Pyrus All Species

            As a member of the Rosaceae family and the subfamily Maloideae, pear has a wide range of germplasm resources and an ancient cultivation history.There are at least 22 known Pyrus species, with over 5000 accessions that are either cataloged or maintained around the world. These accessions have wide morphological and physiological variability and different ecological adaptations. Among these species, P. communis is mostly cultivated in Western countries, while P. pyrifolia, P. bretschneideri, P. ussuriensis, and P. × sinkiangensis are primarily cultivated in Asian countries.

         Pear has a basic chromosome number of 17 (2n = 34). Different pear species have distinctly different genome sizes, ranging from 500 to 650 Mb, and possess high numbers of repeats and transposable elements (TEs), as well as high levels of heterozygosity.

Genome Assemblies         6

Chromosome Number    n=34

 Ploidy                                Diploid