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A microsatellite marker based framework linkage map of Vitis vinifera L
S Riaz1, G S Dangl, K J Edwards
1Department of Viticulture and Enology, University of California, One Shields Avenue, Davis, CA 95616, USA.
Summary
Researchers developed a genetic map for European wine grapes (Vitis vinifera) using microsatellite markers. This new reference map aids in understanding grapevine genetics and breeding for improved wine quality.
Area of Science:
- Genetics
- Genomics
- Plant Science
Background:
- Vitis vinifera L., the European wine grape, is a vital agricultural crop.
- Developing a high-density genetic map is crucial for understanding its complex genome and for breeding programs.
Purpose of the Study:
- To construct a framework linkage map for Vitis vinifera using microsatellite markers.
- To establish a reference map for the International Grape Genome Program.
Main Methods:
- A mapping population of 153 progeny from a Riesling x Cabernet Sauvignon cross was utilized.
- 152 microsatellite markers and one EST marker were mapped to 20 linkage groups.
- Genome size, expected, and observed genome coverage were estimated using 135-140 markers.
Main Results:
- A linkage map covering 1,728 cM with an average marker distance of 11.0 cM was constructed.
- The map comprises 20 linkage groups (2n=38).
- Observed genome coverage was approximately 65%, lower than the expected 90%; no significant differences in meiotic recombination rates were found between parents.
Conclusions:
- The developed microsatellite-based linkage map serves as a valuable reference for Vitis vinifera genetics.
- This map facilitates future genetic studies and marker-assisted breeding in grapevines.
- The findings contribute to the International Grape Genome Program's objectives.