A 48 SNP set for grapevine cultivar identification.

Area of Science:

• Genetics
• Plant Science
• Bioinformatics

Background:

• Accurate grapevine cultivar identification is crucial, complicated by historical synonymy and homonymy.
• Simple sequence repeat (SSR) markers have been standard but have limitations.
• Single nucleotide polymorphism (SNP) markers offer potential for high-throughput, automated genetic identification.

Purpose of the Study:

• To develop and validate a standardized set of SNP markers for grapevine genotyping.
• To establish a reliable method for grapevine cultivar identification using SNP markers.

Main Methods:

• Re-sequencing of 11 grapevine genotypes to identify over 300 SNPs.
• Selection of 48 stable SNP markers with balanced allele frequencies across all chromosomes.
• Testing marker stability and discriminatory power using worldwide grapevine cultivars.

Main Results:

• Identified and selected 48 SNP markers suitable for grapevine genetic identification.
• Demonstrated uniform genome distribution (2-3 markers/chromosome) and high discrimination power.
• Validated marker stability across repeated analyses and diverse cultivars.

Conclusions:

• A standardized set of 48 SNP markers is proposed for grapevine (Vitis vinifera L.) genotyping.
• SNP markers eliminate ambiguity associated with SSR allele sizing and inter-laboratory comparisons.
• SNP markers provide simple, highly comparable, and automated genotype identification.