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Flavonoids are a class of commonly occurring natural compounds in the plant kingdom with various biological activities. This study compares the content of flavonoids in Cyclocarya paliurus at different developmental stages to better inform the selection of the optimal picking period. Thus, we analyzed the transcriptome and metabolome of C. paliurus at different developmental stages. The transcriptome analysis revealed 44 genes involved in the biosynthesis of flavonoids in C. paliurus , with 10 differentially expressed genes across the four different developmental stages. The metabolites were separated and identified by a combination of chromatography and mass spectrometry, followed by multi-reaction monitoring mode analysis of triple quadrupole mass spectrometry for complete metabolite quantification. In the flavonoid synthesis pathway, a total of 137 differential flavonoids were detected. The joint transcriptome and metabolome analysis showed that the expression trends in differential metabolites and genes were significantly related. Four MYB transcription factors and two bHLH transcription factors that are closely related to flavonoid biosynthesis were identified. The regulation network of flavonoid biosynthesis in C. paliurus was thus established, providing guidance for follow-up research.

Joint Transcriptomic and Metabolic Analysis of Flavonoids in Cyclocarya paliurus Leaves