芳香型蝴蝶兰花朵挥发性成分的比较分析OA

Taking three aromatic Phalaenopsis cultivars,Phal.'Bizihao',Phal.'Jinshu',and Phal.'Chaojibanma'as experimental materials,headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry(HS-SPME-GC-MS)was employed to investigate the composition and distribution characteristics of volatile compounds in different floral organs(sepals,petals,and lips),in order to provide a reference for elucidating the aroma formation mechanism and evaluating the quality of aromatic Phalaenopsis.The results showed that a total of 64 volatile compounds were identified,belonging to eight categories including terpenes,aldehydes,and aromatics,with terpenes accounting for the highest proportion.Terpenes and aldehydes were widely distributed across different floral organs of all cultivars,whereas esters were detected exclusively in Phal.'Chaojibanma'.Six volatile compounds,geraniol,β-myrcene,acetaldehyde,leaf aldehyde,natural nonanoic acid,and 2,5-dimethylbenzaldehyde,were commonly detected in all cultivars,with hexanal and leaf aldehyde being ubiquitous in all tested samples.Linalool,geraniol,2,6-nonadienal,β-pinene,trans-2-nonenal,and hexanal contributed significantly to the aroma and were identified as key components constituting the primary floral scent.Correlation analysis indicated that cultivar type significantly affected the accumulation of terpenes and aromatic compounds,while floral organ type predominantly influenced the distribution of esters.Furthermore,significant correlations were observed among different compound categories.