Etude des modalites de la secretion de mucilage par les trichomes stipulaires de Psychotria bacteriophila (Rubiacees).

Colleters are secretory structures well distributed in many organs of Angiosperms. Ultrastructurally, the colleters secretory cell presents an enhanced endoplasmic reticulum, Golgi apparatus, and mitochondria. Secretion synthesis, transportation, and passage through outer cell wall is poorly characterized. This study characterized the anatomy and ultrastructure of BATHYSA NICHOLSONII (Rubiaceae) colleters and evaluated the presence of protein in the secretion and its antifungal property. Samples were collected and prepared according to usual techniques in light and electron microscopy, electrophoresis, and fungal growth inhibition assay. Colleters are of a standard type, cylindrical and elongated, formed by one secretory epidermal palisade layer, and a central axis formed by parenchymatic cells and a vascular trace. Epidermal cells have dense cytoplasm with abundant ribosome, a nucleus, enhanced endoplasmic reticulum and Golgi apparatus. The outer cell wall presented morphologically distinct layers. The presence of secretory cavities was noted in all outer cell wall extents. Secretion preparations analyzed by SDS-PAGE showed that B. NICHOLSONII secretion is a mixture of proteins with molecular masses covering a range of approximately 66 to 24 kDa. This preparation presented an inhibitory effect on the fungi spore growth.

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Etude des modalites de la secretion de mucilage par les trichomes stipulaires de Psychotria bacteriophila (Rubiacees).

Cited by 12 publications

References 18 publications

The short but useful life of Prepusa montana Mart. (Gentianaceae Juss.) leaf colleters—anatomical, micromorphological, and ultrastructural aspects

The short but useful life of Prepusa montana Mart. (Gentianaceae Juss.) leaf colleters—anatomical, micromorphological, and ultrastructural aspects

Dendroid colleters on vegetative and reproductive apices in Alibertia sessilis (Rubiaceae) differ in ultrastructure and secretion

Colleters in Bathysa nicholsonii K. Schum. (Rubiaceae): Ultrastructure, Secretion Protein Composition, and Antifungal Activity

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