AFLP and breeding system studies indicate vicariance origin for scattered populations and enigmatic low fecundity in the Moroccan endemic Hypochaeris angustifolia (Asteraceae), sister taxon to all of the South American Hypochaeris species.

Autor: Terrab A; Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Apdo. 1095, 41080-Sevilla, Spain., Ortiz MA, Talavera M, Ariza MJ, Moriana Mdel C, García-Castaño JL, Tremetsberger K, Stuessy TF, Baeza CM, Urtubey E, Ruas Cde F, Casimiro-Soriguer R, Balao F, Gibbs PE, Talavera S
Jazyk: angličtina
Zdroj: Molecular phylogenetics and evolution [Mol Phylogenet Evol] 2009 Oct; Vol. 53 (1), pp. 13-22. Date of Electronic Publication: 2009 Jun 18.
DOI: 10.1016/j.ympev.2009.06.008
Abstrakt: We used Amplified Fragment Length Polymorphism markers (AFLP) and breeding system studies to investigate the population structure and reproductive biology of Hypochaeris angustifolia (Asteraceae: Cichorieae). This species is endemic to altiplanos of the Atlas Mountains (Morocco) where it occurs in scattered populations, and it is the sister species to c. 40 species of this genus in South America. PCoA, NJ, and Bayesian clustering, revealed that the populations are very isolated whilst AFLP parameters show that almost all populations have marked genetic divergence. We contend that these features are more in accord with a vicariance origin for the scattered populations of H. angustifolia, rather than establishment by long-distance dispersal. The breeding system studies revealed that H. angustifolia is a self-incompatible species, with low fecundity in natural and in experimental crosses, probably due to a low frequency of compatible phenotypes within and between the populations.
Databáze: MEDLINE
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