Fig. 5

Relative amounts of individual metabolites of fresh tea leaves from Jangwon 2 and Jangwon 3 tea cultivars collected in vintage years 2015, 2016, 2017, 2018 and 2019, respectively. The different small and capital letters in the vertical graph bars of each panel indicate significant differences in the level of each metabolite between the five vintage years of Jangwon 2 and Jangwon 3 tea cultivars, respectively. Asterisks represent significant differences in the levels of each tea metabolite between Jangwon 2 and Jangwon 3 tea cultivars in the same vintage year. Statistically significant differences in relative amounts of tea metabolites were determined by one-way ANOVA with Duncan’s multiple range test at P < 0.05 and paired t-test. Small and large letters denote statistical differences in Jangwon 2 and 3 tea cultivars, respectively, and asterisks indicate statistical differences between Jangwon 2 and 3 tea cultivars in the given vintage. Ala, alanine; Ara 2-O-(β-L-Arabinopyranosyl)-myo-inositol, EC epicatechin, ECG epicatechin gallate, EGC epigallocatechin, EGCG epigallocatechin gallate, EGCG3''Me, epicatechin 3-O-(3-O-methyl)-gallate, GABA γ-aminobutyrate, GC gallocatechin