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| Registros recuperados: 36 | |
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| Moreira,Giselle Lopes; Cavalcanti,Taciana Barbosa; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vânia. |
| Abstract There are nine species of the plant genus Verbesina in Brazil, which are distributed in the Northeast, Center-West, Southeast and South regions of the country. The objective of the present study was to describe the pollinic morphology of eight of these species to better characterize them and evaluate potential species-level taxonomic characters. Acetolysed pollen material was measured within seven days under light microscopy, while non-acetolyzsed pollen grains were used for scanning electronic microscopy. The pollen grains were found to be oblate-spheroidal, medium-sized, isopolar, monads that are 3-colporate with a subtriangular amb, a small polar area, a long colpus, a lalongate endoaperture, a caveate exine and an echinate sexine. Although the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Compositae; Heliantheae; Morphology; Pollen; Verbesina. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100128 |
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| Franca,Rafael de Oliveira; De-Paula,Orlando Cavalari; Carmo-Oliveira,Renata; Marzinek,Juliana. |
| Ageratum has a complex circumscription, and recent studies have indicated its polyphyletism. The genus has been placed in the tribe Eupatorieae whose embryology is not fully known. Embryological data are conservative and important indicators of phylogenetic relationships and can improve family relationships. This study presents, for the first time in Eupatorieae, embryological data for Ageratum conyzoides and A. fastigiatum. Both species have common features of the family such as a unitegmic anatropous ovule, basal placentation, secretory tapetum, Polygonum megagametophyte, and Asterad embryogenesis. The data obtained reinforce the heterogeneity of the family embryology and show, for the first time, the anther wall development of the monocotyledonous type... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compositae; Embryogenesis; Eupatorieae; Ontogeny; Phytomelanin. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000100008 |
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| Mendonça,Cláudia Barbieri Ferrreira; Souza,Mariana Albuquerque de; Gonçalves-Esteves,Vania; Esteves,Roberto Lourenço. |
| Realizou-se o estudo polínico de 11 espécies distribuídas em três gêneros, Chrysolaena H. Rob., Echinocoryne H. Rob. e Stenocephalum Sch. Bip., pertencentes à subtribo Vernoniinae, com o objetivo de contribuir para a caracterização polínica dessas espécies e avaliar sua posição taxonômica. Os grãos de pólen foram acetolisados, analisados e fotomicrografados sob microscopia de luz. Para observar detalhes da superfície e abertura, grãos de pólen não acetolisados foram analisados em microscópio eletrônico de varredura e de transmissão. Os gêneros foram separados, em uma chave palinológica, em dois grandes grupos utilizando-se o número total e a organização das lacunas que formam o padrão lofado. No primeiro grupo foram reunidas espécies de Echinocoryne H.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compositae; Palinologia; Taxonomia; Vernoniinae. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000300010 |
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| Ribeiro,Rogério Neves; Teles,Aristônio M.. |
| ABSTRACT Lessingianthus spinifolius is here described and illustrated as a new species of the tribe Vernonieae (Asteraceae) from Chapada dos Veadeiros, State of Goiás, Brazil. The new species is thus far known only from the type locality. The characteristics that most differentiate L. spinifolius from congeners are: (i) leaf blade strongly revolute; and (ii) leaf blade with spines on the margins. The new species is similar to L. onopordioides due to both having a similarly shaped involucre and the involucre being eximbricate with lanceolate phyllaries. Taxonomic and ecological comments, a distribution map, conservation status assessment, and illustrations of the new species are provided. Additionally, Vernonia araneosa is resurrected from the synonymy of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Compositae; Endemism; Lepidaploinae; Vernonia. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000400521 |
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| Hernández,Marcelo Paulo; Katinas,Liliana; Arambarri,Ana María. |
| In this paper we examine lipophilic substances, tannins, proteins, reducing carbohydrates, starch, and oxalate salts in early lineages of Asteraceae to test if they are a useful complement to classification studies. Styles of mature flowers of 44 species were processed according to plant histochemical techniques and observed by means of a light microscope. Lipophilic compounds were always present in the cuticle and cell walls, and in some species were located inside the cells. Proteins were located in the style cell walls and cell interior of most of the analyzed species. No tannins were found. In general, there is a correlation in the presence of reducing sugars and proteins. Starch granules and oxalate salts were found in the style parenchyma of a few... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compositae; Crystal salts; Lipophilic substances; Proteins; Starch; Sugars; Taxonomy. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062015000400575 |
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| Loeuille,BenoÎt; Souza-Souza,Raquel Maria Batista; Abreu,Vanessa Holanda Righetti; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vania. |
| In order to evaluate the significance of the pollen morphology for generic and infrageneric taxonomy of the genus Eremanthus (Vernonieae, Asteraceae), and to provide additional data for its phylogenetic reconstruction, the pollen of 20 of the 23 species of the genus was examined using light and scanning electron microscopy. Acetolysed pollen grains were measured, described, and illustrated using light microscopy, while non-acetolysed pollen grains were analyzed using scanning electron microscopy. Pollen grains of these species are isopolar, oblate-spheroidal in most of the species, more rarely prolate spheroidal or suboblate, subtriangular amb, tricolporate and subechinolophate. The variation among quantitative characters does not correlate with the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lychnophorinae; Compositae; Taxonomy; Palynology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000100006 |
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| WANG,CONGYAN; LIU,JUN; XIAO,HONGGUANG; ZHOU,JIAWEI; DU,DAOLIN. |
| ABSTRACT This study aims to determine the floristic characteristics of alien invasive seed plant species (AISPS) in China. There are a total of five hundred and thirteen AISPS, belonging to seventy families and two hundred and eighty-three genera. Seventy families were classified into nine areal types at the family level, and "Cosmopolitan" and "Pantropic" are the two main types. Two hundred and eighty-three genera were classified into twelve areal types at the genus level, and "Pantropic", "Trop. Asia & Amer. disjuncted", and "Cosmopolitan" are the three main types. These results reveal a certain degree of diversity among AISPS in China. The floristic characteristics at the family level exhibit strong pantropic characteristics. Two possible reasons... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alien invasive plant species; Floristic characteristics; China; Compositae. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000501791 |
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| Appezzato-da-Glória,Beatriz; Cury,Graziela. |
| In the Brazilian Cerrado (neotropical savanna), the development of bud-bearing underground systems as adaptive structures to fire and dry periods can comprise an important source of buds for this ecosystem, as already demonstrated in the Brazilian Campos grasslands and North American prairies. Asteraceae species from both woody and herbaceous strata have subterranean organs that accumulate carbohydrates, reinforcing the adaptive strategy of these plants to different environmental conditions. This study aims to analyse the morpho-anatomy of underground systems of six species of Asteraceae (Mikania cordifolia L.f. Willd., Mikania sessilifolia DC, Trixis nobilis (Vell.) Katinas, Pterocaulon alopecuroides (Lam.) DC., Vernonia elegans Gardner and Vernonia... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anatomy; Buds; Compositae; Fructans; Stem tuber; Xylopodium. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300017 |
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| Dematteis,Massimiliano. |
| El género Chrysolaena H. Rob. (Vernonieae, Asteraceae) se diferencia de los restantes miembros sudamericanos de la tribu por la presencia de indumento seríceo o velutino, anteras con apéndice apical glanduloso, estilo sin nódulo basal y cipselas glandulares. También se puede separar de otros grupos americanos por la morfología de los granos de polen y el número de cromosomas. Esta última es una de las diferencias más importantes, dado que Chrysolaena es el único miembro americano de la tribu con número básico x=10, un guarismo presente principalmente en las Vernonieae del Viejo Mundo. Hasta la actualidad, este género comprende 12 especies distribuidas principalmente en el sur de Brasil, Paraguay y nordeste de Argentina. En el presente trabajo se describen... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vernonia; Cromosomas; Morfología polínica; Compositae. |
| Ano: 2009 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722009000100011 |
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| KATINAS,LILIANA; CRISCI,JORGE V.; MARTICORENA,ALICIA. |
| Se describe e ilustra una nueva especie de Leucheria Lag. (Asteraceae, Nassauvieae), L. meladensis Katinas, Crisci & A.E. Martic, con hojas enteras, elípticas, pecioladas y levemente pubescentes. Esta sería la única especie endémica de la Reserva Nacional Bellotos del Melado, a los 35º S, en la provincia de Linares, región del Maule en Chile. Se presenta una clave de las especies que habitan la provincia de Linares. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compositae; Chile; Endemismo; Nassauvieae.. |
| Ano: 2018 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722018000100012 |
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| Magenta,Mara Angelina Galvão; Nunes,Alessandra De Deus; Mendonça,Cláudia Barbieri Ferreira; Gonçalves-Esteves,Vânia. |
| With the aim of improving inter-specific delimitation of the genus Viguiera Kunth in Brazil, a palynological analysis was undertaken with 27 taxa, representing around 77% of all occurring species. Samples were obtained from herbarium specimens and the pollen grains were analyzed through light and scanning electron microscopy. Characteristics, including the shape of the pollen grains, polar and equatorial diameter, aperture measurements, surface ornamentation and exine thickness, were registered and compared. The pollen grains were medium-sized (25 - 50 mm), isopolar and oblate spheroidal (prolate spheroidal in V. aspilioides Baker). The observed values corroborated the synonymity of some species and also highlighted certain micro-morphological differences,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asteraceae; Brazil; Compositae; Pollen; Taxonomy; Viguiera. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722010000200008 |
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| Registros recuperados: 36 | |
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