Dynamic Changes on Floral Aroma Composition of the Three Species from Tilia at Different Flowering Stages

The floral aroma, sometimes known as an incorporeal gift of flowers, is one the primary ornamental features plants. Flowers genus Tilia are fragrant and have great value for development utilization. In this study, first time, headspace solid-phase microextraction (HS-SPME) gas chromatography-mass spectrometry (GC-MS) combined with chemometrics were used to analyze dynamic variations scent components three species from at different flowering stages. A total 70 volatile detected, 43 aroma compounds identified. UpSet diagram displayed in amount various stages each species. Partial least squares discriminant analysis (PLS-DA) indicated proximity composition characteristics significant that can distinguish another. Variable importance projection values (VIP) along Kruskal-Wallis non-parametric performed identify 14 crucial components, such α-Farnesene, D-Limonene, Germacrene D, Linalool, etc. end, we discovered that, sharp contrast miqueliana Maxim., cordata Mill. may a closely related phylogenetic relationship tomentosa Moench. by evaluating similarity rates.