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Journal of Tea Science ›› 2023, Vol. 43 ›› Issue (6): 806-822.doi: 10.13305/j.cnki.jts.2023.06.005

• Research Paper • Previous Articles     Next Articles

Study on the Influence of Tea Green Leafhopper Infestation on the Tenderness of Fresh Tea Leaves and the Extraction Rate of Metabolites Related to Oolong Tea Quality

WU Shuhua1,2,3,4, MAO Kaiquan1,3,4, CHEN Jiaming1,3,4, LI Jianlong2, XUE Jinghua1,4, ZENG Lanting1,3,4, YANG Yuhua1,4, GU Dachuan1,3,4,*   

  1. 1. Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;
    2. Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation and Utilization, Tea Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. South China National Botanical Garden, Guangzhou 510650, China
  • Received:2023-08-30 Revised:2023-10-30 Online:2023-12-15 Published:2024-01-08

Abstract: Tea green leafhopper is a major insect widely distributed in tea gardens, which has a significant impact on the yield and quality of tea. However, the effects of tea green leafhopper infestation on the tenderness of fresh tea leaves and the extraction rate of metabolites related to oolong tea quality remain unclear. By means of shear force measurement, broken tea rate analysis, oolong tea brewing, metabolite analysis and correlation analysis, it was found that the infestation of tea green leafhoppers significantly increased the contents of cell wall materials lignin, cellulose and pectin, and decreased the tenderness of fresh tea leaves and broken tea rate. The extraction rates of tea polyphenols, free amino acids, soluble sugars, catechin monomers, amino acid monomers and theanine were affected. Moreover, except for epicatechin gallate (ECG), the extraction of these taste substances and the tenderness of fresh tea leaves were significantly correlated with the contents of cell wall materials. In this study, the extraction rule of taste quality metabolites after tea green leafhoppers infestation was explored, and the influence of tea green leafhopper infestation on quality traits was explored from three aspects: tea picking, processing and brewing.

Key words: Camellia sinensis, tea green leafhopper, cell wall material, tenderness, extraction rate

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