浙江农业学报 ›› 2024, Vol. 36 ›› Issue (12): 2727-2738.DOI: 10.3969/j.issn.1004-1524.20231145

• 园艺科学 • 上一篇    下一篇

五种珍稀濒危兰花的挥发性成分分析

王苗苗(), 秦嘉泽   

  1. 北京市植物园 管理处,北京市花卉园艺工程技术研究中心,北京 100093
  • 收稿日期:2023-09-25 出版日期:2024-12-25 发布日期:2024-12-27
  • 作者简介:王苗苗(1986—),女,河南新蔡人,学士,高级工程师,主要从事兰科植物引种展示、科普和保育研究。E-mail:pleasewang@163.com
  • 基金资助:
    北京市公园管理中心课题(2021011)

Volatile components in flowers of 5 rare and endangered orchids

WANG Miaomiao(), QIN Jiaze   

  1. Beijing Floriculture Engineering Technology Research Centre, Management Office, Beijing Botanical Garden, Beijing 100093, China
  • Received:2023-09-25 Online:2024-12-25 Published:2024-12-27

摘要:

为了评价和筛选有价值的芳香种质资源,对比珍稀濒危兰花中的“香花”和“臭花”在挥发性成分、含量和关键香气化合物等方面的异同,以具有怡人香气(即“香花”)的晶帽石斛(Dendrobium crystallinum)、杓唇石斛(Dendrobium moschatum)、球花石斛(Dendrobium thyrsiflorum)和带有不愉悦气味(即“臭花”)的领带兰(Bulbophyllum phalaenopsis)、棘唇石豆兰(Bulbophyllum echinolabium)的盛花期花朵为试验材料,采用箭型固相微萃取技术和气相色谱-质谱联用技术(SPME Arrow-GC-MS),结合相对气味活度值(rOAV)开展分析。结果共鉴定出675种挥发性成分,包含萜类、杂环化合物、酯类、烃类、酮类、醇类、醛类、芳香族化合物等。其中,萜类的相对含量最高,包含的挥发性物质种类也最多,杂环化合物、酯类等次之。供试的5种珍稀濒危兰花的挥发性成分存在种属特异性,但均以萜类、杂环化合物、酯类、烃类、酮类、醇类、醛类为主,相对含量合计达90%以上,挥发性成分的数量从高到低依次为晶帽石斛>杓唇石斛>棘唇石豆兰>领带兰>球花石斛。晶帽石斛、杓唇石斛、球花石斛、领带兰、棘唇石豆兰分别含有104、87、72、90、77种关键香气化合物,醛类化合物是影响兰花整体香气的主要贡献物。领带兰中的二乙基二硫醚与二甲基三硫、棘唇石豆兰中的3-甲基-1H-吲哚与二甲基三硫为“臭花”的特殊气味形成作出较大贡献。这5种兰花特有的香气成分极具资源利用价值,其中,晶帽石斛和杓唇石斛的挥发性成分中可能存在兔耳草醛。

关键词: 兰花, 箭型固相微萃取技术, 挥发性成分, 相对气味活度值

Abstract:

In order to evaluate and screen out valuable aromatic germplasm resources, the flowers of rare and endangered orchids, namely, Dendrobium crystallinum, D. moschatum, D. thyrsiflorum, Bulbophyllum phalaenopsis and B. echinolabium were used as materials, and the similarities and differences of volatile components, contents and key aroma compounds were compared between the “fragrant flower” and “smelly flower”. Solid-phase microextraction arrow combined with gas chromatography-mass spectrometry (SPME Arrow-GC-MS) and relative odor activity (rOAV) were used for identification and analysis. A total of 675 volatile compounds were identified, including terpenoids, heterocyclic compound, esters, hydrocarbons, ketones, alcohols, aldehydes and aromaticity. Terpenoids were the highest in relative content and the most abundant in volatile substances, followed by heterocyclic compound and esters. The volatile components of the five rare and endangered orchids were species-specific, yet terpenoids, heterocyclic compound, esters, hydrocarbons, ketones, alcohols and aldehydes were the major constituents, which accounted for more than 90% in total. The quantity of volatile components in the flowers of the five orchids decreased in the order of D. crystallinum>D. moschatum>B. echinolabium>B. phalaenopsis>D. thyrsiflorum. There were 104, 87, 72, 90 and 77 key aroma compounds in the flowers of D. crystallinum, D. moschatum, D. thyrsiflorum, B. phalaenopsis and B. echinolabium, respectively, Aldehydes were the main contributors to the overall aroma of orchids. Diethyl disulfide compounds and dimethyl trisulfur compounds in B. phalaenopsis, and indole, 3-methyl and dimethyl trisulfide in B. echinolabium were the main contributors for their unique odor formation. The volatile components of the 5 species of orchids were valuable for resource utilization. The volatile components in the flowers of D. crystallinum and D. moschatum might contain cyclamen aldehyde.

Key words: orchids, solid-phase microextraction arrow, volatile component, relative odor activity

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