Fruit crop 基本例句 果树 Peach is a kind of the perennial fruit crop. For it's long period of a generation, molecular genetic mapping is very important theoretically and practically in breeding. 桃属于多年生果树植物，由于世代周期长及其高度杂合性，使分子遗传作图不仅在理论上而且在育种实践上有十分重要的意义和价值。 fabiao