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Introgression reshapes recombination distribution in grapevine interspecific hybrids
Marion Delame1,2, Emilce Prado1, Sophie Blanc1
1SVQV UMR-A 1131, INRA, Université de Strasbourg, 68000, Colmar, France.
Summary
Grape breeding using wild Vitis rotundifolia is challenging due to fertility issues. Recombination rates in hybrids vary based on introgressed region length, offering insights for optimizing crosses.
Area of Science:
- Plant genetics
- Genomics
- Plant breeding
Background:
- Vitis rotundifolia offers disease resistance valuable for grape breeding.
- Interspecific crosses between V. rotundifolia and V. vinifera yield few, infertile hybrids.
- Understanding genetic barriers is crucial for successful grape breeding.
Purpose of the Study:
- Identify genetic and genomic factors hindering V. rotundifolia x V. vinifera crosses.
- Analyze recombination patterns in interspecific grapevine hybrids.
- Optimize the use of V. rotundifolia in grape breeding programs.
Main Methods:
- Generated three mapping populations via pseudo-backcrosses.
- Utilized genotyping-by-sequencing (GBS) for high-density genetic maps.
- Determined chromosome composition in hybrid individuals.
Main Results:
- Confirmed synteny between V. rotundifolia and V. vinifera, with exceptions on chromosome 7.
- Recombination rate in hybrids depends on introgressed region length.
- Recombination is suppressed in homeologous regions and enhanced in homologous regions of partly homeologous chromosomes.
Conclusions:
- Total genetic length of chromosomes is conserved in V. vinifera and hybrid maps.
- Findings provide insights for optimizing introgression from wild Vitis species.
- This research aids in improving grape breeding strategies.
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