Abstract
The distribution and types of glandular trichomes and essential oil chemistry of Thymus quinquecostatus were studied. The glandular trichomes are distributed on the surface of stem, leaf, rachis, calyx and corolla, except petiole, pistil and stamen. Three morphologically distinct types of glandular trichomes are described. Peltate trichomes, consisting of a basal cell, a stalk cell and a 12-celled head, are distributed on the stem, leaf, corolla and outer side of calyx. Capitate trichomes, consisting of a unicellular base, a 1–2-celled stalk and a unicellular head, are distributed more diffusely than peltate ones, existing on stem, leaf, rachis and calyx. Digitiform trichomes are just distributed on the outer side of corolla, consisting of 1 basal cell, 3 stalk cells and 1 head cell. All three types of glandular trichomes can secrete essential oil, and in small capitate trichomes of rachis, all peltate trichomes and digitiform trichomes, essential oil is stored in a large subcuticular space, released by cuticle rupture, whereas, in other capitate trichomes, essential oil crosses the thin cuticle. The essential oil of T. quinquecostatus is yellow, and its content is highest in the growth period. 68 constituents were identified in the essential oils. The main constituent is linalool.
Highlights
There are external and internal secretory structures identified based on their positions in the plant organs
The capitate trichome consists of a basal cell, a stalk cell, and a unicellular head cell
Figure 4: ((a), (b)) Scanning Electron Microscopy (SEM) micrographs showing the morphology of glandular trichomes on outer side of calyx of T. quinquecostatus. (a) Peltate trichomes (p) and capitate trichomes (c). (b) A capitate trichome. ((c), (d)) Transverse sections of T. quinquecostatus calyx. (c) A peltate trichome. (d) A capitate trichome
Summary
There are external and internal secretory structures identified based on their positions in the plant organs. Studies on the glandular trichomes attracted many scholars these years Due to their abundant physiological activities, plant essential oils are used in various fields, especially the Thymus species essential oil. Essential oil of Thymus quinquecostatus is often effective as an antibiosis, an insecticide, an antitumor substance, and so on [2, 3]. As a result, it has been widely used in the pharmaceutical industry, the cosmetic industry, the food industry, and so forth [4, 5]. The aim of this research is to conduct a systematic study on glandular trichomes and essential oil of Thymus quinquecostatus
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
