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

Angulo, Maria Betiana; Dematteis, Massimiliano

doi:10.1080/00173130903435192

Cited by 30 publications

(17 citation statements)

References 17 publications

(29 reference statements)

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“…Rob., which present x = 9 and are not related to Chrysolaena (Dematteis & Robinson 1997;Dematteis & Salgado 2001). These two genera have triporate pollen grains, clearly differing from Chrysolaena, which always shows tricolporate grains (Keeley & Robinson 2009;Angulo & Dematteis 2010).…”

Section: Discussionmentioning

confidence: 99%

Chromosome number, meiotic behavior and pollen fertility of six species ofChrysolaena(Vernonieae, Asteraceae)

Pico

Dematteis

2012

Caryologia

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bFacultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, ArgentinaChromosome number, meiotic behavior and pollen fertility were determined for six species of the genus Chrysolaena H. Rob. (Vernonieae, Asteraceae). All the species had a base chromosome number of x = 10, with somatic numbers that ranged between 2n = 20 and 2n = 60. The chromosome number of Chrysolaena obovata (Less.) Dematt. (2n = 4x = 40) and a new cytotype for C. lithospermifolia (Hieron.) H.Rob. (2n = 4x = 40) are reported for the first time. Normal meiotic behavior was observed for the diploid species C. platensis (Spreng.) H. Rob., C. propinqua (Hieron.) H. Rob. and C. flexuosa (Sims) H. Rob. However, the polyploid taxa C. obovata, C. lithospermifolia (tetraploid) and C. cognata (Less.) Dematt. (hexaploid) showed many meiotic irregularities such as multivalent formation, chromosomes outside plate, early segregation of chromosomes, laggards and bridges in anaphase and telophase. Pollen fertility was high in all species, however, including in the polyploids. Polyploidy is more common in Chrysolaena than in any other New World Vernonieae so far reported and appears to be an important factor in the evolution of this genus.

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Section: Discussionmentioning

confidence: 99%

Chromosome number, meiotic behavior and pollen fertility of six species ofChrysolaena(Vernonieae, Asteraceae)

Pico

Dematteis

2012

Caryologia

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“…In Lessingianthus H. Rob., the species with high ploidy levels always has large pollen grains (Dematteis and Pire 2008;Angulo and Dematteis 2010). In Vernonia this relationship has not been examined, however in Vernonanthura the pollen size of the diploid taxa seems to be similar to the tetraploid species.…”

Section: Discussionmentioning

confidence: 99%

Chromosome studies of some species ofVernonanthuraandVernonia(Asteraceae, Vernonieae)

Vega

Dematteis

2012

Caryologia

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The chromosome numbers of 18 populations belonging to 10 species of Vernonanthura H. Rob. and one species of Vernonia Schreb. (Vernonieae, Asteraceae) from South America were determined. Vernonia echioides (n = 34) are in agreement with previous records for these species. All the species of Vernonanthura and Vernonia analyzed here showed basic number x 2 = 17 and almost all them were diploid with 2n = 34. The single exception was Vernonia echioides which showed diploid (2n = 34) and tetraploid (2n = 68) populations.

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“…Th e present study clearly demonstrates that the pollen morphology is taxonomically uninformative at the specifi c level for the genus Eremanthus and probably to a certain degree at the generic level in the subtribe Lychnophorinae. Th erefore, the general idea that pollen morphology is signifi cant in delimitating at specifi c and generic levels into the entire tribe Vernonieae (Angulo & Dematteis 2010) has to be rectifi ed; the situation in some groups (especially the Lepidaploa complex) could not be used as a general rule in the tribe.…”

Section: Discussionmentioning

confidence: 99%

“…Using mainly the classifi cation of Keeley and Jones, several authors have analysed and described pollen grains of Vernonieae, mostly of Vernonia s.l. (Keeley & Jones 1977, 1979Jones 1979Jones , 1981Robinson 1987aRobinson ,b,c, 1988aRobinson ,b,c, 1990Skvarla et al 2005;Mendonça & Gonçalves-Esteves 2000;Mendonça et al 2007aMendonça et al ,b,c, 2009Mendonça et al , 2010Dematteis & Pire 2008;Angulo & Dematteis 2010).…”

Section: Introductionmentioning

confidence: 99%

Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)

et al. 2012

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ABSTRACT(Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)). In order to evaluate the signifi cance 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. Th e variation among quantitative characters does not correlate with the macromorphological subdivision of the genus or with the generic or specifi c limits.

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

Cited by 30 publications

References 17 publications

Chromosome number, meiotic behavior and pollen fertility of six species ofChrysolaena(Vernonieae, Asteraceae)

Chromosome number, meiotic behavior and pollen fertility of six species ofChrysolaena(Vernonieae, Asteraceae)

Chromosome studies of some species ofVernonanthuraandVernonia(Asteraceae, Vernonieae)

Pollen morphology of the genus Eremanthus Less. (Vernonieae, Asteraceae)

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