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2009年在山东沂蒙山区梨野生资源调查中发现梨属矮生型变异株系,通过枝接方式嫁接在青岛农业大学试验站6年生豆梨砧木成年大树上。多年实地调查以及对转接材料植物学性状和生物学习性观察结果表明:该变异株树形紧凑,枝条节间极短,与普通杜梨差异明显;在连续转接多次后矮生性状能够稳定保持,病毒学检测无明显异常;除节间短外,在枝条的绒毛、果实形状、叶片等方面与杜梨和豆梨存在明显差异,并依据田间调查编号命名为‘PY-9’。这一梨属矮生资源材料的发现,为今后梨矮生机制研究及砧木矮化育种提供了宝贵的优异种质材料。
In 2009, Yili Mountain pear resources survey found pear pear dwarf mutant strains, grafted by grafting in Qingdao Agricultural University Experimental Station 6-year-old pea rootstock adult tree. Years of field surveys and observations on the botany and biological habits of the redirected material showed that the mutant was very compact in tree shape with extremely short internodes and markedly different from that of common pear. After many successive transfers, In addition to the short internodes, there were significant differences in the villi, fruit shape, and leaf shape of the branches between Pear and Pear, and was named “PY-9” according to the field survey number. The discovery of this pear-shaped dwarf resource material provides precious excellent germplasm material for the future research on dwarfing mechanism of pear and stock dwarfing.