Cytotype diversity in the Sorbus complex (Rosaceae) in Britain: sorting out the puzzle

Pellicer, Jaume; Clermont, Sandra; Houston, L.; Rich, T. C. G.; Fay, Michael F.

doi:10.1093/aob/mcs185

Cited by 75 publications

(96 citation statements)

References 31 publications

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“…In this case, chromosome counts have been carried out on some of the Sorbus taxa with diploid (2n534), triploid (2n551), and tetraploid (2n568) individuals found among the genus (Bailey et al, 2008). The use of flow cytometry to estimate the relative DNA content, and hence to infer DNA ploidies, has recently been used to analyse the cytotype diversity in a large-scale survey of British Sorbus species (Pellicer et al, 2012). This study revealed the high incidence of polyploidy in the genus (3x, 4x, and 5x), while also confirming the constancy of diploid cytotypes in parental taxa in Britain, including all samples of S. torminalis evaluated.…”

Section: Introductionsupporting

confidence: 59%

“…Sorbus leyana Wilmott . This complex array of morphologically diverse taxa arose from hybridisation events involving crossings between the diploid species and other polyploid apomicts , resulting in a taxonomically intricate polyploid network (Pellicer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Although there have been reports of polyploid S. torminalis from the Balkans and Spain (Aldasoro et al, 1998;Siljak-Yakovlev et al, 2010) (tetraploid and triploid, respectively), no such plants have ever been reported from Britain. It has been suggested that these individuals may be of hybrid origin but this hypothesis has yet to be confirmed (Pellicer et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Polyploid wild service tree: first record of a triploidSorbus torminalis(Rosaceae) in Britain

Hamston

Pellicer

Fay

2015

New Journal of Botany

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The genus Sorbus L. is known for its complex taxonomy involving many polyploid species. However, Sorbus torminalis (L.) Crantz has long been assumed to be uniformly diploid. An analysis of DNA content using flow cytometry revealed a triploid individual within 0.5 km of tetraploid S. devoniensis E.F. Warb. at South Tawton, Devon. The leaf morphology suggests the novel Sorbus to be a spontaneous S. torminalis triploid rather than the result of interspecific hybridisation.

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Section: Introductionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyploid wild service tree: first record of a triploidSorbus torminalis(Rosaceae) in Britain

Hamston

Pellicer

Fay

2015

New Journal of Botany

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“…High diversity of ploidy levels is not unusual in members of Rosaceae, among which at least 32 of 85 genera show polyploidy , and this has been studied in detail in, for example, Crataegus Lo et al 2010) and Sorbus (Robertson et al 2010;Pellecier et al 2012). On the other hand, hexaploids are not common in the family, having so far been recorded only in Cotoneaster, Crataegus, Malus , and Polylepis (Segovia et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Complex Geographical Distribution of Ploidy Levels inPolylepis australis(Rosaceae), an Endemic Tree Line Species in Argentina

Kessler

Kühn

Neffa

et al. 2014

International Journal of Plant Sciences

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Editor: Richard ReePremise of research. The geographical distribution of ploidy levels provides insights into evolutionary pathways. For the subtropical tree line species Polylepis australis (Rosaceae), we tested the hypotheses that (1a) incidence of polyploidy is higher in the northern parts than in the southern parts of the species range due to the presence of related species that might favor hybridization (allopolyploidy), (1b) incidence of polyploidy is higher in the southern part of the range because the species here presumably reaches the limit of its environmental tolerance (autopolyploidy), and (2) ploidy levels increase with elevation, as polyploids are believed to perform better in stressful environments.Methodology. We used flow cytometry to assess the ploidy levels of 361 individuals from 27 populations across most of the distribution range of the species in two disjunct Argentinean high mountain regions.Pivotal results. The northern stands had lower ploidy levels (diploid) than the southern populations, in which we found mainly tetraploids intermixed with diploids, triploids, and a single hexaploid. We did not find any environmental correlates to the geographical distribution of ploidy levels.Conclusions. Polyploidy appears to have arisen in P. australis via autopolyploidy, either twice in different parts of the range or, more likely, once followed by long-distance dispersal. This is also supported by amplified fragment length polymorphism (AFLP) data from a previous study that confirmed higher numbers of AFLP fragments and private bands in the southern populations. The checkerboard distribution of ploidy levels in the southern Sierras de Có rdoba may represent a time capture of the spread of the polyploid condition. We propose that polyploidy represents a key factor to understanding the high morphological variation in P. australis and should be taken into account in ongoing reforestation activities.

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“…: 0.79±0.01, and 1.05±0.011 were detected. According to Pellicer et al (2012), the genome sizes within the genus Sorbus are relatively well conserved among different lineages, both in diploids and polyploids. As we previously calibrated the ratio of 0.52 with a diploid chromosome count (Meyer et al 2014) the measured DNA-ploidy levels correspond to tri-and tetraploidy (Electronic Appendix 3).…”

Section: Dna-ploidymentioning

confidence: 99%

Genetic variability and morphology of tri- and tetraploid members of the Sorbus aria complex in northern Bavaria

Feulner¹,

Weig²,

Paule³

et al. 2017

Preslia

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. (2017): Genetic variability and morphology of tri-and tetraploid members of the Sorbus aria complex in northern Bavaria. -Preslia 89: 275-290.The Sorbus aria complex in the Franconian Jura, northern Bavaria, consists of the sexual diploid S. aria s. str. and putative apomictic polyploids, among them S. collina and S. danubialis. Here, the genetic and cytotypic structure of the S. aria complex and the proportion of clonal versus variable genotypes with a special focus on S. collina are studied using nuclear microsatellite markers, flow cytometry and multivariate morphometrics. In the Franconian Jura the tetraploid S. collina is the most frequent taxon in the S. aria complex. It consists of six closely related clones and a high number of unique genotypes, which were found in 70% of the populations studied. Morphologically, most of the clones and the unique tetraploid genotypes are not significantly differentiated. Therefore, all of them could be assigned to S. collina. Mechanisms that could result in the high number of genotypes within S. collina are accumulations of mutations, remnant sexuality, multiple polyploidization events and backcrossing. The results show that S. collina is a genetically quite variable facultative apomictic taxon. Triploids were identified sporadically and the microsatellites pointed to an origin from repeated hybridization events between diploid S. aria s. str. and S. collina. K e y w o r d s:

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Cytotype diversity in the Sorbus complex (Rosaceae) in Britain: sorting out the puzzle

Cited by 75 publications

References 31 publications

Polyploid wild service tree: first record of a triploidSorbus torminalis(Rosaceae) in Britain

Polyploid wild service tree: first record of a triploidSorbus torminalis(Rosaceae) in Britain

Complex Geographical Distribution of Ploidy Levels inPolylepis australis(Rosaceae), an Endemic Tree Line Species in Argentina

Genetic variability and morphology of tri- and tetraploid members of the Sorbus aria complex in northern Bavaria

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