Glandular trichomes of Ceratotheca triloba (Pedaliaceae): morphology, histochemistry and ultrastructure.
Summary of "Glandular trichomes of Ceratotheca triloba (Pedaliaceae): morphology, histochemistry and ultrastructure."
This study was initiated to characterize the distribution, morphology, secretion mode, histochemistry and ultrastructure of the glandular trichomes of Ceratotheca triloba using light and electron microscopy. Its leaves bear two morphologically distinct glandular trichomes. The first type has long trichome with 8-12 basal cells of pedestal, 3-14 stalk cells, a neck cell and a head of four cells in one layer. The second type has short trichome comprising one or two basal epidermal cells, a unicellular or bicellular stalk and a multicellular head of two to eight cells. There is a marked circular area in the upper part of each head cell of the long trichome. This area is provided with micropores to exudate directly the secretory product onto the leaf surface by an eccrine pathway. The secretory product has copious amount of dark microbodies arising from plastids which are positive to Sudan tests and osmium tetroxide for unsaturated lipids. The secretion mode of short trichomes is granulocrine and involves two morphologically and histochemically distinct vesicle types: small Golgi-derived vesicles which are positive to Ruthenium Red test for mucilaginous polysaccharides; the second type is dark large microbodies similar to that of long trichomes with low quantity. These two types are stored in numerous peripheral vacuoles and discharge their contents accompanied by the formation of irregular invaginations of the plasmalemma inside the vacuoles via reverse pinocytosis. These two secretion modes of long and short trichomes are reported for the first time in the family Pedaliaceae. The long trichomes have more unsaturated lipids, while the short trichomes contain more mucilaginous polysaccharides.
Affiliation
School of Life Sciences, University of KwaZulu-Natal, P/Bag X54001, Durban, 4000, South Africa, naidooy1@ukzn.ac.za.
Journal Details
This article was published in the following journal.
Name: Planta
ISSN: 1432-2048
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22696008
- DOI: http://dx.doi.org/10.1007/s00425-012-1671-5
Medical and Biotech [MESH] Definitions
Rhodamines
A family of 3,6-di(substituted-amino)-9-benzoate derivatives of xanthene that are used as dyes and as indicators for various metals; also used as fluorescent tracers in histochemistry.
Sesamum
A plant genus of the family PEDALIACEAE that is the source of the edible seed and SESAME OIL.
Harpagophytum
A plant genus of the family PEDALIACEAE. Members contain harpagoside and are the source of extract WS 1531.
Pedaliaceae
The sesamum family of the order Scrophulariales, subclass Asteridae, class Magnoliopsida that are mainly herbs and shrubs growing in warm regions.
Neoplasms, Glandular And Epithelial
Neoplasms composed of glandular tissue, an aggregation of epithelial cells that elaborate secretions, and of any type of epithelium itself. The concept does not refer to neoplasms located in the various glands or in epithelial tissue.
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