种间杂交是植物育种学家把一个物种的基因向另一个物种转移的常用技术。由于种间植物比种内植物亲缘关系疏远,常使种间杂交遗传障碍加大,于是获得种间杂种要比获得种内杂种困难。只有当用种内杂交得不到某种性状,或某种性状表现不理想时,育种学家才借用种间杂交。为了培育出新的李属品种和砧木。核果育种学家广泛采用了种间杂交,特别是在李亚属上;因为李亚属比其它亚属易 Interspecific hybridization is a common technique used by plant breeders to transfer genes from one species to another. As interspecific plants are more distantly related to their species, genetic barriers to interspecific hybridization often increase, making interspecific hybrids more difficult than obtaining intraspecific hybrids. Breeders use genetic crosses only if they do not have access to a trait, or do not perform well in a trait. In order to breed new varieties of prunus and rootstocks. Species crossbreds are widely used by drupe breeders, especially in the genus Liam, because the genus Liam is easier than other subgenus