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

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 Gabriela, Wulff, Arturo Federico
Publicado: 2002
Materias:
B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v55_n1_p27_Lopez
http://hdl.handle.net/20.500.12110/paper_00087114_v55_n1_p27_Lopez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00087114_v55_n1_p27_Lopez
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spelling paper:paper_00087114_v55_n1_p27_Lopez2023-06-08T14:33:17Z Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina López, Mariana Gabriela Wulff, Arturo Federico B chromosomes Cell fusion Cytogenetics Meiotic behavior Polyploidy Senecio 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. © 2002 Taylor & Francis Group, LLC. Fil:López, M.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Wulff, A.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2002 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v55_n1_p27_Lopez http://hdl.handle.net/20.500.12110/paper_00087114_v55_n1_p27_Lopez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
spellingShingle B chromosomes
Cell fusion
Cytogenetics
Meiotic behavior
Polyploidy
Senecio
López, Mariana Gabriela
Wulff, Arturo Federico
Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
topic_facet 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. © 2002 Taylor & Francis Group, LLC.
author López, Mariana Gabriela
Wulff, Arturo Federico
author_facet López, Mariana Gabriela
Wulff, Arturo Federico
author_sort López, Mariana Gabriela
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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v55_n1_p27_Lopez
http://hdl.handle.net/20.500.12110/paper_00087114_v55_n1_p27_Lopez
work_keys_str_mv AT lopezmarianagabriela chromosomecontributiontoandeanpolyploidspeciesofsenecioasteraceaefromargentina
AT wulffarturofederico chromosomecontributiontoandeanpolyploidspeciesofsenecioasteraceaefromargentina
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