大约在80年前,美国科学家在苹果不定芽萌发出的植株上,发现一种特殊的芽变系。这种芽变树体矮小,在同样的生长条件下,其树体比起源品种小1/3,很容易长成自然圆锥形小树冠。枝类组成中,骨干枝少,直立而集中,新梢短而粗,节间短、较直立。单位长度上叶数多,生长缓慢,树姿紧凑。所以称其为短枝型,经过多年的选育,目前短枝型品种已达100多个,由于在生长结果习性方面的某些共性,因而通常把它们归为一个品种群。 About 80 years ago, scientists in the United States adventitious buds of apple plants found on the emergence of a special strain of germ. This shoot becomes a short tree, and under the same growth conditions, its tree is one-third smaller than the original variety and easily grows into a natural conical crown. Branches composed of branches less backbone, upright and concentrated, short and thick shoots, internodes short, more upright. Number of leaves per unit length, slow growth, Shuzi compact. So called spur type, after years of breeding, the current spur-type varieties have reached more than 100, due to some commonalities in the habit of growth and therefore they are usually classified as a breed.