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Abstract Detail


Systematics Section / ASPT

Peterson, Angela [1], Peterson, Jens [2].

Molecular analysis of phylogenetic relationships among Gagea and Lloydia (Liliaceae).

AS higher level relationships of the monocots are extensively resolved, the need for comprehensive, lower level, generic and species studies employing rigorous phylogenetic and morphological character analyses increases. Within the Liliaceae Gagea and Lloydia are relatively unexplored genera with a lack of complete monographs and herbal vouchers because of the short, ephemeroide growth phase, overlapping primitive and advanced morphological characters e.g. the formation of subterranean organs and the number of ground leaves and hypothesized interspecific hybridisation; the latter we could show e.g. for G. pomeranica which represents a hybrid of G. pratensis and G. lutea. The whole number of these phenomenon causes taxonomic problems in these genera, the description of a large number of species and a nomenclature which is overloaded with synonyms. In the present study we report on the utility of intergenic regions in the plastid DNA (trnL-trnF; psbA-trnH) and of the internal transcribed spacer region of nuclear ribosomal DNA (ITS1, 5.8S rRNA, ITS2) in order to assess interspecific and generic relationships. These molecular data are mostly consistent with existing infrageneric Gagea taxonomy. But our molecular data (cpDNA and nrDNA) and the initial morphological analysis as well as the literature study, all indicate that the taxonomic position of Lloydia as an independent genus within the Liliaceae seems to be doubtful. However, a clear understanding of relationships among Gagea and Lloydia will require data from other DNA regions and additionally, a more complete taxon sampling of both genera. So, in cooperation with I.G. Levichev (LE) a detailed molecular and morphological study has been started including members of all Gagea sections. These data could help to get more phylogenetic insights in these species complex.


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1 - Martin Luther University Halle/Wittenberg, Biozentrum, Weinbergweg 22, Halle (Saale), D-06120, Germany
2 - State Office for Environmental Protection of Saxony-Anhalt, Department of Nature Conservation, Reideburger Str. 47, Halle (Saale), D-06116, Germany

Keywords:
Gagea
cpDNA
ITS
Taxonomy
molecular phylogenetics
hybridization
Liliaceae
Lloydia.

Presentation Type: Oral Paper:Papers for Sections
Session: 63-2
Location: 120/Ayres
Date: Wednesday, August 2nd, 2006
Time: 8:15 AM
Abstract ID:228


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