Comparison of fourteen differential metabolites of kaempferol and kaempferol derivatives between SJL and SN. These 14 metabolites were divided into 2 biomarkers and 12 common differential metabolites (CDMs). Upregulation denotes that the content of a metabolite increased in SN when compared with that in SJL. The Y-axis is shown as Log2FC values for the convenience of visual presentation (Note: The up-amplitude in the text refers to the FC value). The X-axis denotes the metabolite name. Abbreviations: 6Hk3OR6OG, 6-hydroxykaempferol-3-O-rutinoside-6-O-glucoside; kaempferitrin, kaempferol 3,7-dirhamnoside; nicotiflorin, kaempferol 3-O-rutinoside; K3OR, kaempferol 3-O-robinobioside; K7OR, kaempferol 7-O-rhamnoside; kaempferin, kaempferol 3-rhamnoside; astragalin, kaempferol 3-β-d-glucopyranoside; trifolin, kaempferol-3-O-galactoside; 6Hk376OT, 6-hydroxykaempferol-3,7,6-O-triglycoside; K3OR7OG, kaempferol 3-O-rutinoside 7-O-glucoside; K7OG, kaempferol 7-O-glucoside; 6Hk36OD, 6-hydroxykaempferol-3,6-O-diglucoside; Dk, dihydrokaempferol.