Article · Volume 17, Issue 75 · pp. 558–564
Trichomes of Coleus forskohlii: Morphology and Volatile Compounds
Xiao Huang2,3, Pengtao You1, Yulin Chen2, Tian Zhang4, Ling Gong2, Pencheng Zou5, Weisong Li5, Lei Wang5, Yanwen Liu2,3, Kun Yu2,3, Bisheng Huang2
- 1College of Pharmacy, Hubei University of Chinese Medicine, China.
- 2Hubei Key Laboratory of Traditional Chinese Medicine Resource and Chemistry, Hubei University of Chinese Medicine, Wuhan, China.
- 3State Key Laboratory of Dao‑di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China.
- 4Postdoctoral Research Center, Furen Pharmaceutical Co., Ltd., Tongcheng, China.
Abstract
Objectives: This study was intended to characterize the morphology and structure of trichomes and the profile of their secretory materials.Materials and Methods: To characterize the morphology and structure of trichomes, which happen on the vegetative and reproductive organs of C. forskohlii, it was employed light microscopy and scanning electron microscopy. The chemical qualities of volatile compounds from Glandular trichomes (GTs) of C. forskohlii were also studied using gas chromatography mass spectrometry (GC‑MS) and histochemical reactions.Results: Four morphologically distinct trichomes, i.e., non GTs, peltate GTs, Type 1 and 2 capitate GTs, were categorized. Histochemical study naked the presence of polyphenols, flavonoids, lipids, and terpenes in the GTs. Essential oils, isolated from mature leaves by hydro‑distillation, were investigated by GC‑MS and 41 compounds were acknowledged with oxygen‑containing sesquiterpenes and monoterpenes as the major compounds.Conclusion: Secretory materials of GTs attained by surface extraction also indicated the precise features in the China‑origin samples.
Keywords: Coleus forskohlii; essential oil; histochemistry; secretory material; trichomes
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