Histochemistry and Senescence of Colleters of Allamanda cathartica (Apocynaceae)

Thomas, Vinoth; Dave, Yash

doi:10.1093/oxfordjournals.aob.a087826

Cited by 54 publications

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“…In C. brasiliense, proteins in colleter secretion were only detected qualitatively; however, the intensity of the reaction suggests that the quantity is small, with a possible enzymatic function. The presence of proteins in colleter secretion has also been reported by several authors (Horner & Lersten, 1968;Mohan & Inandar, 1986;Thomas & Dave, 1989); however, their function in protecting meristem apices still requires study.…”

Section: Discussionmentioning

confidence: 55%

“…Lipid compounds present in colleter secretion, as in C. brasiliense, are common in colleters (Mohan & Inandar, 1986;Thomas & Dave, 1989;Appezzato-da-Glória & Estelita, 2000). In C. brasiliense, proteins in colleter secretion were only detected qualitatively; however, the intensity of the reaction suggests that the quantity is small, with a possible enzymatic function.…”

Section: Discussionmentioning

confidence: 99%

“…The developing meristem is completely covered with colleter exudate which protects it (Thomas & Dave, 1989;Thomas, 1991). According to Dickison (2000), colleters are multicellular appendices or trichomes which produce a sticky secretion.…”

Section: Introductionmentioning

confidence: 99%

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Colleters in Caryocar brasiliense (Caryocaraceae) ontogenesis, ultrastructure and secretion

Paiva

Machado

2006

Braz. J. Biol.

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Colleters are widely distributed and have been reported in several taxa. However, the only report of colleters in the Caryocaraceae family is in Caryocar brasiliense. This study purports to describe the distribution, structure and ultrastructure of colleters in C. brasiliense. Vegetative shoot apices with stipules in different stages of development were collected, fixed, and processed by light, transmission and scanning electron microscopy. Colleters occur on the stipule adaxial face and are differentiated on younger stipules, remaining functional until senescence. Stipules are deciduous, falling before the beginning of leaf expansion. Colleter secretion is abundant, filling all the space delimited by the stipule. Colleter origin is mixed, involving the protoderm and ground meristem. In this species, colleters are finger-shaped, consisting of a column of non-secretory central cells and a secretory epithelium whose cells are arranged in palisades. Secretory epithelium cells show dense cytoplasm, rough endoplasmic reticulum (RER) segments, free ribosomes, mitochondria, and abundant well developed dictyosomes. The colleters central cell shows a flocculated cytoplasm and developed vacuole. These cells have a small lobated nucleus with an inconspicuous nucleolus. Mitochondria and RER stand out in the organelles. There is evidence of granulocrine secretion and colleter involvement with protection of the apical meristem and leaves in the initial stages of development.Keywords: Caryocaraceae, cerrado vegetation, colleter, pequi, secretion. RESUMOOntogênese, ultra-estrutura e secreção dos coléteres de Caryocar brasiliense Camb. (Caryocaraceae)Os coléteres são amplamente distribuídos, com registros de sua ocorrência em diversas taxas, entretanto há apenas um registro de sua ocorrência na família Caryocaraceae, à qual pertence Caryocar brasiliense. Com o objetivo de descrever a distribuição, estrutura e ultra-estrutura dos coléteres de C. brasiliense, amostras de ápices caulinares com estípulas em várias fases de desenvolvimento foram coletadas, fixadas e processadas para estudos em microscopia de luz e eletrônica de transmissão e varredura. Os coléteres ocorrem exclusivamente na face adaxial das estípulas e diferenciam-se nas estípulas mais jovens, mantendose funcionais até a senescência. As estípulas são caducas, caindo antes do início da expansão das folhas. A secreção dos coléteres é abundante, preenchendo todo o espaço delimitado pela estípula. A origem dos coléteres é mista, envolvendo a protoderme e o meristema fundamental, sendo, portanto, considerados como emergências e não tricomas. Nesta espécie, os coléteres são digitiformes, formados por uma coluna de células centrais, não secretoras e por um epitélio secretor cujas células estão dispostas em paliçada. As células do epitélio secretor apresentam citoplasma denso, segmentos de retículo endoplasmático rugoso, ribossomos livres, mitocôndrias e abundância de dictiossomos, dos quais partem inúmeras vesículas possivelmente carregadas com produtos de secreção....

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Section: Discussionmentioning

confidence: 55%

Section: Discussionmentioning

confidence: 99%

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Colleters in Caryocar brasiliense (Caryocaraceae) ontogenesis, ultrastructure and secretion

Paiva

Machado

2006

Braz. J. Biol.

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“…Chamaecrista and Caliciopsis are indeed colleters. Such structures are typically related to the protection of young leaves and flowers from desiccation and attack from microorganisms since the secretion present is made of mucilage or a mixture of mucilage, resin and protein (Thomas & Dave 1989;Thomas 1991;Rocha et al 2009). …”

Section: Discussionmentioning

confidence: 99%

“…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). 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).…”

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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Comparative and phylogenetic significance of the colleters in the family Apocynaceae

Thomas

Dave

1991

Feddes Repertorium

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A comparative and phylogenetic significance of colleters of 19 members of the family Apocynaceae are studied on the basis of both morphological and anatomical features. Colleters are present on the adaxial side of petiole, bract, bracteole, calyx and corolla. In many members colleters are intermingled with petiolar hairs. Structurally a colleter consists of a central core of parenchyma cells surrounded by radially elongated epithelial cells. Besides the normal structure, unicellular epithelial hair, sub‐epidermal cells, vasculature and laticifer are also observed in the colleter tissue of various genera. It is considered that the colleters are multicellular secretory structures protecting the meristem.

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Histochemistry and Senescence of Colleters of Allamanda cathartica (Apocynaceae)

Cited by 54 publications

References 0 publications

Colleters in Caryocar brasiliense (Caryocaraceae) ontogenesis, ultrastructure and secretion

Colleters in Caryocar brasiliense (Caryocaraceae) ontogenesis, ultrastructure and secretion

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

Comparative and phylogenetic significance of the colleters in the family Apocynaceae

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