NDLI: Foliar secretory trichomes of Ocimum obovatum (Lamiaceae): micromorphological structure and histochemistry

Content Provider	Springer Nature Link
Author	Naidoo, Yougasphree Kasim, Nazeera Heneidak, Samia Nicholas, Ashley Naidoo, Gonasageran
Copyright Year	2013
Abstract	This study characterises the micromorphology, ultrastructure and main chemical constituents of the foliar glandular trichomes of Ocimum obovatum using light and electron microscopy and a variety of histochemical tests. Two types of glandular trichomes occur on the leaves: large peltate and small capitate. The head of each peltate trichome is made up of four broad head cells in one layer. The head of each capitate trichome is composed of two broad head cells in one layer (type I) or a single oval head cell (type II, rare). In peltate heads, secretory materials are gradually transported to the subcuticular space via fracture in the four sutures at the connecting walls of the head cells. Release to the head periphery occurs through opposite fracture in the four sutures in the head cuticle. In type I capitate trichomes, release of the secretions to the subcuticular space occurs via a pore between the two head cells, and release to the head periphery occurs through the opposite pore in the head cuticle. In type II capitate trichomes, the secreted material is released from the head cell through a ruptured particular squared area at the central part of the head cuticle. These secretion modes are reported for the first time in the family Lamiaceae. Histochemical tests showed that the secretory materials in the glandular trichomes are mainly essential oils, lipophilic substances and polysaccharides. Large peltate trichomes contain a large quantity of these substances than the small capitate trichomes. Ultrastructural evidence suggests that the plastids produce numerous lipid droplets, and the numerous polysaccharide small vesicles are derived from Golgi bodies.
Starting Page	873
Ending Page	885
Page Count	13
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	299
Issue Number	5
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2013-02-22
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Capitate trichomes Cat’s whiskers Medicinal plant Non-glandular trichomes Peltate trichomes Secretion mode Subcuticular space Plant Sciences Plant Ecology Plant Anatomy/Development Plant Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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