Shading effects revisited:Comparisons of spring and autumn shading treatments reveal a seasonal-dependent regulation on amino acids in tea leaves  

作　　者：Wenfeng Zhu Xuyang Liu Xin Cheng Yingying Li Linlin Liu 

机构地区：[1]State Key Laboratory of Tea Plant Biology and Utilization,Anhui Agricultural University,West 130 Changjiang Road,Hefei 230036,Anhui,China

出　　处：《Beverage Plant Research》2023年第1期42-50,共9页饮料植物研究（英文）

基　　金：supported by the National Key Research and Development Program[2021YFD1601103];the National Natural Science Foundation of China[32072623];the Anhui University Graduate Scientific Research Project[YJS20210246].

摘　　要：Shading is an effective way to improve tea quality by modulating the accumulation of the flavor-related secondary metabolites of tea leaves.However,shading effects on amino acids have been conflicting for years as both shading-induced increases and decreases have been detected.This study aims to investigate the effects of shading levels on catechins and amino acids,in particular,a comparison was made in April and August to better understand the involvement of seasonal environmental parameters.Shading reduced major catechins(catechin,gallocatechin,epicatechin,epigallocatechin,epicatechin gallate,and epigallocatechin gallate)in both seasons.Heavy shading(80%−90%)increased total and individual amino acids(threonine,glutamic acid,and alanine)in April but decreased those in August.In both seasons,ᴏ-Phosphoethanolamine increased under heavy shading,butα-aminoadipic acid,ornithine and glutamine showed decreases.Theanine showed no shading response in April but decreased under heavy shading in August.These results indicate that shading-induced reduction of leaf catechins is mainly determined by shading level,but the shading effects on amino acids are seasonally-dependent.As our first report focuses on the synergistic effects of seasons,this study improves our understanding of shading regulation on secondary metabolites of tea leaves and guides shading treatments to improve tea quality.

关 键 词：parameters. SYNERGISTIC SEASONAL 

分 类 号：S571.1[农业科学—茶叶生产加工]