Abstract: Pear is a typical self-incompatible fruit tree. Its yield is low and quality is bad under natural pollination conditions. The approach of overcoming self-incompatibility, increasing production and improving quality could be found through identification of pear S genotype. The new germplasm Jinzhuguo is selected from wild Pyrus pyrifolia(Burm.f.)Nakai. Young leaves of Jinzhuguo pear was selected as materials, and special PCR, cloning, DNA sequencing and analysis of biological information were carried out with its genomic DNA. As a result, the S-genotype of Jinzhuguo pear was identified as S₃ S₁₉.

Key words: Jinzhuguo pear, self-incompatibility, S-genotype