Recurring Origins of Allopolyploid Species in
            <i>Asplenium</i>

Werth, Charles R.; Guttman, Sheldon I.; Eshbaugh, W. Hardy

doi:10.1126/science.228.4700.731

Cited by 134 publications

(73 citation statements)

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“…Many examples of variation in locus copy number among tetraploid populations can also be found in the plant literature [35][36][37] . Asplenium bradleyi is a tetraploid fern formed by the hybridization of A. platyneuron and A. montanum, which are both diploid 36 .…”

Section: 'Lynch and Conerymentioning

confidence: 99%

“…Asplenium bradleyi is a tetraploid fern formed by the hybridization of A. platyneuron and A. montanum, which are both diploid 36 . Comparisons of isozyme expression patterns in these species showed that one of the A. bradleyi populations had lost the isocitrate dehydrogenase (IDH) locus that came from A. montanum 36 Comparisons between tetraploid taxa and their diploid sister groups can determine if the association between genome duplication and speciation that we see in Paracanthopterygii (the group that includes salmonids and osmerids) is widespread. Some 50-70% of angiosperms appear to have experienced genome doubling 39 , therefore it might be especially prudent to survey this group for a phylogenetic link between polyploidy and speciation.…”

Section: 'Lynch and Conerymentioning

confidence: 99%

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Genome duplication, divergent resolution and speciation

2001

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What are the evolutionary consequences of gene duplication? One answer is speciation, according to a model initially called Reciprocal Silencing and recently expanded and renamed Divergent Resolution. This model shows how the loss of different copies of a duplicated gene in allopatric populations (divergent resolution) can promote speciation by genetically isolating these populations should they become reunited. Genome duplication events produce thousands of duplicated genes. Therefore, lineages with a history of genome duplication might have been especially prone to speciation via divergent resolution

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Section: 'Lynch and Conerymentioning

confidence: 99%

Section: 'Lynch and Conerymentioning

confidence: 99%

Genome duplication, divergent resolution and speciation

2001

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“…This mode of origin for allopolyploids has been documented previously for the angiosperms Tragopogon mirus and T. miscellus (Roose & Gottlieb, 1976;, the ptendophytes Asplenium bradleyi D. C. Eaton and A. pinnatifidium Nutt. (Werth et a!., 1985) and the bryo- , 1988). There is also recent evidence that autopolyploids of the angiosperm Heuchera micrantha Dougi.…”

mentioning

confidence: 99%

Multiple origins and genetic diversity in the newly arisen allopolyploid species, Senecio cambrensis Rosser (Compositae)

1992

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A survey of allozyme variation was conducted in populations of the newly arisen allopolyploid species Senecio cambrensis and its two parental species S. vulgaris and S. squalidus sampled from the three locations in Britain where S. cambrensis is known to occur, i.e. at Wrexham and Mochdre in Wales, and Edinburgh in Scotland. Electrophoretic variation at the Acp-1 and aEst-1 loci provided strong evidence of separate origins of S. cambrensis in Wales and Edinburgh. The possibility of two additional independent origins of the species in Wales was indicated by the variadon pattern at the Aat-3 locus, although this variation could be explained as a result of segregation from a fixed heterozygote (representative of a single origin) following pairing between homoeologous chromosomes, as could the pattern of variation recorded at the j3Est-3 locus. For no enzyme system were additional allozymes found in S. cambrensis which were not present in one of the respective parents. The ability of S. cambrensis to originate at different locations and to generate genetic diversity following recombination between its parental genomes, might act in favour of its establishment and diversification in Britain.

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“…Multiple origins of allopolyploids have, on rare occasions, been suggested, based on allozyme data (Roose and Gottlieb, 1976;Werth et al, 1985;Wyatt et al, 1988). The fact that autotetraploids in H. micrantha are not only numerous and widespread but are also of multiple origin is significant because, unlike allopolyploidy, autopolyploidy typically has been considered to be rare and of little evolutionary importance (Stebbins, 1950;Lewis, 1980;Levin, 1983;Soltis and Rieseberg, 1986).…”

Section: Discussionmentioning

confidence: 99%