期刊
ECOLOGY AND EVOLUTION
卷 5, 期 15, 页码 3003-3022出版社
WILEY
DOI: 10.1002/ece3.1570
关键词
Hybridization; Rhododendron; species differentiation; AFLP
资金
- The Royal Horticultural Society's Rhododendron, Camellia and Magnolia Group
- NERC [NE/B500658/1]
- Davis Expedition Fund
- Natural Environment Research Council [NE/B500658/1] Funding Source: researchfish
An increasing number of studies of hybridization in recent years have revealed that complete reproductive isolation between species is frequently not finalized in more or less closely related organisms. Most of these species do, however, seem to retain their phenotypical characteristics despite the implication of gene flow, highlighting the remaining gap in our knowledge of how much of an organism's genome is permeable to gene flow, and which factors promote or prevent hybridization. We used AFLP markers to investigate the genetic composition of three populations involving two interfertile Rhododendron species: two sympatric populations, of which only one contained hybrids, and a further hybrid-dominated population. No fixed differences between the species were found, and only 5.8% of the markers showed some degree of species differentiation. Additionally, 45.5% of highly species-differentiating markers experienced significant transmission distortion in the hybrids, which was most pronounced in F1 hybrids, suggesting that factors conveying incompatibilities are still segregating within the species. Furthermore, the two hybrid populations showed stark contrasting composition of hybrids; one was an asymmetrically backcrossing hybrid swarm, while in the other, backcrosses were absent, thus preventing gene flow.
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