Pollen morphology and classification of the<i>Vernonieae</i>(<i>Compositae</i>)

Bolick, M. R.; Keeley, Sterling C.

doi:10.1080/12538078.1994.10515159

Cited by 11 publications

(7 citation statements)

References 32 publications

(27 reference statements)

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“…4 differs from the "B" pollen, because the abporal and poral lacunae are not completely separated by lophae. This pollen type is restricted to New World species and it is specially represented in some taxa of Lepidaploa, a genus closely related to Lessingianthus (Robinson, 1988a;Bolick & Keeley, 1994). Although L. cristalinae shows almost all the typical morphological features of Lessingianthus, a possible relationship with some species of Lepidaploa with pollen type "D" should be analysed.…”

Section: Discussionmentioning

confidence: 99%

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Pollen morphology of the South American genus Lessingianthus (Vernonieae, Asteraceae) and its taxonomic implications

Angulo

Dematteis

2010

Grana

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Section: Discussionmentioning

confidence: 99%

“…Pollen morphology is one of the characters, other than style bases and anther appendages, that is useful in delineating natural groups in the Vernonieae (Robinson, 1992a;Bolick & Keeley, 1994). Several authors have analysed the pollen grains of species of the tribe, mainly belonging to the genus Vernonia s.l.…”

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confidence: 99%

Pollen morphology of the South American genus Lessingianthus (Vernonieae, Asteraceae) and its taxonomic implications

Angulo

Dematteis

2010

Grana

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“…Within the tribe Vernonieae, the subtribe Elephantopinae is consistently recognized on the basis of the clustered heads, the corollas often zigomorphic, the tendency for a reduced or modified pappus, and the echinolophate and usually triporate pollen (Robinson 1999). Several studies have revealed that the pollen morphology is one of the most useful features for the taxonomy in the tribe Vernonieae (e.g., Kingham 1975;Blackmore 1986;Jeffrey 1988;Bolick and Keeley 1994;Keeley and Robinson 2009;Robinson 1999;Blackmore et al 2009). However, the pollen studies in the subtribe Elephantopinae are scattered.…”

Section: Introductionmentioning

confidence: 97%

Palynological survey of the subtribe Elephantopinae (Asteraceae, Vernonieae)

Tellerı́a

2012

Plant Syst Evol

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Despite the taxonomic value of pollen morphology within the tribe Vernonieae, a detailed study of the pollen of the subtribe Elephantopinae is still lacking. The pollen morphology of ten species, representing three of the four genera of the subtribe, Elephantopus, Pseudoelephantopus and Orthopappus, was studied with LM, SEM, and TEM. The pollen of all the species studied was found to be echinolophate, although the differences in aperture features and both sculpture and exine structure allowed recognizing two pollen types. The species of Elephantopus (except for E. elongatus) and Pseudoelephantopus share the regular or more or less regular ridges pattern, the colporate condition but with the ectoapertures little developed, and the acaveate exine structure. From the sculpture and the apertures, the pollen of Caatinganthus harleyi was found to be similar to that of Elephantopus and Pseudoelephantopus. The pollen morphology of the monotypic Orthopappus, which is shared with that of E. elongatus, was further investigated for the first time. We found that it differs from that of the other species in having an irregular pattern of ridges, colporate condition but with a welldeveloped ectoapertures, and caveate exine. Additional studies of the exine structure and apertures features, coupled with molecular phylogeny, are needed to understand the evolution of pollen characters and re-evaluate the intergeneric relationships within the tribe.

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“…Wodehouse (1935) foi o primeiro a reconhecer três padrões de ornamentação: psilado, equinado e lofado; Erdtman (1952) destacou a variabilidade na abertura, no tamanho, na forma e na ornamentação da exina; Stix (1960) criou 42 tipos polínicos para a família com base na estrutura da exina quando observada em microscopia de luz e eletrônica de transmissão. Outros autores como Skvarla & Turner (1966), Smith (1969), Moreira (1969), Salgado-Labouriau (1973), Nair & Lawrence (1985), Roubik & Moreno (1991), Skvarla et al (1977), Bolick & Keeley (1994), , Skvarla et al (2005) estudaram, palinologicamente, espécies de Asteraceae e, particularmente, de Vernonia, utilizando, ou não os tipos criados por Stix (1960). É importante frizar que a partir de 1966, surgiram publicações sobre os grãos de pólen de Vernonia onde os autores criaram diversos tipos polínicos com base naqueles de Stix (1960).…”

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Palinotaxonomia de espécies de Lepidaploa (Cass.) Cass. (Vernoniinae - Compositae) ocorrentes no Sudeste do Brasil

Mendonça¹,

Esteves²,

Gonçalves-Esteves³

2007

Rev. bras. Bot.

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-(Palynotaxonomy of species of Lepidaploa (Cass.) Cass. (Vernoniinae -Compositae) from southeastern Brazil). The pollinic study of 23 species of Lepidaploa that occur in southeastern Brazil was done with the objetive of contributing to the pollinic characterization of these species and also evaluating its taxonomic position. The pollen grains were acetolysed, measured, described and ilustrated under light microscopy. For further details of pollen surface and aperture, non acetolysed pollen grains were analysed by scanning electron microscopy (SEM) and, subsequently, electron-micrographed. Characteristics of pollen grains like shape, size and constitution of exine and aperture were studied. The pollen of the species analysed in this study varies from medium or large in size, isopolar, suboblate, oblate spheroidal or prolate spheroidal, subtriangular ambit, small or large polar area, 3-colporate with echinolophate surface. A key to identify the studied species was made based on pollinic data. Pollen grains from Lepidaploa have four main brochus organization pattern of the echinolophate exine. Three of these patterns can be divided into subtypes according to the apertural lacune shape.Key words -Compositae, Lepidaploa, palynology, southeast Brazil, Vernoniinae RESUMO -(Palinotaxonomia de espécies de Lepidaploa (Cass.) Cass. (Vernoniinae -Compositae) ocorrentes no Sudeste do Brasil). Foi realizado o estudo polínico de 23 espécies de Lepidaploa (Cass.) Cass. (Vernoniinae-Compositae) ocorrentes no Sudeste do Brasil, com o objetivo de contribuir para a caracterização polínica dessas espécies, bem como avaliar sua posição taxonômica. Os grãos de pólen foram acetolisados, medidos, descritos e ilustrados sob microscópia de luz. Para observar detalhes da superfície e da abertura, grãos de pólen não acetolizados foram analisados em microscópio eletrônico de varredura (MEV) e, em seguida, eletromicrografados. Foram estudadas as características dos grãos de pólen como forma, tamanho, constituição da exina e abertura. As espécies analisadas nesse estudo possuem grãos de pólen de tamanho médios ou grandes, isopolares, suboblatos, oblato-esferoidais ou prolato-esferoidais, âmbito subtriangular, área polar pequena ou grande, 3-colporados de superfície equinolofada. Foi confeccionada uma chave para identificação das espécies estudadas com base em dados polínicos. Pôde-se concluir que os grãos de pólen do gênero Lepidaploa apresentam quatro padrões principais de organização das malhas da exina equinolofada e três desses padrões podem ser divididos em subtipos de acordo com a forma da lacuna apertural.

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Pollen morphology and classification of theVernonieae(Compositae)

Cited by 11 publications

References 32 publications

Pollen morphology of the South American genus Lessingianthus (Vernonieae, Asteraceae) and its taxonomic implications

Pollen morphology of the South American genus Lessingianthus (Vernonieae, Asteraceae) and its taxonomic implications

Palynological survey of the subtribe Elephantopinae (Asteraceae, Vernonieae)

Palinotaxonomia de espécies de Lepidaploa (Cass.) Cass. (Vernoniinae - Compositae) ocorrentes no Sudeste do Brasil

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