Comparative Analysis of the Metabolites in Two Varieties of Pu-erh Tea
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Abstract:
In this research, metabolomic techniques and tools were used to analyze two excellent varieties of Yunnan Pu-erh tea obtained through population breeding. The results showed that: A total of 798 metabolites were detected and quantified in cultivar 1 (Taoxingye), and 802 metabolites were detected and quantified in cultivar 3 (Yungui). There were 202 metabolites (SCMs) with significant changes between the two cultivars. The abundance of 108 SCMs in cultivar 1 (Taoxingye) was significantly lower than that in cultivar 3 (Yungui), with 94 increasing significantly. According to their quantities, these SCMS can usually be divided into flavonoids, phenolic acids, lipids, amino acids and their derivatives, lignans and coumarins, organic acids, alkaloids, nucleotides and their derivatives, tannins and other classes. In addition, differential metabolites were enriched in 49 KEGG pathways, and most of the identified differential metabolites exist in phenylpropanoid biosynthesis, phenylalanine metabolism, flavonoid biosynthesis (including flavone biosynthesis and flavonol biosynthesis), amino acid biosynthesis and other metabolic pathways. The results of these significantly different metabolites can be used to provide a theoretical basis and scientific guidance for monitoring tea adaptability and quality control of cultivar 1(Taoxingye) and cultivar 3(Yungui).
