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Abstract:

The systematic identity of Senecio madagascariensis is ratified against the opinion that it is conspecific with Senecio inaequidens. Both species are native to South Africa and have been merged in the 'Senecio inaequidens complex', a group of entities difficult to distinguish from each other. Senecio madagascariensis is widespread in South America and Australia, where it is an invasive weed. Mitotic and meiotic studies were conducted on Argentinian material; chromosome counts solved the chromosome number controversy, validating 2n = 20. The karyotype was symmetrical, composed of ten pairs of metacentric chromosomes varying from 1.62 to 2.38 μm in length. The most frequent number of satellited chromosomes was three, but their position was difficult to assign. Meiosis was regular, with a configuration of ten predominantly open bivalents. Univalents and quadrivalents were rarely observed. High frequencies of secondary associations of bivalents, chromosome asynchrony and bivalent grouping were documented, reinforcing the hypothesis that x = 5 is the basic chromosome number. Pollen stainability ranged from 94 to 99%. The relevance of chromosomal studies in the circumscription of S. madagascariensis is discussed. Hybridization and polyploidy, as principal evolutionary forces in this genus, explain the systematic difficulties. © 2008 The Linnean Society of London.

Registro:

Documento: Artículo
Título:South African fireweed Senecio madagascariensis (Asteraceae) in Argentina: Relevance of chromosome studies to its systematics
Autor:López, M.G.; Wulff, A.F.; Poggio, L.; Xifreda, C.C.
Filiación:CONICET, LACyE, Universidad de Buenos Aires, Intendente Güiraldes y Costanera Norte, (C1428EHA), Buenos Aires, Argentina
CIC-PBA, LEBA, Universidad Nacional de La Plata, Calle 64 No. 3, (B1900FWA), La Plata, Argentina
Palabras clave:Basic chromosome number; Hybridization; Karyotype; Meiotic analysis; Polyploidy; Secondary association of bivalents; Senecio inaequidens; chromosome; conspecific; dicotyledon; evolutionary biology; geographical distribution; hybridization; invasive species; karyotype; native species; pollen; polyploidy; taxonomy; weed; Africa; Argentina; South Africa; South America; Southern Africa; Sub-Saharan Africa; Asteraceae; Bassia scoparia; Chamerion angustifolium; Senecio; Senecio inaequidens; Senecio madagascariensis
Año:2009
Volumen:158
Número:4
Página de inicio:613
Página de fin:620
DOI: http://dx.doi.org/10.1111/j.1095-8339.2008.00865.x
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_v158_n4_p613_Lopez

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Citas:

---------- APA ----------
López, M.G., Wulff, A.F., Poggio, L. & Xifreda, C.C. (2009) . South African fireweed Senecio madagascariensis (Asteraceae) in Argentina: Relevance of chromosome studies to its systematics. Botanical Journal of the Linnean Society, 158(4), 613-620.
http://dx.doi.org/10.1111/j.1095-8339.2008.00865.x
---------- CHICAGO ----------
López, M.G., Wulff, A.F., Poggio, L., Xifreda, C.C. "South African fireweed Senecio madagascariensis (Asteraceae) in Argentina: Relevance of chromosome studies to its systematics" . Botanical Journal of the Linnean Society 158, no. 4 (2009) : 613-620.
http://dx.doi.org/10.1111/j.1095-8339.2008.00865.x
---------- MLA ----------
López, M.G., Wulff, A.F., Poggio, L., Xifreda, C.C. "South African fireweed Senecio madagascariensis (Asteraceae) in Argentina: Relevance of chromosome studies to its systematics" . Botanical Journal of the Linnean Society, vol. 158, no. 4, 2009, pp. 613-620.
http://dx.doi.org/10.1111/j.1095-8339.2008.00865.x
---------- VANCOUVER ----------
López, M.G., Wulff, A.F., Poggio, L., Xifreda, C.C. South African fireweed Senecio madagascariensis (Asteraceae) in Argentina: Relevance of chromosome studies to its systematics. Bot. J. Linn. Soc. 2009;158(4):613-620.
http://dx.doi.org/10.1111/j.1095-8339.2008.00865.x