Common Name

Pyrus betuleafolia is a wild species native to China, and it is widely distributed in the northern region and bears small fruit with a diameter of ~1 cm and two carpels . The plants of this species show characteristics of a well-developed root system, vigorous growth, tolerance to several abiotic and biotic stresses and excellent affinity for Occidental and Oriental pear cultivars . With these peculiarities, P. betuleafolia is widely used as a rootstock in northern China. Pyrus betuleafolia was believed to be an ancestral species linked to Oriental and Occidental pears.

The de novo assembly of the genome of P. betuleafolia-Shanxi Duli using an integrated strategy that combines PacBio sequencing, BioNano mapping and chromosome conformation capture (Hi-C) sequencing. The genome assembly size was 532.7 Mb, with a contig N50 of 1.57 Mb. A total of 59 552 protein-coding genes and 247.4 Mb of repetitive sequences were annotated for this genome.

Sequencing Platforms              PacBio+Bionano+Hi-C

 Assembly Level                       Chromosome

Estimated Genome Size           511Mb

Assembled Genome Size         532.7Mb

Scaffold N50                            28.1Mb

Contig N50                              1.57Mb

Gene Number                          59552

Dong, X., Wang, Z., Tian, L., Zhang, Y., Qi, D., Huo, H., Xu, J., Li, Z., Liao, R. and Shi, M. et al.. (2020) De novo assembly of a wild pear (Pyrus betuleafolia) genome. PLANT BIOTECHNOL J, 18, 581-595.