Determining self-incompatibility genotypes in Belgian wild cherries

Area of Science:

• Plant genetics
• Molecular biology
• Population genetics

Background:

• Self-incompatibility (S) systems are crucial for regulating cross-pollination in flowering plants.
• Understanding S-genotypes in wild cherry (Prunus avium) is essential for breeding and conservation efforts.
• Previous studies have characterized S-alleles in cultivated sweet cherry, but less is known about wild populations.

Purpose of the Study:

• To determine the self-incompatibility (S) genotypes of 65 Belgian wild cherry accessions.
• To identify novel S-alleles in wild cherry populations.
• To compare S-allele frequencies between wild cherry and cultivated sweet cherry.

Main Methods:

• DNA extraction from wild cherry accessions.
• Polymerase chain reaction (PCR) amplification using consensus and allele-specific primers targeting S-ribonuclease gene introns.
• Partial sequencing of putative new alleles.
• Genotyping of 65 individuals and analysis of allele frequencies.

Main Results:

• Seventeen distinct S-alleles were detected in the wild cherry collection, including six newly identified alleles (S17-S22).
• One triploid individual was identified among the accessions.
• Significant differences in S-allele frequencies were observed between wild cherry populations and sweet cherry cultivars, with S4 and S5 absent in wild cherries.
• Allele frequencies varied between samples, and the total number of alleles in the underlying populations was estimated.

Conclusions:

• The study successfully characterized S-genotypes in Belgian wild cherry, revealing novel alleles and population-specific frequency distributions.
• The findings provide valuable data for managing gene flow within seed orchards and for conservation strategies of wild cherry.
• The PCR-based approach is effective for S-genotyping and can be applied to other wild populations.