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

Machado, Sílvia Rodrigues; Barreiro, Daniela Pacheco; Rocha, Joecildo Francisco; Rodrigues, Tatiane Maria

doi:10.1016/j.flora.2012.09.013

Cited by 23 publications

(15 citation statements)

References 31 publications

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“…Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications may indicate that they play an important functional role in keeping young structures hydrated (Fahn & Cutler 1992). Lipids have been detected in the colleter secretion of species belong Apocynaceae (Appezzato-da-Glória & Estelita 2000), Leguminosae (Paiva 2009), Gentianaceae (Dalvi et al 2013), Orchidaceae (Mayer et al 2011) and Rubiaceae (Machado et al 2012;Tullii et al 2013). 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).…”

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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“…In addition, the presence of lipid bodies scattered in the cytoplasm and in the periplasmic space, also suggests the occurrence of an eccrine mechanism of secretion where the molecules pass the plasma membrane directly as a result of a concentration gradient or by an active transport (Fahn 1979;Evert 2006). In fact, in a same gland cell producing mixed secretions, polysaccharides and proteins collected in membrane bound vesicles are eliminated from the cytoplasm by exocytosis, typical of the granulocrine secretion, while oils and resin components are able to traverse the plasma membrane by the eccrine secretion (Rodrigues et al 2011;Machado et al 2012;Sá-Haiad et al 2015). Additionally, products of secretion can be transported by the endoplasmic reticulum, which is able to merge with the plasma membrane and release the secretion outside the protoplast (Fahn 1988 and literature therein).…”

Section: Discussionmentioning

confidence: 99%

Oil-resin glands in Velloziaceae flowers: structure, ontogenesis and secretion

et al. 2016

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Many Velloziaceae flowers present conspicuous glands, whose taxonomic value has already been highlighted. However, until now, their micromorphology, anatomy and ultrastructure have not been investigated, nor have the natures and possible functions of their exudates. Our aim was to investigate distribution, ontogenesis, structure, and secretion mechanisms of glands of Barbacenia flava and Vellozia intermedia and to discuss their possible ecological functions. Samples were prepared according to standard methods for investigations of plant anatomy, scanning electron microscopy, and transmission electron microscopy. Histochemical tests were performed, and focal field observations were made in the study site. The capitate stalked glands on the pedicel, tepals and hypanthium are covered by a sticky secretion that is released in the gland head through the outer periclinal cell walls and cuticle. Secretions are produced in the epidermal and subepidermal cells that contain structural components typical of mixed, mainly lipophilic secretions. Bacteria were found inside the oil-resin gland cells of both species. The Meliponina bees Trigona spinipes and Tetragonisca angustula were observed collecting resin from both species, but were not involved in pollination. Our observations clearly indicate that flower glands of B. flava and V. intermedia are oil-resin secreting and remain active in secretion from very young buds, through to immature fruit. New, smaller glands replace senescent glands by divisions near the base of the original stalk cells. Oil-resin glands have a number of different, but important functions, including the interaction with Meliponina bees, protection against water loss and high temperatures by ultraviolet screening, and anti-desiccant properties.

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“…The secretion of colleters is mostly composed of mucilage (Fahn 1979;Thomas 1991;da Silva et al 2012) or a mixture of mucilage and terpenes and (or) resin (Fahn 1979;Subramanian et al 1989;Mangalan et al 1990;Barreiro and Machado 2007). However, other chemical compounds have been identified in the exudate as proteins in Apocynaceae (Dave et al 1987; Thomas et al 1989), Aquifoliaceae (González and Tarragó 2009), Orchidaceae (Mayer et al 2011), and Rubiaceae (Thomas and Dave 1990;Klein et al 2004;de Castro Miguel et al 2006); phenolic compounds in Apocynaceae (Martins 2012), and lipids in Apocynaceae (Appezzato-da-Glória and Estelita 2000), Fabaceae (Paiva 2009), Orchidaceae (Mayer et al 2011), and Rubiaceae (Machado et al 2012). Although the presence of various metabolites, in addition to mucilage, has been demonstrated in the colleter exudate of several species, no correlation between different chemical constitutions and taxonomic groups has been observed.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of colleters is one of the synapomorphic characteristics of the order Gentianales, which includes the families Gentianaceae, Apocynaceae, Gelsemiaceae, Loganiaceae, and Rubiaceae . Many studies on types of colleters were performed with representatives from the Gentianales, especially from the Apocynaceae (Dave et al 1988;Thomas and Dave 1989b;Simões et al 2004;Martins et al 2010, Martins 2012 and Rubiaceae (Lersten 1975;Thomas 1991;Barreiro and Machado 2007;Machado et al 2012). Calycine colleters have been reported in different genera of Gentianaceae (Renobales et al 2001;Mészaros et al 2002;; however, reports of the presence of foliar colleters and studies of the anatomy and chemical nature of the secretion are scarce and restricted to species of the genera Gentiana L., Gentianella Moench, Gentianopsis Ma, Comastoma Toyok., Swertia L. (Renobales et al 2001), Calolisianthus Gilg (Delgado et al 2011), and Curtia Cham.…”

Section: Introductionmentioning

confidence: 99%

Foliar colleters inMacrocarpaea obtusifolia(Gentianaceae): anatomy, ontogeny, and secretion

Dalvi

Cardinelli

Meira

et al. 2014

Botany

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Colleters are secretory structures located in reproductive and (or) vegetative organs of many eudicots. In Gentianaceae Juss., the presence of foliar colleters has been neglected, and anatomical and histochemical studies are scarce. The objectives of this study were to investigate the anatomy, ontogeny, and chemical nature of the secretion found in Macrocarpaea obtusifolia (Griseb.) Gilg colleters to establish a relationship between their structure and function and check whether these structures are similar to those described for other genera of the Gentianaceae and other families of the Gentianales. Samples of leaves at different developmental stages were collected and processed for anatomical and histochemical analysis using light microscopy and scanning electron microscopy. Colleters in M. obtusifolia have a protodermal origin, are of standard type, and are not vascularized. Young colleters are translucent and produce an abundant amount of sticky secretion. Later, they turn yellowish with a blackened region at the apex of the head, and the secretion, composed of polysaccharides and proteins, becomes less abundant and brownish. During senescence, the process begins with complete degradation and cell collapse of the secretory portion. The colleters of the standard type in M. obtusifolia have been observed for the first time in the Gentianaceae and represent additional evidence that reinforces how common this type of colleter is in the Gentianales. Such results provide new information on the anatomy, ontogeny, histochemistry, and colleter types of Gentianaceae.Key words: micromorphology, mucilage, proteins, secretory structures. Résumé :Les collerettes constituent des structures sécrétrices localisées dans les organes reproducteurs ou végétatifs de plusieurs eudicotylées. Chez les Gentianaceae, on a négligé la présence de collerettes foliaires; en effet, rares sont les études anatomiques et histochimiques. L'objectif des auteurs était d'examiner l'anatomie, l'ontogénie, et la nature chimique de la sécrétion se retrouvant dans les collerettes du Macrocarpaea obtusifolia (Griseb.) Gilg, afin d'établir la relation entre leur structure et leur fonction et de vérifier si ces structures sont semblables à celles décrites chez d'autres genres de Gentianaceae et d'autres familles des Gentianales. Ils ont récolté des échantillons de feuilles à divers stades de développement et effectué des analyses anatomiques et histochimiques à l'aide de la microscopie photonique et à électronique par balayage. Chez le M. obtusifolia, les collerettes ont une origine protodermique, sont de type standard et non vascularisées. Les jeunes collerettes translucides produisent une bonne quantité de sécrétion collante. Plus tard, elles deviennent jaunes avec une région à col noir à l'apex de la tête et la sécrétion, composée de polysaccharides et de protéines, devient moins abondante et brunit. Pendant la sénescence, le processus débute avec une dégradation complète avec un affaissement des cellules de la portion sécrétrice. On a obse...

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

Cited by 23 publications

References 31 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

Oil-resin glands in Velloziaceae flowers: structure, ontogenesis and secretion

Foliar colleters inMacrocarpaea obtusifolia(Gentianaceae): anatomy, ontogeny, and secretion

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