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001-es BibID:	BIBFORM084442
Első szerző:	Bartha László
Cím:	Molecular evidence for reticulate speciation in Astragalus (Fabaceae) as revealed by a case study from sect. Dissitiflori / Bartha László, Dragoş Nicolae, Molnár V. Attila, Sramkó Gábor
Dátum:	2013
ISSN:	1916-2790 1916-2804
Megjegyzések:	Although hybridization has long been recognized as a major force driving speciation in land plants, it has not yet been evidenced in Astragalus, the largest angiosperm genus. Here, we reveal the possible contribution of hybridization to speciation in Astragalus by employing cloning of the nrDNA ITS region and sampling three plastid regions (ycf1, ndhF?rpl32, and rpl32?trnL) in taxa belonging to sect. Dissitiflori. Phylogenetic network and tree analyses uncovered various levels of intra-individual and intraspecific polymorphism of ITS in most of the taxa investigated. Two distantly related ribotype groups were found to be shared by the closely related polyploids Astragalus pallescens M.Bieb., Astragalus peterfii Jáv., and Astragalus pseudoglaucus Klokov suggesting ancient hybridization followed by incomplete lineage sorting (i.e., shared ancestral polymorphism) in nrDNA ITS. Reticulation is also invoked as an underlying evolutionary process behind the statistically highly supported incongruent placement of A. pseudoglaucus and Astragalus vesicarius subsp. pastellianus (Pollini) Arcang. in nuclear versus plastid phylogenies. The phylogenetic results also shed light on taxonomic controversies in the section, such as the false synonimization ofA. peterfiiunderA. vesicarius s.l. Our results provide evidence for the (at least past) existence of speciation processes driven by hybridization in Astragalus.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk hybridization ycf1 nrDNA ITS cloning allopolyploidy reticulation
Megjelenés:	Botany. - 91 : 10 (2013), p. 702-714. -
További szerzők:	Dragoş, Nicolae Molnár V. Attila (1969-) (biológus, botanikus) Sramkó Gábor (1981-) (biológus)
Pályázati támogatás:	TÁMOP-4.2.4.A/ 2-11-1-2012-0001 TÁMOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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