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Isolation and characterization of new polymorphic simple sequence repeat loci in grape (Vitis vinifera L.)
New simple sequence repeat (SSR) DNA markers effectively identify grape varieties. These SSR markers provide high resolution for grape DNA typing and genetic analysis, aiding in accurate Vitis vinifera identification.
Area of Science:
- Genetics
- Molecular Biology
- Horticulture
Background:
- Accurate identification of grape (Vitis vinifera) cultivars is crucial for legal, economic, and genetic purposes.
- Simple sequence repeat (SSR) markers offer high polymorphism for DNA typing but require characterization of new loci for improved resolution.
Purpose of the Study:
- To characterize four novel SSR loci (VVMD5, VVMD6, VVMD7, VVMD8) in grape.
- To assess the utility of these SSR loci for distinguishing between 77 Vitis vinifera cultivars.
Main Methods:
- DNA was extracted from 77 Vitis vinifera cultivars.
- Four new SSR loci were amplified and analyzed using silver staining.
- Allele sizes and frequencies were determined for each SSR locus.
Main Results:
- Amplification products ranged from 141 to 263 bp, with 5-11 alleles per locus.
- Silver staining allowed discrimination of alleles differing by 1 bp.
- All cultivars were distinguished except for known synonyms or variants, highlighting the markers' discriminatory power.
Conclusions:
- The characterized SSR loci are highly polymorphic and effective for grape cultivar identification.
- Increased resolution for grape DNA typing can be achieved with a larger number of SSR loci.
- International sharing of SSR marker data will enhance their utility in grape genetic analysis and identification.
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