Metabolomics Data Revealed Metabolite Changes during Endocarp Lignification in Kernel-Using Apricot

To understand the metabolite dynamics and genetic regulatory mechanism of apricot shell, a typical endocarp, before after lignification are unknown, we investigated differences endocarp ‘Youyi,’ popular kernel-using cultivar, using ultra-performance liquid chromatography tandem mass spectrometry strategy. The thickness increased rapidly from 8 to 37 days flowering (DAF) lignin deposition began at DAF. In total, 626 non-volatile metabolites were obtained tissues (33 DAF) (41 45 lignification. relative sugar organic acid contents decreased continuously those L-phenylalanine L-tyrosine non-lignified phenylpropanoid mainly in form p-coumaric acid, ferulic neochlorogenic dicumarol, coniferin, some lignans. After lignification, glycoside or lactone coumarins, L-asarinin forsythin increased. results transcriptome confirmed upregulation genes related biosynthesis, including ?-glucosidase coniferyl-alcohol glucosyltransferase laccases, accelerated This study provides insights into formation lignified clarifies role monolignin transport oxidative polymerization.