Wagner, Florian and Ott, Tankred and Zimmer, Claudia and Reichhart, Verena and Vogt, Robert and Oberprieler, Christoph (2019) 'At the crossroads towards polyploidy': genomic divergence and extent of homoploid hybridization are drivers for the formation of the ox-eye daisy polyploid complex (Leucanthemum, Compositae-Anthemideae). NEW PHYTOLOGIST, 223 (4). pp. 2039-2053. ISSN 0028-646X, 1469-8137
Full text not available from this repository. (Request a copy)Abstract
Polyploidy plays a paramount role in phytodiversity, but the causes of this evolutionary pathway require further study. Here, we use phylogenetic methods to examine possible polyploidy-promoting factors by comparing diploid representatives of the comprehensive European polyploid complex Leucanthemum with members of its strictly diploid North African counterpart Rhodanthemum. We investigate genetic divergence and gene flow among all diploid lineages of both genera to evaluate the role of genomic differentiation and hybridization for polyploid speciation. To test whether hybridization in Leucanthemum has been triggered by the geological conditions during its diversification, we additionally generate a time-calibrated phylogeny of 46 species of the subtribe Leucantheminae. Leucanthemum shows a significantly higher genetic divergence and hybridization signal among diploid lineages compared with Rhodanthemum, in spite of a similar crown age and diversification pattern during the Quaternary. Our study demonstrates the importance of genetic differentiation among diploid progenitors and their concurrent affinity for natural hybridization for the formation of a polyploid complex. Furthermore, the role of climate-induced range overlaps on hybridization and polyploid speciation during the Quaternary is discussed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PLURIFLORUM CLAN COMPOSITAE; SPECIES DELIMITATION; EVOLUTIONARY CONSEQUENCES; CHROMOSOME-NUMBERS; HYBRID SPECIATION; PARENTAL GENOMES; MILL. COMPOSITAE; PLANTS; ASTERACEAE; INFERENCE; Darlington's rule; genetic divergence; homoploid hybridization; molecular dating; multispecies coalescent; polyploidy; Quaternary |
| Subjects: | 500 Science > 580 Botanical sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Pflanzenwissenschaften > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 31 Mar 2020 08:23 |
| Last Modified: | 31 Mar 2020 08:23 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26385 |
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