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Glandular Hairs (glandular + hair)

Distribution by Scientific Domains
Chemistry66%
Life Sciences33%

Selected Abstracts

Ultrastructure, development and histochemistry of the polysaccharide-containing subcuticular compartments in Origanum dictamnus L. peltate glandular hairs

FLAVOUR AND FRAGRANCE JOURNAL, Issue 4 2010
Artemios M. Bosabalidis
Abstract Peltate glandular hairs of Origanum dictamnus at the stage of secretion create two subcuticular chambers; one large and bladder-like, at the apex of the head (containing essential oil), and one small and ring-like, at the bottom of the head (containing polysaccharides). In the apical chamber, along with the essential oil, a small lateral compartment containing polysaccharides, also exists. This compartment surrounds peripherally the apical chamber creating a second ring-like structure. The apical plasmalemma of the head cells exhibits a high electron density and presumably has a specific substructure to facilitate passing to the subcuticular chamber of the secretory product. The latter probably exists in the form of glucosides, which, after passing across the plasmalemma and entering the apical chamber, become hydrolysed into the aglycone fraction (essential oil) and the sugar fraction (polysaccharides). Copyright © 2010 John Wiley & Sons, Ltd. [source]

The volatile constituents of Artemisia marschaliana Sprengel and its secretory elements

FLAVOUR AND FRAGRANCE JOURNAL, Issue 2 2002
L. Ahmadi
Abstract The structure of the glandular hairs and secretory canals and the essential oil of the aerial parts of Artemisia marschaliana growing in Iran were studied. The leaves of this plant had glandular hairs and the other kind of secretory tissues are canals which are seen in the stems and leaves and act in the conduction of volatile oils. The volatile constituents, isolated by hydrodistillation, were analysed by GC,MS. The oil was found to contain 20 components. The oil sample consisted mainly of sesquiterpene (62.7%), germacrene-D (23.7%), bicyclogermacrene (14.9%) and spathulenol (9.9%) as the main components. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Structures, Components and Functions of Secretory Tissues in Houttuynia cordata

JOURNAL OF INTEGRATIVE PLANT BIOLOGY, Issue 12 2007
Xi-Lu Ni
Abstract Houttuynia cordata Thunb., traditionally used as a therapeutic plant in folk medicine, has shown antioxidant and anticancer activities. The species, as a core component of paleoherbs, is normally characterized based on the presence of different types of secretory tissue: oil cells, three types of secretory cells and glandular hairs. The aim of this work was to study the structural, componential, and the functional characteristics of the secretory tissues in both the floral and vegetative parts. The results indicate that oil cells and secretory cells are distributed in all organs of the plant, while glandular hairs are situated on the aerial stems and leaves. Both oil cells and glandular hairs initiate from the protoderm, but their developmental processes are different. Although three types of secretory cells initiate from different primary meristems, the developmental patterns of different secretory cells are the same. Also, although the origins of secretory cells are different from oil cells, their early developmental processes are the same. Histochemical results show that oil cells, secretory cells and glandular hairs produce flavonoids, phenolic compounds, tannins, lipids, aldehyde and ketone-compounds. In addition, there are terpenoids and pectic-like substances in oil cells, alkaloids in secretory cells of aerial stems, and terpenoids and alkaloids in glandular hairs. These compounds play very important roles in protecting plants from being eaten by herbivores (herbivory) and infected by microbial pathogens. The oil cell and secretory cell, as unicellular secretory tissues, are intermediates between the primitive surface glandular and secretory cavity and canal during the evolution of secretory structures. [source]

A new species of Aeschynomene L. (Leguminosae, Papilionoideae) from a continental sand dune area in north-eastern Brazil

BOTANICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 4 2008
LUCIANO P. QUEIROZ
Aeschynomene sabulicola L.P. Queiroz & D. Cardoso is proposed as a new species of the section Ochopodium. This new species seems to be related to the series Viscidulae, as it presents herbaceous, slender branches, densely covered by viscid glandular hairs. However, it possesses fruits much larger than expected for this series. Aeschynomene sabulicola can be diagnosed by the erect habit, reaching c. 3.5 m high, inflorescences divaricate and horizontal with remote flowers, and fruits with only one subreniform article, this measuring 13,14 × 7,8 mm. The species occurs only in a continental sand dune area along the middle São Francisco River basin in the State of Bahia, north-eastern Brazil. © 2008 The Linnean Society of London, Botanical Journal of the Linnean Society, 2008, 157, 749,753. [source]

Compositions of Essential Oils and Trichomes of Teucrium chamaedrys L. subsp.

CHEMISTRY & BIODIVERSITY, Issue 1 2009
subsp. syspirense (C. Koch) Rech. fil., trapezunticumRech. fil.
Abstract Teucrium chamaedrys L. is a member of the Lamiaceae family and is represented in the Flora of Turkey by six subspecies. The aerial organs of T. chamaedrys L. subsp. trapezunticumRech. fil. and subsp. syspirense (C. Koch) Rech. fil. bears numerous eglandular and glandular trichomes. Eglandular trichomes are simple, long-multicellular with cuticular micropapillae, and glandular hairs are of peltate and capitate types. The peltate hairs consist of a basal cell, a short unicellular stalk, and multicellular secretory head, and the capitate ones possess 1,2 stalk cells and one glandular head cell. The aerial parts were subjected to microdistillation for the isolation of volatiles. The analysis was simultaneously performed by using gas chromatography (GC) and gas chromatography/mass spectrometry (GC/MS). The major components were characterized as , -caryophyllene (18%), nonacosane (12%), germacrene D (11%), caryophyllene oxide (7%), and ,- pinene (7%) for subsp. trapezunticum, and caryophyllene oxide (23%), ,- pinene (11%), and caryophyllenol II (5%) for subsp. syspirense. [source]