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Abstract:

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.

Registro:

Documento: Artículo
Título:Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina
Autor:López, M.G.; Wulff, A.F.; Wulff, A.F.; Xifreda, C.C.; Xifreda, C.C.
Filiación:Laboratorio de Citogenética y Evolución, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. Intendente Güiraldes y Costanera Norte, Buenos Aires, 1428, Argentina
Member of the Carrera del Personal de Apoyo (CONICET), Argentina
Laboratorio de Etnobotánica y Botánica Aplicada, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, La Plata, 1900, Argentina
Member of the Carrera del Investigador Científico (CIC-PBA), Argentina
Palabras clave:B chromosomes; Cell fusion; Cytogenetics; Meiotic behavior; Polyploidy; Senecio
Año:2002
Volumen:55
Número:1
Página de inicio:27
Página de fin:35
DOI: http://dx.doi.org/10.1080/00087114.2002.10589255
Título revista:Caryologia
Título revista abreviado:Caryologia
ISSN:00087114
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00087114_v55_n1_p27_Lopez

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Citas:

---------- APA ----------
López, M.G., Wulff, A.F., Wulff, A.F., Xifreda, C.C. & Xifreda, C.C. (2002) . Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina. Caryologia, 55(1), 27-35.
http://dx.doi.org/10.1080/00087114.2002.10589255
---------- CHICAGO ----------
López, M.G., Wulff, A.F., Wulff, A.F., Xifreda, C.C., Xifreda, C.C. "Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina" . Caryologia 55, no. 1 (2002) : 27-35.
http://dx.doi.org/10.1080/00087114.2002.10589255
---------- MLA ----------
López, M.G., Wulff, A.F., Wulff, A.F., Xifreda, C.C., Xifreda, C.C. "Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina" . Caryologia, vol. 55, no. 1, 2002, pp. 27-35.
http://dx.doi.org/10.1080/00087114.2002.10589255
---------- VANCOUVER ----------
López, M.G., Wulff, A.F., Wulff, A.F., Xifreda, C.C., Xifreda, C.C. Chromosome contribution to Andean Polyploid Species of Senecio (Asteraceae), from Argentina. Caryologia. 2002;55(1):27-35.
http://dx.doi.org/10.1080/00087114.2002.10589255