Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina

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Meiotic chromosome numbers were determined and observations of meiotic behavior were made in six species and two hybrid specimens of Senecio L. (Asteraceae). Two different numbers were found: 2n=4x=40 in S. pogonias Cabr., S. ragonesei Cabr., S. sectilis Griseb. and S. viridis Phil. var. radiatus R....

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Detalles Bibliográficos
Autores principales: López, Mariana C., Wulff, Arturo F., Xifreda, Cecilia Carmen
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123765
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123765
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
spellingShingle Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
López, Mariana C.
Wulff, Arturo F.
Xifreda, Cecilia Carmen
Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
topic_facet Botánica
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
description Meiotic chromosome numbers were determined and observations of meiotic behavior were made in six species and two hybrid specimens of Senecio L. (Asteraceae). Two different numbers were found: 2n=4x=40 in S. pogonias Cabr., S. ragonesei Cabr., S. sectilis Griseb. and S. viridis Phil. var. radiatus R. E. Fr. and 2n=8x=80 in S. subulatus D. Don. var. subulatus and in S. uspallatensis Hook. et Arn.; the latter showed the same chromosome number previously reported. The chromosome number of the hybrid individuals was 2n=4x=40, being their putative parents S. ragonesei and S. sectilis. B chromosomes were found in some individuals of S. pogonias, S. sectilis, S. subulatus var. subulatus and S. uspallatensis. Many meiotic irregularities such as bridges, fragments, laggard chromosomes, micronuclei and cellular fusion were observed. The results are analyzed in relation to the persistence and success of these polyploids, and the speciation mechanisms operating within this group are discussed.
format Articulo
Articulo
author López, Mariana C.
Wulff, Arturo F.
Xifreda, Cecilia Carmen
author_facet López, Mariana C.
Wulff, Arturo F.
Xifreda, Cecilia Carmen
author_sort López, Mariana C.
title Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_short Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_full Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_fullStr Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_full_unstemmed Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
title_sort chromosome contribution to andean polyploid species of senecio (asteraceae), from argentina
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/123765
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AT wulffarturof chromosomecontributiontoandeanpolyploidspeciesofsenecioasteraceaefromargentina
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bdutipo_str Repositorios
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