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Abstract:

Meiotic chromosome counts, chromosomal behaviour and meiotic configurations of ten taxa of Senecio from Argentina were examined. Most counts are original: S. crepidifolius DC., S. francisci Phil, and S. octolepis Griseb. var. saltensis (Hicken) Cabrera & Zardini have 2n = 40, and S. chrysolepis Phil., 2n = 80 + 8B. We confirmed previous reports for S. deferens Griseb. (2n = 40 + 4B), S. filaginoides DC. var. filaginoides (2n = 40), S. hieronymi Griseb. (2n = 40 + 7B), S. pampeanus Cabrera (2n = 40) and S. rudbeckiifolius Meyen & Walp. (2n = 40 + 7B). In S. bracteolatus Hook. & Arn. var. bracteolatus, we found a new number (2n = 40) that differs from the one cited previously. In four species, numerical polymorphisms for B-chromosomes were observed. Several of the analysed species presented secondary bivalent association. This phenomenon, together with other evidence, supports x = 5 as the basic chromosome number. The number of chiasmata and their positions were also surveyed, with the finding that open bivalents were the most frequent meiotic figures and terminal chiasmata the preferential position. These features are related to recombination rate, and the success and persistence of these polyploids. We discuss some systematic and evolutionary aspects in the light of cytogenetic data and conclude that polyploidy is the major force modelling the chromosome evolution within this genus. © 2005 The Linnean Society of London.

Registro:

Documento: Artículo
Título:Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina
Autor:López, M.G.; Wulff, A.F.; Poggio, L.; Xifreda, C.C.
Filiación:CIC-PBA, Instituto Fitotécnico de Santa Catalina, Garibaldi 3310 (B1836AML) Lavallol, Argentina
CIGEN, Instituto Fitotécnico de Santa Catalina, Garibaldi 3310 (B1836AML) Lavallol, Argentina
Facultad de Ciencias Exactas Y Naturales, Universidad de Buenos Aires, Intendente Güiraldes Y Costanera Norte (C1428EHA), Buenos Aires, Argentina
CONICET, Facultad de Ciencias Naturales Y Museo, Universidad Nacional de la Plata, Paseo del Bosque s/n (1900), La Plata, Argentina
LEBA, Facultad de Ciencias Naturales Y Museo, Universidad Nacional de la Plata, Paseo del Bosque s/n (1900), La Plata, Argentina
Palabras clave:Basic chromosome number; Bivalent structure; Polyploidy; Recombination; Secondary association; Secondary cycle of polyploidy; chromosome; Chrysolepis; Senecio; Senecio filaginoides
Año:2005
Volumen:148
Número:4
Página de inicio:464
Página de fin:474
Título revista:Botanical Journal of the Linnean Society
Título revista abreviado:Bot. J. Linn. Soc.
ISSN:00244074
CODEN:BJLSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v148_n4_p464_Lopez

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Citas:

---------- APA ----------
López, M.G., Wulff, A.F., Poggio, L. & Xifreda, C.C. (2005) . Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina. Botanical Journal of the Linnean Society, 148(4), 464-474.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v148_n4_p464_Lopez [ ]
---------- CHICAGO ----------
López, M.G., Wulff, A.F., Poggio, L., Xifreda, C.C. "Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina" . Botanical Journal of the Linnean Society 148, no. 4 (2005) : 464-474.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v148_n4_p464_Lopez [ ]
---------- MLA ----------
López, M.G., Wulff, A.F., Poggio, L., Xifreda, C.C. "Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina" . Botanical Journal of the Linnean Society, vol. 148, no. 4, 2005, pp. 464-474.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v148_n4_p464_Lopez [ ]
---------- VANCOUVER ----------
López, M.G., Wulff, A.F., Poggio, L., Xifreda, C.C. Chromosome numbers and meiotic studies in species of Senecio (Asteraceae) from Argentina. Bot. J. Linn. Soc. 2005;148(4):464-474.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244074_v148_n4_p464_Lopez [ ]