大山楂(Crataegus Pinnatifida Bge.Var.major NE.Br.)为山楂(CrataegusPinnalifida Bge.)的变种,各地作为果树栽培的都以此变种为主。该变种种胚发育成熟的比率极低,难以得到实生苗,即便是得到实生苗,因其遗传性的不稳定,也不能保持原品种的优良性状。因此,一般都是以野生山楂或山楂实生苗为砧木嫁接大山楂接穗来繁殖。而嫁接需要培育大量砧木和要求熟练的嫁接技术,费工,费时、又不 Crataegus Pinnatifida Bge.Var.major NE.Br. is a variety of CrataegusPinnalifida Bge. The varieties are mainly cultivated in fruit trees all over the world. The variety of mature embryo development rate is very low, it is difficult to get seedlings, even if the seedlings are obtained, because of its hereditary instability, can not maintain the original varieties of fine traits. Therefore, the wild hawthorn or hawthorn seedlings are generally grafted as the rootstock grafted hawthorn spike to breed. The grafting needs to cultivate a large number of rootstocks and require skilled grafting techniques, labor, time-consuming, and not