山桃花香气的日变化规律

Daytime Variation of Floral Scent of Prunus davidiana Carr

为了揭示山桃盛开期香气的日变化规律,采用活体植株动态顶空采集法收集一天中不同时间(6∶00、9∶00、12∶00、15∶00、18∶00、21∶00)山桃花释放的香气,再利用自动热脱附-气相色谱/质量色谱联用技术(ATDGC/MS)鉴定花香成分、并分析其释放量。结果表明:山桃花香成分中共检测出43种挥发性物质,在化学结构上分别属于苯形烃类,醇类、醛类、萜烯类、酮类、脂肪烃类、酯类和其它类,共8大类。不同时间点,山桃花香释放的化合物种类和数量不同,花香成分的种类随时间呈现出逐渐增加的趋势,而释放量则表现出先增加后减少的规律,总释放量在15∶00达到最高。在所有的化合物中,1,3-二甲基苯、2-乙基-1-己醇、乙苯、对二甲苯和甲基辛醚是所有时间点共有的主要挥发物质,释放量也较高,从而可推断这些化合物是山桃盛花期香气的主要成分。

In order to explore the daytime variation pattern of floral scent emitted fromPrunus davidiana Carr.at the full-bloom stage,using dynamic headspace method,the floral scent was collected at different time points（6∶00,9∶00,12∶00,15∶00,18∶00,21∶00）,the components and release amounts were analyzed by ATD-GC/MS technique.The results showed that 43 volatile compounds were detected,belonging to 8volatile categories,including benzenoid and derivative,alcohol,aldehyde,terpenoid,ketone,fatty hydrocarbon,ester and others.The total release amount firstly increased,and then decreased along with time,and reached the peak at 15∶00.Among the components,1,3-dimethyl-benzene,2-ethyl-1-hexanol,ethylbenzene,p-xylene and methyl-octyl-ether showed relatively higher release amounts,which were thought as the main components of the floral scent emitted fromP.davidiana Carr.at the full-bloom stage.