Simple sequence repeat-based assessment of genetic relationships among Prunus rootstocks

Area of Science:

• Genetics
• Plant Science
• Molecular Biology

Background:

• Understanding genetic diversity in cherry rootstocks is crucial for developing improved cultivars.
• Prunus species, including P. avium, P. cerasus, P. mahaleb, and P. angustifolia, are vital for the cherry industry.
• Simple sequence repeat (SSR) markers offer a powerful tool for assessing genetic relationships.

Purpose of the Study:

• To investigate the genetic relationships among 23 cherry rootstock candidates and related Prunus species.
• To evaluate the informativeness of ten SSR loci for differentiating cherry genotypes.
• To assess the applicability of SSR analysis for phylogenetic studies within the Prunus genus.

Main Methods:

• Analysis of ten SSR loci across 23 rootstock candidates and five P. laurocerasus genotypes.
• Microsatellite genotyping and assessment of allele numbers and heterozygosity.
• Clustering analysis, including unweighted pair-group method with arithmetic mean (UPGMA), to determine genetic relationships.

Main Results:

• SSR markers were highly informative, with a mean of 9 alleles per locus and high heterozygosity (0.61).
• Clustering analysis identified two main genetic clusters, largely consistent with botanical species.
• P. avium and P. cerasus formed a distinct subcluster, while P. mahaleb and P. angustifolia formed another. P. laurocerasus showed less genetic variation.

Conclusions:

• SSR analysis effectively differentiates cherry rootstock candidates and confirms taxonomic relationships within the Prunus genus.
• The findings suggest SSR markers are valuable for genotyping and constructing phylogenies in Prunus.
• This genetic information can guide the selection of rootstocks for specific cherry breeding objectives.