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ORIGINAL ARTICLE
Year : 2021  |  Volume : 17  |  Issue : 75  |  Page : 558-564

Trichomes of Coleus forskohlii: Morphology and Volatile Compounds


1 College of Pharmacy, Hubei University of Chinese Medicine; Hubei Key Laboratory of Traditional Chinese Medicine Resource and Chemistry, Hubei University of Chinese Medicine, Wuhan, China
2 Hubei Key Laboratory of Traditional Chinese Medicine Resource and Chemistry, Hubei University of Chinese Medicine, Wuhan, China
3 College of Pharmacy, Hubei University of Chinese Medicine, Wuhan, China
4 State Key Laboratory of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
5 Postdoctoral Research Center, Furen Pharmaceutical Co., Ltd., Tongcheng, China

Correspondence Address:
Bisheng Huang
College of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065
China
Kun Yu
College of Pharmacy, Hubei University of Chinese Medicine, Wuhan 430065; Hubei Key Laboratory of Traditional Chinese Medicine Resource and Chemistry, Hubei University of Chinese Medicine, Wuhan 430060
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/pm.pm_427_20

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Background: Coleus forskohlii (Lamiaceae) cultivates imperishably over the tropical and subtropical regions of Asia; extracts from the roots and aerial parts of C. forskohlii are widely employed for the therapy of respiratory disorders, gastro-intestinal disturbance, heart diseases, and central nervous system disorders. The morphologies and structures of trichomes from C. forskohlii, as well as phytochemicals they secrete in China-origin plants are poorly unstated. 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.


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