为适应梨树集约化栽培的需要,一些国家提出了矮化株型的育种目标。根据我们的研究,梨的株型大致分为乔化普通型(简称乔化型)、矮化衰弱型(简称衰弱型)、开张短枝型和紧凑矮壮型(简称紧凑型),后二种是梨矮化育种所要求的株型。研究表明,紧凑型梨具有新梢短、尖削指数和粗长比大、节间短、叶片气孔密度小的特点。 In order to meet the needs of intensive cultivation of pear trees, some countries have proposed dwarf plant type breeding objectives. According to our research, pear plant types are roughly divided into Qiaohua ordinary type (referred to as Qiao-type), dwarfing weak type (shortening type), open spur type and compact short form (referred to as compact), the latter two Pear dwarf breeding species is required for plant type. Studies have shown that compact pear with short shoots, sharp cut index and coarse to large ratio, short internodes, leaf stomatal density is small.