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Partial preferential chromosome pairing is genotype dependent in tetraploid rose
Peter M Bourke1, Paul Arens1, Roeland E Voorrips1
1Plant Breeding, Wageningen University & Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.
The Plant Journal : for Cell and Molecular Biology
|February 1, 2017
Summary
This study reveals variable chromosome pairing in segmental allopolyploid roses, improving genetic mapping accuracy. Understanding these patterns is key for modeling inheritance in complex polyploid species.
Area of Science:
- Genetics
- Plant Breeding
- Genomics
Background:
- Polyploid species classification is complex, with segmental allopolyploids exhibiting intermediate characteristics.
- The meiotic behavior and inheritance patterns of segmental allopolyploids remain poorly understood.
- Accurate genetic mapping in polyploids requires accounting for complex homologous chromosome interactions.
Purpose of the Study:
- To construct an ultra-high-density linkage map for a tetraploid rose (Rosa hybrida).
- To investigate and quantify differences in meiotic pairing behavior among homologous chromosomes.
- To refine recombination frequency estimates and improve genetic mapping in segmental allopolyploids.
Main Methods:
- Genotyping a tetraploid rose population using the 68K WagRhSNP array.
- Developing and applying methods for autotetraploid linkage mapping.
- Predicting bivalent configurations to quantify chromosome pairing affinities.
- Re-mapping SNP markers based on observed pairing behaviors.
- Comparative genomics by aligning the rose map with the Fragaria vesca genome.
Main Results:
- An ultra-high-density linkage map was constructed for all homologous chromosomes in the rose.
- Significant variations in meiotic pairing behavior were observed among and along homologous chromosomes.
- Recombination frequency estimates were corrected, leading to the re-mapping of 25,695 SNP markers.
- Comparative analysis revealed synteny with strawberry (Fragaria vesca), confirming co-linearity and identifying new genomic rearrangements.
- Evidence suggests that pairing affinities can vary along chromosome arms.
Conclusions:
- The study provides a refined understanding of meiotic pairing in segmental allopolyploids.
- Accurate genetic mapping in roses requires accounting for chromosome-specific pairing behaviors.
- Variations in pairing affinities along chromosome arms broaden the understanding of segmental allopolyploidy.
- The findings have implications for breeding and genetic studies in polyploid plants.
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