Greiner, Roland and Oberprieler, Christoph (2012) The role of inter-ploidy block for reproductive isolation of the diploid Leucanthemum pluriflorum Pau (Compositae, Anthemideae) and its tetra- and hexaploid relatives. FLORA, 207 (9). pp. 629-635. ISSN 0367-2530,
Full text not available from this repository. (Request a copy)Abstract
Theory suggests that post-zygotic reproductive isolation of polyploids from their diploid progenitors is often caused by developmental disorder in the endosperm of hybrid seeds. Yet, this so-called triploid block is increasingly recognized to be less strong than initially assumed, indicating that other isolation mechanisms are needed to explain reproductive isolation of polyploids and diploids. In the present study, the extent of inter-ploidy block was quantified based on crossing experiments between closely related diploid, tetraploid, and hexaploid species from the genus Leucanthemum Mill. (Compositae, Anthemideae). Seed set and viability of seeds obtained from inter-cytotype crosses were measured and compared to fertilities of intra-cytotype crosses. Although inter-ploidy block was observed when diploids acted as pollen donors, the main observation was that all inter-ploidy crosses were capable of producing viable offspring. By contrast, flow cytometrical analysis of 233 individuals from natural populations did not reveal the presence of any unambiguous cross-ploidy offspring in the field. Hence, the results of the present study demonstrate that inter-cytotype mating may be rare even though inter-ploidy block is weak Consequently, it can be assumed that pre-zygotic barriers and reduced fitness of inter-cytotype hybrids play a decisive role in the reproductive isolation of polyploid Leucanthemum species. (c) 2012 Elsevier GmbH. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHAMERION-ANGUSTIFOLIUM ONAGRACEAE; MINORITY CYTOTYPE EXCLUSION; INBREEDING DEPRESSION; SELF-INCOMPATIBILITY; PLANTS; EVOLUTION; ESTABLISHMENT; POPULATIONS; POLYPLOIDY; AUTOTETRAPLOIDS; Crossing experiments; Flow cytometry; Hybridization; Polyploidy; Triploid block |
| 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: | 26 May 2020 04:58 |
| Last Modified: | 26 May 2020 04:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/19429 |
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