Self-incompatibility (S) genotypes of cultivated sweet cherries – An overview 2017

The fertility in sweet cherry is determined by a gametophytic self-incompatibility system, controlled by a multi-allelic S-locus who prevents self-pollination. The fertilization is determined by the interaction of an S-allele specific ribonuclease (S-RNase) in the style with a pollen S specific F-box protein gene (SFB). Knowledge about the S genotype of sweet cherries is very important for cherry growers and breeders. In the last years molecular markers have been developed to distinguish the S- alleles in sweet cherries. A total of 60 incompatibility groups in 1203 sweet cherries have been defined up to October 2017. 25 sweet cherries have a unique combination of S-alleles and were described as universal donors and placed in the incompatibility group 0. Additionally, there exist 72 self-compatible sweet cherries, called group SC.

The goal of this work is to summaries all known data of the S-alleles in cultivated sweet cherries. In Table 1 the S-genotypes of all studied sweet cherries are described. Furthermore it includes information about the parentage if they are known.
Table 2 gives an overview about all the detected incompatibility groups. The groups are sorted according to the group numbers and the S-allele numbers, respectively.
In Table 3 all genotypes of the incompatibility group 0 with a unique S-genotype are listed.
Table 4 includes all known self-compatible sweet cherries.
All references to the information of the S-genotypes are listed in a file named 'References'.

The present overview needs to be further improved with all new S-alleles data of sweet cherries. In addition, all new information about the parentage is very important for the breeding research. Please send all new or corrected data to the S-alleles and the parentage of sweet cherries to [e-mail]. An update of the S-allele overview will take place every year.