Xian 组、Os Geng 组和红米更高的抗氧化活性。使用基于 UHPLC-QqQ-MS 的代谢组学方法比较了 Os 和 Zl 的类黄酮含量。共鉴定出 159 种类黄酮，其中 78 种表现出差异表达（Zl 组中有 72 种上调，6 种下调）。京都基因与基因组百科全书注释和分类表明，差异表达的类黄酮主要与花青素生物合成有关。此外，本研究还鉴定了 Os 和 Zl 中类黄酮生物合成的候选基因。与非色素和红米相比，Zl 可能更有营养，因此被认为是更好的天然抗氧化剂来源。
