To better utilize the stem and leaf of Cyperus esculentus and facilitate its crop breeding,relationship was studied between phenotypic features and stem-and-leaf metabolites,by investigating phenotypic parameters of 10 cultivars.The parameters including leaf width,tuber width,tuber thickness and tuber height,were compared and analyzed.Stem and leaf metabolites were qualitatively and quantitatively analyzed by ultra-high performance liquid chromatography tandem mass spectrometry(UHPLC-MS/MS).Results showed that 10 cultivars of C.esculentus were divided into 2 phenotypes,namely wide-leaf round-tuber type and narrow-leaf long-tuber type.Their leaf width was positively correlated with tuber width and tuber thickness.Relative contents of 28 main metabolites were discovered and investigated including flavane-3-ols,caffeic acids and flavonoids.Results showed that the contents of 4 flavonoids(luteolin 7-O-diglucuronide,luteolin 8-C-glucoside,luteolin 7-glucuronide,and luteolin)were sig-nificantly higher in wide-leaf round-tuber C.esculentus leaves.Biosynthesis pathways of the 4 differential flavo-noids metabolites were deduced and mapped using KEGG and PlantCyc.It was predicted that the wide-leaf round-tuber type was more drought-tolerant than the narrow-leaf long-tuber ones.
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