| Dokumentenart: | Artikel | ||||
|---|---|---|---|---|---|
| Titel eines Journals oder einer Zeitschrift: | Plant Systematics and Evolution | ||||
| Verlag: | SPRINGER WIEN | ||||
| Ort der Veröffentlichung: | WIEN | ||||
| Band: | 293 | ||||
| Nummer des Zeitschriftenheftes oder des Kapitels: | 1-4 | ||||
| Seitenbereich: | S. 177-191 | ||||
| Datum: | 2011 | ||||
| Institutionen: | Biologie und Vorklinische Medizin > Institut für Pflanzenwissenschaften > Arbeitsgruppe Evolution und Systematik der Pflanzen (Prof. Dr. Christoph Oberprieler) Chemie und Pharmazie > Institut für Pharmazie > Lehrstuhl Pharmazeutische Biologie (Prof. Heilmann) | ||||
| Identifikationsnummer: |
| ||||
| Stichwörter / Keywords: | NEMORENSIS GROUP COMPOSITAE; SOUTHERN ARABIAN PENINSULA; MULTILOCUS GENOTYPE DATA; PYRROLIZIDINE ALKALOIDS; REPRODUCTIVE ISOLATION; SYMPATRIC POPULATIONS; ADJACENT PART; SUBSP OVATUS; JACOBAEA; HYBRIDIZATION; AFLP fingerprinting; Asteraceae; Chemical defence; Herbivory; Hybridisation; Introgression; Pyrrolizidine alkaloids; Senecio | ||||
| Dewey-Dezimal-Klassifikation: | 500 Naturwissenschaften und Mathematik > 580 Pflanzen (Botanik) 600 Technik, Medizin, angewandte Wissenschaften > 615 Pharmazie | ||||
| Status: | Veröffentlicht | ||||
| Begutachtet: | Ja, diese Version wurde begutachtet | ||||
| An der Universität Regensburg entstanden: | Ja | ||||
| Dokumenten-ID: | 64972 |
Zusammenfassung
Mixed stands of Senecio ovatus subsp. ovatus and S. germanicus subsp. germanicus occur in the colline belt of central and eastern Europe. The latter species is adapted to more continental climate conditions and shows a later flowering time (August-September) than the widespread S. ovatus (July-August) that grows in more oceanic climates. We have surveyed 253 plants from 15 populations north of ...
Zusammenfassung
Mixed stands of Senecio ovatus subsp. ovatus and S. germanicus subsp. germanicus occur in the colline belt of central and eastern Europe. The latter species is adapted to more continental climate conditions and shows a later flowering time (August-September) than the widespread S. ovatus (July-August) that grows in more oceanic climates. We have surveyed 253 plants from 15 populations north of Regensburg (south-eastern Germany) using 16 qualitative and quantitative morphological characters and molecular markers [amplified fragment length polymorphisms (AFLP)] to detect introgressive hybridisation between these two species. Both multivariate statistical analyses based on morphological characters and the Bayesian clustering based on AFLP fingerprint data show that in most populations under study the two species form distinct entities and do not hybridise with each other. However, in one population from the Upper Palatine Forest a high number of intermediate individuals were found. A more detailed genetic (AFLP) and phytochemical (pyrrolizidine alkaloid, PA) analysis based on 125 individuals from this hybrid swarm indicated that these intermediate individuals are backcrosses towards S. germanicus. It is shown that the two species differ considerably concerning the qualitative and quantitative PA patterns and that backcrossed individuals either show an additive PA pattern or a PA pattern similar to S. germanicus, while in quantitative respects all of these individuals are approaching S. germanicus. These findings are discussed in terms of differential selection regimes influencing the fitness of pure and hybrid plants in an area which is an eco-climatological optimum for the more oceanic S. ovatus but which forms a distributional edge for the more continental S. germanicus.
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