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Type: Artigo de periódico
Title: Colleters in monocots: New record for Orchidaceae
Author: MAYER, Juliana Lischka Sampaio
Abstract: Colleters are widely occurring in eudicots showing relevant taxonomic importance in several families. Nevertheless, there are few records in monocots, restricted to only one description of these glands in Orchidaceae. The genus Oncidium is polyphyletic, currently the subject of taxonomic studies. In this context, the secretory structures can be an important diagnostic character that may help in the delineation of this group. O. flexuosum Sims presents colleters in vegetative - leaf primordium of protocorms, apical and axillary buds in the mature rhizomes - and reproductive organs - at the base of bracts, bracteoles and sepals. All the colleters observed are finger-like trichomes, composed of two uniseriated cells, where the apical one is elongated and possesses dense cytoplasm. The exsudate accumulates in a subcuticular space. causing displacement of the cuticle. Histochemical tests indicate the presence of mucilage in association with lipophilic and proteinic compounds inside the secretory cell. Secretion is abundant, hyaline and slightly viscous. The localization of the trichomes and their exsudate indicate the involvement of these colleters with the protection of meristematic regions in vegetative and reproductive organs. These results can be useful in the taxonomy of the genus Oncidium and for future studies about colleters in monocots. (C) 2010 Elsevier GmbH. All rights reserved.
Subject: Anatomy
Oncidium flexuosum Sims
Plant exsudates
Primordial protection
Country: Alemanha
Citation: FLORA, v.206, n.3, p.185-190, 2011
Rights: fechado
Identifier DOI: 10.1016/j.flora.2010.09.003
Date Issue: 2011
Appears in Collections:IB - Artigos e Outros Documentos

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