Consulta: subjectFacets:"Secretory structures"
Registros recuperados: 14
Data/hora: 03/06/2024 11:52:45

Leaf and calycine colleters in Odontadenia lutea (Apocynaceae - Apocynoideae - Odontadenieae): their structure and histochemistry
Provedor de dados: Revista Brasileira de Botânica
Autores: Martins,Fabiano Machado.
The structure and histochemistry of colleters found on the vegetative and floral apices of Odontadenia lutea are described. Colleters occur on vegetative apices starting at the fourth node, with 68 to 80 colleters being found at each node. Each leaf primordium has only one colleter of axillary origin, 3-5 intra-petiolar, and 12-16 inter-petiolar (intra-stipular). There are four types of colleters: standard, bipartite standard, sessile, and bipartite sessile. Colleters on the reproductive apices alternate with the sepals and are sessile, reduced sessile, tripartite laminar sessile, or asymmetrical. All of the colleters have a central nucleus of parenchymatous cells covered by a palisade uniseriate secretory epidermis and a thin cuticle. Secretory idioblasts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mucilage; Phenolic compounds; Secretory structures.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042012000100007

Utilização de estruturas secretoras na identificação dos gêneros de Asteraceae de uma vegetação de cerrado
Provedor de dados: Revista Brasileira de Botânica
Autores: Castro,Marília de Moraes; Leitão-Filho,Hermógenes de Freitas; Monteiro,Walkyria Rossi.
(Utilização de estruturas secretoras na identificação dos gêneros de Asteraceae de uma vegetação de cerrado). Com o objetivo de se verificar o possível valor taxonômico das estruturas secretoras para espécies de Asteraceae, foi efetuado um levantamento de tipos destas estruturas em folhas de 72 representantes da referida família, que compõem parte da vegetação do cerrado da Reserva Biológica de Moji Guaçu (São Paulo, Brasil). As folhas foram selecionadas e tratadas segundo as técnicas usuais empregadas para materiais herborizados; a região mediana destas peças foi cortada a mão livre, enquanto que folhas inteiras foram diafanizadas e coradas. O levantamento evidenciou ductos, idioblastos, hidatódios e l0 diferentes tipos de tricomas secretores. Avaliados...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asteraceae; Secretory structures; Leaf; Cerrado vegetation.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041997000200007

Structure and distribution of glandular trichomes in three species of Bignoniaceae
Provedor de dados: Acta Amazonica
Autores: FRÓES,Fabíola Fernandes Paiva de Castro; GAMA,Thália do Socorro Serra; FEIO,Ana Carla; DEMARCO,Diego; AGUIAR-DIAS,Ana Cristina Andrade de.
Glandular trichomes play a major role in the morphological characterization of the Bignoniaceae. Due to their great diversity of forms and functions, this study aimed to inventory the glandular trichomes present in the aerial vegetative axis of Amphilophium magnoliifolium, Martinella obovata and Stizophyllum riparium, analyze their structure and register the participation of ants in these plants. Fresh samples from the nodal region, petiole and from medium to apical regions of the leaflet blade were fixed and processed according to usual methods in light and scanning electron microscopies. The glandular trichomes found were: peltate, capitate, stipitate, and patelliform/cupular. Peltate trichomes are the most abundant ones and present the most uniform...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bignonieae; Nectaries; Secretory structures; Stipitate trichome.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672015000400347

Colleters in Chamaecrista (L.) Moench sect. Chamaecrista and sect. Caliciopsis (Leguminosae-Caesalpinioideae): anatomy and taxonomic implications
Provedor de dados: Acta Botanica Brasilica
Autores: Silva,Marinalva dos Santos; Coutinho,Ítalo Antônio Cotta; Araújo,Maicon Nascimento; Meira,Renata Maria Strozi Alves.
ABSTRACT The 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 significance. They 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 flowers of both sections were obtained from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colleter; Flower; Histochemical analysis; Leaf; Polysaccharides; Secretory structures; Taxonomy.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300382

Morphoanatomy of nectaries of Chamaecrista (L.) Moench sections Chamaecrista , Caliciopsis and Xerocalyx (Leguminosae: Caesalpinioideae)
Provedor de dados: Acta Botanica Brasilica
Autores: Silva,Marinalva dos Santos; Coutinho,Ítalo Antônio Cotta; Araújo,Maicon Nascimento; Meira,Renata Maria Strozi Alves.
ABSTRACT Nectaries are specialized structures that secrete nectar. Several species of Chamaecrista possess nectaries on the petiole, which have been shown to vary widely in morphology and the chemical nature of their secretion. However, a comprehensive investigation of the nectaries of the clade formed by sect. Chamaecrista, Caliciopsis and Xerocalyx has yet to be performed. Our study aimed to confirm whether or not the leaf glands of species of this clade are in fact nectaries, determine the chemical nature of their secretion and expand the morphoanatomical database on leaf nectaries in Chamaecrista with the intention of contributing to the taxonomy and phylogeny of the genus. Samples from herbarium and field-collected material were subjected to standard...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foliar glands; Histochemistry; Leaf glands; Secretory structures; Taxonomy.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300445

Floral glands in asclepiads: structure, diversity and evolution
Provedor de dados: Acta Botanica Brasilica
Autores: Demarco,Diego.
ABSTRACT Species of Apocynaceae stand out among angiosperms in having very complex flowers, especially those of asclepiads, which belong to the most derived subfamily (Asclepiadoideae). These flowers are known to represent the highest degree of floral synorganization of the eudicots, and are comparable only to orchids. This morphological complexity may also be understood by observing their glands. Asclepiads have several protective and nuptial secretory structures. Their highly specific and specialized pollination systems are associated with the great diversity of glands found in their flowers. This review gathers data regarding all types of floral glands described for asclepiads and adds three new types (glandular trichome, secretory idioblast and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Apocynaceae; Asclepiadoideae; Diversity; Evolution; Flower; Secretory structures.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300477

A new glandular Mimosa species from Southern Brazil and insights about its glandular trichomes micromorphology
Provedor de dados: Acta Botanica Brasilica
Autores: Silveira,Fernanda Schmidt; Vargas,Wanderleia de; Fortuna-Perez,Ana Paula; Miotto,Silvia Teresinha Sfoggia.
ABSTRACT Mimosa baptistae is a new species presenting stalked glandular trichomes that give it a glutinous appearance, mainly with respect to the leaflets. Furthermore, it is an aculeate species, with multijugate leaves, white stamens, and fruits also covered by glandular trichomes. A herbaria survey and fieldwork only recorded this species as occurring on sandstone outcrops of the city Caçapava do Sul, Brazil. The species may be confused with other species of Mimosa sect. Batocaulon ser. Stipellares such as M. bifurca, M. sobralii and M. lepidota. However, features such as absence/presence of aculei, stamens color, habitat, and flower features are useful for distinguishing them from the new species. Here, we provide notes on morphology, geographic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glands; Leaflets; Pampa; Secretory structures; Serra do Sudeste.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000400716

A study of the morphoanatomical characters of the leaves of Chamaecrista (L.) Moench sect. Apoucouita (Leguminosae-Caesalpinioideae)
Provedor de dados: Acta Botanica Brasilica
Autores: Coutinho,Ítalo Antônio Cotta; Rando,Juliana Gastaldello; Conceição,Adilva de Souza; Meira,Renata Maria Strozi Alves.
ABSTRACT Little attention has been paid to species of Chamaecrista sect. Apoucouita (Leguminosae-Caesalpinioideae), especially regarding anatomical studies. When only vegetative material is available, the identification of such species may be difficult. Additionally, vegetative material of some species of C. sect. Apoucouita may be even harder to identify because they can resemble species of Inga Mill. (Leguminosae-Mimosoideae). The present study focused on recognizing morphoanatomical characters of leaves that are taxonomically useful for the species of C. sect. Apoucouita by employing standard anatomical techniques. The arrangement of the vascular system in the petiole/rachis, dorsiventral mesophyll, mucilage idioblasts in the epidermis of leaflets and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazon Rainforest; Applied botany; Atlantic Forest; Extrafloral nectaries; Papillae; Secretory idioblasts; Secretory structures; Taxonomy.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000200205

Are stem nectaries common in Gentianaceae Juss.?
Provedor de dados: Acta Botanica Brasilica
Autores: Dalvi,Valdnéa Casagrande; Meira,Renata Maria Strozi Alves; Azevedo,Aristéa Alves.
ABSTRACT Extrafloral nectaries (EFNs) are specialized structures that produce and release nectar and are located on leaves, cotyledons and, more seldomly, stems. Peculiar leaf nectaries have been described for thirty-three Neotropical species of Gentianaceae, while stem nectaries have been reported for only nine. The aim of this study was to verify the occurrence of stem EFNs within Gentianaceae and investigate the existence of a correlation between their occurrence and the geographical distribution of species. Samples of internodal regions from field and herbarium specimens were submitted to standard light microscopy techniques. Data regarding the geographical distribution of species were acquired from herbarium specimens and the literature. A total of 37...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coutoubeinae; Helieae; Potalieae; Saccifolieae; Secretory structures.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300403

Outer cell wall structure and the secretion mechanism of colleters of Bathysa nicholsonii K. Schum. (Rubiaceae)
Provedor de dados: Acta Botanica Brasilica
Autores: Miguel,Emilio de Castro; Pireda,Saulo; Barros,Claudia Franca; Zottich,Umberto; Gomes,Valdirene Moreira; Miguens,Flavio Costa; Cunha,Maura Da.
ABSTRACT Secretory structures are formed by many types of plants and are present on numerous different organs. Among the many types of known secretory structures, colleters are predominant on plants of the Rubiaceae. One remarkable characteristic of secretory tissues is the export of exudates; however, the precise mechanism involved in this process is still unclear. To better understand the mechanisms of exudate externalization it is necessary to understand the ultrastructure and dynamics of the outer cell wall of the secretory structures during the secretory process, and so we investigated these aspects of the colleters of Bathysa nicholsonii. The outer cell wall (OCW) exhibits multiple layers: a basal polysaccharide rich layer; a cuticular membrane,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colleters; Outer cell wall; Rubiaceae; Secretion accumulation site; Secretion mechanism; Secretory structures; Secretory tissues.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300411

Transfer cells in trichomatous nectary in Adenocalymma magnificum (Bignoniaceae)
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: GAMA,THÁLIA S.S.; AGUIAR-DIAS,ANA CRISTINA A. DE; DEMARCO,DIEGO.
ABSTRACT Transfer cells are specialized cells that play an important role where there are high energy costs due to facilitation of transmembrane flow of solutes. This study aimed to investigate the ontogenesis, histochemistry and ultrastructure of glandular trichomes focusing on stalk cells and their possible transfer function. Samples of prophylls of axillary buds, calyces of flowers in anthesis, and flower buds in different stages of development were collected, fixed and processed according to the common methods of microscopy. The glandular trichomes are composed of a secretory head with its cells in columnar format. The stalk is formed by two layers of cells, with the upper layer composed of cuboidal cells where the wall starts to thicken at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glandular trichomes; Nectaries; Ontogenesis; Secretory structures; Wall ingrowths.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000200527

Anatomy and fructan distribution in vegetative organs of Dimerostemma vestitum (Asteraceae) from the campos rupestres
Provedor de dados: Anais da Academia Brasileira de Ciências
Autores: Silva,Taiza M.; Vilhalva,Divina A.A.; Moraes,Moemy G.; Figueiredo-Ribeiro,Rita de Cássia L.
Among the compounds stored by plants, several functions are assigned to fructans, such as source of energy and protection against drought and extreme temperatures. In the present study we analyzed the anatomy and distribution of fructans in vegetative organs of Dimerostemma vestitum (Asteraceae), an endemic species from the Brazilian campos rupestres. D. vestitum has amphistomatic and pubescent leaves, with both glandular and non-glandular trichomes. In the basal aerial stem the medulla has two types of parenchyma, which differ from the apical portion. The xylopodium has mixed anatomical origin. Interestingly, although inulin-type fructans with high degree of polymerization were found in all analyzed organs except the leaves, the highest amount and maximum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Campo rupestre; Fructans; Inulin spherocrystals; Secretory structures; Xylopodium.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200797

Comparative leaf morphology and anatomy of three Asteraceae species
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Milan,Patricia; Hayashi,Adriana Hissae; Appezzato-da-Glória,Beatriz.
The objective of this paper was to describe and compare the morphology and anatomy of mature leaves of Mikania glomerata Spreng., Porophyllum ruderale Cass. and Vernonia condensata Baker (Asteraceae) species that have different habits emphasizing their secretory structures. Longitudinal and transversal sections of mature leaf blades of the three species were analyzed at the apex, base, and medium third part of the midvein of the leaf blade and of the margin. M. glomerata had uniseriate glandular trichomes and secretory ducts; P. ruderale had hydathodes and secretory cavities; and V. condensata had idioblasts and uni-and biseriate glandular trichomes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mikania glomerata; Porophyllum ruderale; Vernonia condensata; Secretory structures; Medicinal plants.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100016

Drying temperature changes trichome integrity, chemical content and composition of the essential oil of pepper-rosmarin
Provedor de dados: Ciência Rural
Autores: Queiroz,Giovanna Alcântara; Silva,Pedro Henrique Lopes; Oliveira,Rosilene Aparecida de; Sodré,George Andrade; Costa,Larissa Corrêa do Bomfim.
ABSTRACT:  Medicinal plants are generally commercialized dried. However, temperatures used in their drying processes may interfere with the content and chemical composition of their essential oils. The Lippia origanoides possesses thymol in the essential oil that is stored in glandular trichomes. Thymol is a major component of economic importance in the chemical and pharmaceutical industry. The objective of this study was to evaluate the effect of the drying temperatures of L. origanoides leaves regarding trichome integrity, content, and chemical composition of the essential oil. The experimental design was completely randomized with four treatments defined by oven drying temperatures (40, 50, 60, and 70ºC) and four replications. Essential oil was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lippia origanoides; Medicinal plant; Secretory structures; Drying; Thymol.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100404