Zytologische Studien in der GattungPopulus L.

Dillewijn, C. Van

doi:10.1007/bf01984285

Cited by 16 publications

(4 citation statements)

References 52 publications

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“…Electronic Supplementary Material Supplementary material is available for this article at http://dx.doi.org/10.1007/s00122-004- Van Dillewijin (1940) hypothesized that the ancestral chromosome number of Populus was eight. However, because Populus chromosomes are mostly small and lacking in distinctive morphological features (Smith 1943), there is scant information on chiasma frequencies and chromosomal dynamics to substantiate this claim.…”

Section: Communicated By Db Nealementioning

confidence: 99%

Large-scale heterospecific segregation distortion in Populus revealed by a dense genetic map

et al. 2004

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We report the most complete genetic map to have been constructed for the genus Populus. This map includes 544 markers mapped onto 19 linkage groups, equivalent to the Populus chromosome number, with all markers displaying internally consistent linkage patterns. We estimate the genome length to be between 2,300 and 2,500 cM, based both on the observed number of crossovers in the maternal haplotypes, as well as the total observed map length. Genome coverage was estimated to be greater than 99.9% at 20 cM per marker. We did not detect obvious recombination repression in the maternal tree (a hybrid of Populus trichocarpa Hooker x P. deltoides Marsh.) compared to the paternal tree (pure P. deltoides). Finally, most markers exhibiting segregation distortion were derived from the donor parent in this backcross, and generally occurred in large contiguous blocks on two linkage groups. We hypothesize that divergent selection has occurred on chromosomal scales among the parental species used to create this pedigree, and explore the evolutionary implications of this observation. This genetic linkage map provides the most comprehensive view of the Populus genome reported to date and will prove invaluable for future inquiries into the structural and functional genomics, evolutionary biology, and genetic improvement of this ecologically important model species.

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Section: Communicated By Db Nealementioning

confidence: 99%

Large-scale heterospecific segregation distortion in Populus revealed by a dense genetic map

et al. 2004

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“…In this species, the X/A ratio regulates sex determination, although the presence of the Y chromosome is necessary for male fertility (Smith 1963). The chromosomes of Populus are typically metacentric and small (Blackburn and Harrison 1924;Meurman 1925;Erlanson and Hermann 1927;Nakajima 1937;Islam-Faridi et al 2009), and based on cytological studies, there is no evidence of morphologically differentiated sex chromosomes in any Populus species (Peto 1938;Van Dillewijn 1940;van Buijtenen and Einspahr 1959). One generalized hypothesis is that sex chromosomes originate from autosomes, and dioecy almost certainly evolves from ancestral hermaphrodites that lacked sex chromosomes (Muller 1914;Liu et al 2004).…”

Section: Introductionmentioning

confidence: 99%

The obscure events contributing to the evolution of an incipient sex chromosome in Populus: a retrospective working hypothesis

Tuskan

DiFazio

Faivre-Rampant³

et al. 2012

Tree Genetics & Genomes

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“…P. alba is a characteristic of floodplain forests, P. tremula, on the other hand, is a pioneer species of upland forests, with greater ecological amplitude/plasticity. Both species and their hybrids are usually diploid (van Dillewijn 1940).…”

Section: Introductionmentioning

confidence: 99%

Phylogeography of Populus alba (L.) and Populus tremula (L.) in Central Europe: secondary contact and hybridisation during recolonisation from disconnected refugia

Fussi

Lexer

Heinze

2010

Tree Genetics & Genomes

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The central aim of this paper is to clarify the picture of postglacial recolonisation and the reconstruction of refugia of Populus alba (L.) and Populus tremula (L.) in the light of hybridisation of the two species. We focussed our study on Central and Southeastern Europe including reference samples from Spain, Sweden and Northern Africa.We investigated 414 individuals of 26 populations using restriction fragment length polymorphisms (PCR-RFLPs) in six maternally inherited chloroplast markers. Altogether, 57 haplotypes were analysed of which four indicated hybridisation events in the past. Phylogeographic structure was found for P. alba with low diversity in Eastern Europe versus high diversity in Italy and Central Europe. A lack of phylogeographic structure was assessed for P. tremula as expected for a boreal forest tree, and diversity was evenly distributed in the studied populations. Two main refugia were identified for P. alba in Italy and Romania. A previously described hybrid zone between species in Central Europe turned out also to be a zone of contact between southern and eastern chloroplast lineages in P. alba. In contrast, P. tremula recolonised its present habitats in Central Europe from several refugia near the former ice cap. We assume separate disconnected refugia for P. alba and P. tremula and suggest an immigration scenario involving the mixing of colonisation routes and interspecific introgression to be responsible for the observed patterns.

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Zytologische Studien in der GattungPopulus L.

Cited by 16 publications

References 52 publications

Large-scale heterospecific segregation distortion in Populus revealed by a dense genetic map

Large-scale heterospecific segregation distortion in Populus revealed by a dense genetic map

The obscure events contributing to the evolution of an incipient sex chromosome in Populus: a retrospective working hypothesis

Phylogeography of Populus alba (L.) and Populus tremula (L.) in Central Europe: secondary contact and hybridisation during recolonisation from disconnected refugia

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