In order to understand reddening mechanism of Liquidambar formosana leaves,taking full green(S1),semi-red(S2)and full red(S3)leaves as test materials,color parameter values,contents of chlorophylls and polyphenol compounds such as procyanidins,flavonoids and anthocyanins were determined.Differential metabolites with up-regulation effects of polyphenol compounds such as procyanidins,flavonoids and anthocya-nins in reddening of L.formosana leaves were determined based on metabolomics technology.Results showed that with reddening of L.formosana leaves,contents of chlorophylls decreased,contents of polyphenol com-pounds such as anthocyanins increased.4 kinds of procyanidins,8 kinds of flavonoids and 36 kinds of anthocya-nins were identified.There were 18 differential metabolites with up-regulation effects and 12 differential com-pounds between S1 and S3 leaves.There were 14 differential metabolites with up-regulation effects and 7 dif-ferential compounds between S1 and S2 leaves.There were 12 differential metabolites with up-regulation ef-fects and 5 differential compounds between S2 and S3 leaves.Polyphenol compounds such as anthocyanins were main compounds responsible for reddening of L.formosana leaves.Procyanidin B2,quercetin-3-O-gluco-side and dihydromyricetin were auxiliary components responsible for reddening of L.formosana leaves.
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