The Structure of Colleters in Several Species of Simira (Rubiaceae)

Klein, Denise Espellet; Gomes, Valdirene Moreira; Neto, Sebastião José da Silva; Cunha, Maura Da

doi:10.1093/aob/mch198

Cited by 99 publications

(93 citation statements)

References 33 publications

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“…As claimed for polysaccharides, lipid compounds may help avoid water loss, in addition to prohibiting fungal and microorganism attack, since this hydrophobic substance lubricates the surface of young leaves and floral buds, (Fahn 1979;Thomas & Dave 1989;Thomas 1991;Evert 2006;Paiva 2009;Mayer et al 2013). Proteins have also been reported as a component of the secretion produced by colleters from a variety of different species (Thomas & Dave 1990;Klein et al 2004;Miguel et al 2006;González & Tarragó 2009;Mayer et al 2011;Dalvi et al 2013). Some authors have suggested that such proteins may provide additional protection from fungi and parasites (Miguel et al 2006;Vieira et al 2006;Mayer et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

et al. 2017

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Th e genus Chamaecrista contains ca. 330 species organized into six sections, of which section Chamaecrista is the second largest (ca.75 species) distributed among six series, while the section Caliciopsis contains only two species. Colleters have been described in the genus Chamaecrista and they show potential taxonomic and phylogenetic signifi cance. Th ey are associated with lubrication, desiccation prevention and protection from microbial attacks of young developing organs. Although six types of colleters have been described for the genus Chamaecrista, there have been no studies focusing on the diversity of colleters in the sections Chamaecrista and Caliciopsis. Samples from developing leaves and fl owers of both sections were obtained from herbarium and fi eld collections and subjected to standard methodologies for both light and scanning electron microscopy. Histochemical tests were also performed to determine the nature of the exudates. Five types of non-vascularized colleters were found: short digitiform, long digitiform, club-shaped, pyriform and short bottle-shaped. Polysaccharides, pectins, lipids and proteins were detected in the exudates of all types of colleters. Among the fi ve types of colleters observed, pyriform is a novelty for Chamaecrista, reinforcing the signifi cant morphological diversity of these secretory structures in this genus.

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Section: Discussionmentioning

confidence: 99%

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

et al. 2017

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“…Klein et al (2004) observed that the colleters of Simira pikia are distributed in a line at the base of the stipule, while the colleters of S. glaziovii form two triangles at the base of the stipule. Miguel et al (2006) observed that the colleters of three species of Bathysa are distributed at the base of the stipules.…”

Section: Introductionmentioning

confidence: 98%

Stipular colleters in Psychotria nuda (Cham. & Schltdl.) Wawra (Rubiaceae): micromorphology, anatomy and cristals microanalysis

2009

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RESUMO -(Coléteres Estipulares em Psychotria nuda (Cham. & Schltdl.) Wawra (Rubiaceae): micromorfologia, anatomia e microanálise dos cristais). Coléteres são estruturas secretoras, com função protetora, que podem ocorrer em diferentes órgãos e em diversas famílias de Angiospermae. Esse trabalho teve como objetivo descrever a anatomia e micromorfologia dos coléteres estipulares presentes em Psychotria nuda (Cham. & Schltdl.) Wawra bem como analisar a estrutura e composição dos cristais do eixo central da estrutura em questão. O material foi coletado na Reserva Biológica de Tinguá e processado de acordo com técnicas básicas de microscopia óptica e eletrônica de varredura. Os coléteres de P. nuda são do tipo lacrimiforme, constituídos por um eixo central alongado, formado por parênquima fundamental, circundado por um estrato epidérmico em paliçada responsável pela secreção mucilaginosa. Cristais do tipo ráfi de foram observados no eixo central dos coléteres. Através de microanálise de raio-X foi possível mostrar a presença predominante de cálcio nessas estruturas. Palavras-chave: cristais de oxalato de cálcio, coléteres, estrutura secretora, Rubiaceae ABSTRACT -(Stipular colleters in Psychotria nuda (Cham. & Schltdl.) Wawra (Rubiaceae): micromorphology, anatomy and crystal microanalysis). Colleters are secretory structures, with a protective function, that occur in different organs and in many Angiospermae families. The aim of this work was to describe the anatomy and micromorphology of colleters present in Psychotria nuda (Cham. & Schltdl.) Wawra as well as analyze the structure and composition of crystals from the central axis of the structure under study. The material was collected at the Tinguá Biological Reserve and processed according to usual techniques for light and scanning electron microscopy. The colleters are of the lachrymiform type, with an elongated central axis, formed by fundamental parenchyma, sheathed by a palisade layer, responsible for the secretion. Raphid crystals were observed in the central axis of the colleters. By X-ray microanalysis it was possible to show calcium predominance in these structures.

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“…De acordo com Th omas (1991), além da protoderme, células do meristema fundamental e do procâmbio podem estar envolvidas na formação de coléteres, sendo mais raros aqueles originados exclusivamente de células protodérmicas. Coléteres com origem mista foram descritos por Da Cunha & Vieira (1997), Klein et al (2004), Barreiro & Machado (2007) para espécies de Rubiaceae e por Appezzato-da-Glória & Estelita (2000) para espécies de Apocynaceae. Coléteres com origem exclusivamente protodérmica foram registrados por Paiva & Machado (2006a) em Hymenaea stigonocarpa (Fabaceae) e por Paiva & Martins (2011).…”

Section: Discussionunclassified

“…As referidas substâncias são comumente relatadas como fazendo parte da secreção produzida por coléteres de diferentes taxa (Kronestedt-Robards & Robards 1991; Th omas 1991; Appezzatoda-Glória & Estelita 2000; Rio et al 2002;Klein et al 2004;Paiva & Machado 2006a,b;Barreiro & Machado 2007), sendo geralmente a mucilagem o principal componente da secreção, conforme registrado nos coléteres de H. pernambucensis.…”

Section: Discussionunclassified

“…Klein et al (2004) detectaram, além de carboidratos, a presença de proteínas na secreção dos coléteres de Simira glaziovii (Rubiaceae), as quais possivelmente estão associadas com mecanismo de defesa contra microorganismos. A presença de substâncias lipofílicas na mucilagem é geralmente associada com a proteção contra herbívoros e patógenos além de impermeabilização da superfície de órgãos jovens (Werker & Fahn 1981;Ascensão et al 1995;Corsi & Bottega 1999).…”

Section: Discussionunclassified

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Estruturas secretoras de mucilagem em Hibiscus pernambucensis Arruda (Malvaceae): distribuição, caracterização morfoanatômica e histoquímica

2011

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ABSTRACT(Mucilage-secreting structures of Hibiscus pernambucensis Arruda (Malvaceae): distribution, morphoanatomical and histochemical characterization). This work studied the mucilage-secreting structures of Hibiscus pernambucensis using light and scanning electron microscopy. Known as guaxima-do-mangue, algodão-do-brejo and embira-do-mangue, this species is a native shrub that occurs in mangrove and restinga along the Brazilian coast, and is important in the production of textile fibers and cellulose, provides abundant mucilage that is used medicinally like other Malvaceae species, and has tannins. The results of this work found colleters, pearl glands, long-stalked secretory trichomes, ducts, cavities and idioblasts. The colleters occur on the shoot apices, stipules, leaf primordia, leaves, young sepals and petals. The pearl glands are present in the adaxial and abaxial surface of the leaf primordia. The ducts and the cavities occur in the vegetative and reproductive shoot apices. The idioblasts occur in the roots, both in primary and secondary stages of development, and in the leaf mesophyll. The secretion of the different secretory structures is made predominantly of acids and neutral polysaccharides, proteins, lipids and phenolic substances. The presence of external and internal mucilage-secreting structures in all plant organs, at different stages of development, represents an important adaptive mechanism to restinga and mangrove environments.

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The Structure of Colleters in Several Species of Simira (Rubiaceae)

Abstract: Few ultrastructural differences were noted among the three species. These secretory structures not only protect the shoot apex, but also have taxonomic importance below the genus level.

Cited by 99 publications

References 33 publications

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications

Stipular colleters in Psychotria nuda (Cham. & Schltdl.) Wawra (Rubiaceae): micromorphology, anatomy and cristals microanalysis

Estruturas secretoras de mucilagem em Hibiscus pernambucensis Arruda (Malvaceae): distribuição, caracterização morfoanatômica e histoquímica

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