Developmental and Diurnal Change of Fragrance Emission from ‘High noon' Flowers (Paeonia × lemonei 'High noon')

摘要

The paper aimed at discussion of the pattern of scent emission from tree peony.In this study,floral volatiles of‘High noon' (Paeonia × leraonei 'High noon'),a distant hybridization cultivar of tree peony,emitted from different flower developmental stages and during a day (8:00 am to 6:00 pm) were collected by dynamic headspace and then identified by Automated Thermal Desorption-Gas Chromatography/Mass Spectrometry (ATD-GC/MS).The results showed that 'High noon' emitted the highest amount of floral scent at early opening stage.Terpenoids were the most important volatile category.Among these terpenoids,linalool with the highest amount accounted for 40％ of total released amount at full opening stage and was considered as one characteristic compound of ‘High noon' flowers.During a day,the emission of floral volatiles displayed a significant diurnal pattern.The total released amount increased dramatically from 8:00 am to 12:00 pm and then decreased gradually.Most of the volatile categories showed the similar pattern to the total released amount,but the changing amplitude of terpenoids was biggest,the released amounts of which at 11:00-12:00 were more than 5 times higher than that at 8:00-9:00.The results would provide theoretical basis for exploring the biosynthesis and emission mechanism of f floral scent in ‘High noon' flowers.