Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 519784
Title Partial preferential chromosome pairing is genotype dependent in tetraploid rose
Author(s) Bourke, Peter M.; Arens, Paul; Voorrips, Roeland E.; Esselink, Danny; Koning-Boucoiran, Carole F.S.; Westende, Wendy van 't; Santos Leonardo, Tiago; Wissink, Patrick; Zheng, Chaozhi; Geest, Geert van; Visser, Richard G.F.; Krens, Frans A.; Smulders, Rene; Maliepaard, Chris
Source The Plant Journal 90 (2017)2. - ISSN 0960-7412 - p. 330 - 343.
Department(s) Plant Breeding
PBR Ornamentals, tissue culture and gene transfer
Plant Breeding
PBR Quantitative aspects of Plant Breeding
PBR Biodiversity and genetic variation
Mathematical and Statistical Methods - Biometris
PBR Quantitative aspects of Plant Breeding
Publication type Refereed Article in a scientific journal
Publication year 2017
Keyword(s) high-density integrated map - meiotic chromosomal pairing behaviour - polyploid genetic linkage map - Rosa hybrida - segmental allopolyploid

It has long been recognised that polyploid species do not always neatly fall into the categories of auto- or allopolyploid, leading to the term ‘segmental allopolyploid’ to describe everything in between. The meiotic behaviour of such intermediate species is not fully understood, nor is there consensus as to how to model their inheritance patterns. In this study we used a tetraploid cut rose (Rosa hybrida) population, genotyped using the 68K WagRhSNP array, to construct an ultra-high-density linkage map of all homologous chromosomes using methods previously developed for autotetraploids. Using the predicted bivalent configurations in this population we quantified differences in pairing behaviour among and along homologous chromosomes, leading us to correct our estimates of recombination frequency to account for this behaviour. This resulted in the re-mapping of 25 695 SNP markers across all homologues of the seven rose chromosomes, tailored to the pairing behaviour of each chromosome in each parent. We confirmed the inferred differences in pairing behaviour among chromosomes by examining repulsion-phase linkage estimates, which also carry information about preferential pairing and recombination. Currently, the closest sequenced relative to rose is Fragaria vesca. Aligning the integrated ultra-dense rose map with the strawberry genome sequence provided a detailed picture of the synteny, confirming overall co-linearity but also revealing new genomic rearrangements. Our results suggest that pairing affinities may vary along chromosome arms, which broadens our current understanding of segmental allopolyploidy.

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