PMC

PCA statistical analysis of no-volatile compounds in the processing of green tea (A), yellow tea (B), dark tea (C), oolong tea (D), black tea (E), and white tea (F). FL: fresh leaves, W: leaf withering, D: leaf de-enzyming, R: leaf rolling, Y: leaf yellowing, GT: green tea, YT: yellow tea; TD: tea dhool, PF: leaf pile-fermentation, DT: dark tea; WT: white tea, W24: withering 24 h, W48: withering 48 h, W72: withering 72 h; BT: black tea, BW: leaf withering, BR: leaf rolling, BF: leaf fermentation; OT: oolong tea, OW: leaf withering, TO: leaf turning-over, OD: leaf de-enzyming, OR: leaf rolling. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)

Changes in inner diameter of conducting tissue (A-F) and SEM pictures (G). FL: fresh leaves, W: green tea leaf withering, D: green tea leaf de-enzyming, R: green tea leaf rolling, Y: leaf yellowing, TD: tea dhool, PF: leaf pile-fermentation, W24: withering 24 h, W48: withering 48 h, W72: withering 72 h, BW: black tea leaf withering, BR: black tea leaf rolling, BF: leaf fermentation, OW: oolong tea leaf withering, TO: leaf turning-over, OD: oolong tea leaf de-enzyming, OR: oolong tea leaf rolling. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)

Differential metabolite analysis. (A) PCA statistical analysis; (B-C) OPLS-DA statistical analysis; (D-E) heatmap; FL: fresh leaves, W: leaf withering, D: leaf de-enzyming, R: leaf rolling, Y: leaf yellowing, GT: green tea, YT: yellow tea; TD: tea dhool, PF: leaf pile-fermentation, DT: dark tea; WT: white tea, W24: withering 24 h, W48: withering 48 h, W72: withering 72 h; BT: black tea, BW: leaf withering, BR: leaf rolling, BF: leaf fermentation; OT: oolong tea, OW: leaf withering, TO: leaf turning-over, OD: leaf de-enzyming, OR: leaf rolling. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)

(A) D1, Fresh jujube leaves; (B) D2, jujube leaf tea; (C) Jujube leaves used in green tea processing (Left: the fruit bearing shoots, Right: the leaves used in green tea processing).