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 Shuhua; MAO Kaiquan; CHEN Jiaming; LI Jianlong; XUE Jinghua; ZENG Lanting; YANG Yuhua; GU Dachuan

doi:10.13305/j.cnki.jts.2023.06.005

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

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 Shuhua^1,2,3,4, MAO Kaiquan^1,3,4, CHEN Jiaming^1,3,4, LI Jianlong², XUE Jinghua^1,4, ZENG Lanting^1,3,4, YANG Yuhua^1,4, GU Dachuan^1,3,4,*

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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 / cell wall material / extraction rate / tea green leafhopper / tenderness

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WU Shuhua, MAO Kaiquan, CHEN Jiaming, LI Jianlong, XUE Jinghua, ZENG Lanting, YANG Yuhua, GU Dachuan. 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[J]. Journal of Tea Science. 2023, 43(6): 806-822 https://doi.org/10.13305/j.cnki.jts.2023.06.005

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