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The breakdown of self-incompatibility, which could result from the accumulation of non-functional  S -haplotypes or competitive interaction between two different functional  S -haplotypes, has been studied extensively at the molecular level in tetraploid Rosaceae species. In this study, two tetraploid Chinese cherry ( Prunus pseudocerasus ) cultivars and one diploid sweet cherry ( Prunus avium ) cultivar were used to investigate the ploidy of pollen grains and inheritance of pollen- S  alleles. Genetic analysis of the  S -genotypes of two intercross-pollinated progenies showed that the pollen grains derived from Chinese cherry cultivars were hetero-diploid, and that the two  S -haplotypes were made up of every combination of two of the four possible  S -haplotypes. Moreover, the distributions of single  S -haplotypes expressed in self- and intercross-pollinated progenies were in disequilibrium. The number of individuals of the two different  S -haplotypes was unequal in two self-pollinated and two intercross-pollinated progenies. Notably, the number of individuals containing two different  S -haplotypes ( S 1  - and  S 5  -,  S 5  - and  S 8  -,  S 1  - and  S 4  -haplotype) was larger than that of other individuals in the two self-pollinated progenies, indicating that some of these hetero-diploid pollen grains may have the capability to inactivate stylar S-RNase inside the pollen tube and grow better into the ovaries.

Inheritance of Hetero-Diploid Pollen S-Haplotype in Self-Compatible Tetraploid Chinese Cherry (Prunus pseudocerasus Lindl)