Genome sequencing and assembly of pear [(Pyrus ussuriensis × communis) × spp.]

'Zhongai 1' is a very good resources for the breeding of dwarfing rootstock and dwarf cultivar, but it is hard to root, only can be used as inter-stock, and its dwarfing and dwarf mechanism are unclear yet. For the efficient breeding of new Pyrus rootstocks and dwarf cultivrs, it is crucial to understand the molecular mechanism of vigour control and precocity, assembling a high quality genome for this rootstock will be helpful to clear that.