Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/73461
Título: Chloroplast DNA restriction site phylogeny of the genus Androcymbium (Colchicaceae)
Autores/as: Caujape-Castells, Juli
Jansen, Robert K.
Pedrola-Monfort, Joan
Membrives, Nuria
Clasificación UNESCO: 2417 Biología vegetal (botánica)
241714 Genética vegetal
Palabras clave: Species-Diversity
Canary-Islands
Evolution
Asteraceae
Endonucleases, et al.
Fecha de publicación: 1999
Publicación seriada: Systematic Botany 
Resumen: We examined phylogenetic relationships among 51 populations representing 18 of the approximately 40 currently recognized species in the genus Androcymbium using 559 parsimony informative cpDNA restriction site changes. Our results indicate that the genus is monophyletic and had a southern African origin. According to our estimates of divergence times, species distributed in North Africa arose in the early Miocene from an ancestor related to A. euconoides. The two Canary Island endemics originated from an ancestor related to the North African A. wyssianum in the early Pliocene. Strong support for the monophyly of all the species represented by more than one population casts doubt on the inclusion of the six North African species into a Androcymbium gramineum complex and provides strong evidence against the possibility of reticulation in these species. Lack of support for the monophyly of the two currently recognized sections (Androcymbium and Erythrostictus) suggests that the presence of wing-like appendages on the tepals is not a reliable taxonomic character for sectional circumscription. Molecular clock estimates emphasize the importance of ecological diversity in the differentiation of South African species. In sharp contrast, the much less pronounced pattern of change among north African species seems to have been fostered by their relatively recent origin and by the uniform ecological conditions that prevail in their areas of geographic distribution.
URI: http://hdl.handle.net/10553/73461
ISSN: 0363-6445
DOI: 10.2307/2419644
Fuente: Systematic Botany [ISSN 0363-6445], v. 24 (4), p. 581-597, (Octubre-Diciembre 1999)
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