Abstract
We present here the first study of linkage disequilibrium (LD) in cultivated grapevine, Vitis vinifera L. subsp. vinifera (sativa), an outcrossing highly heterozygous perennial species. Our goal was to characterize the amount and pattern of LD at the scale of a few centiMorgans (cM) between 38 microsatellite loci located on five linkage groups, in order to assess its origin and potential applications. We used a core collection of 141 cultivars representing the diversity of the cultivated compartment. LD was evaluated with both independence tests and multilocus r 2, both on raw genotypic and reconstructed haplotypic data. Significant genotypic LD was found only within linkage groups, extending up to 16.8 cM. It appeared not to be influenced by the weak structure of the sample and seemed to be mainly of haplotypic origin. Significant haplotypic LD was found over 30 cM. Both genotypic and haplotypic r 2 values declined to around 0.1 within 5–10 cM, suggesting a rather narrow genetic base of the cultivated compartment and limited recombination since domestication events. These first results open up a few application opportunities for association mapping of QTLs and marker assisted selection.
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Acknowledgements
This research was funded by INRA. We thank D. Vares for Vassal collection plant and data management, V. Laucou for providing the DNA, T. Bataillon for his help with Mstrat, and two anonymous reviewers, B. Courtois, M. Deu, V. Laucou, J. P. Péros, and H. A. Tsitrone for useful comments on a previous version of the manuscript.
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Barnaud, A., Lacombe, T. & Doligez, A. Linkage disequilibrium in cultivated grapevine, Vitis vinifera L. Theor Appl Genet 112, 708–716 (2006). https://doi.org/10.1007/s00122-005-0174-1
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DOI: https://doi.org/10.1007/s00122-005-0174-1