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我国是世界梨树重要的起源中心之一,栽培历史在2,000年以上。原产13个种,栽培品种千余个,其中有许多是珍贵的名产品种和重要的种质资源。经过染色体倍性鉴定的有9个种,其中6个为二倍体,1个为三倍体,2个有多倍体类型。至于栽培品种芽变的组织学和细胞学,至今未见报道。 鸭梨是白梨(Pyrus breischneidri)的代表品种,也是我国历史悠久的名产品种之一。1973年以来,在河北省晋县、赵县、巨鹿、孟村回族自治县以及邯郸市等地,先后发现了鸭梨的大果型芽变。其变异性状,除果大外,还表现叶大而厚,花大,籽少,具
China is one of the most important centers of origin of the world pear tree, with a history of cultivation of more than 2,000 years. 13 species of origin, more than a thousand varieties of cultivars, many of them are precious species and important germplasm resources. After the ploidy identification of 9 species, of which 6 were diploid, a triploid, two polyploid type. As for the cultivars budding histology and cytology, has not been reported. Pear is the representative variety of Pyrus breischneidri and is also one of the oldest species in China. Since 1973, large-scale bud transformation has been found in Jinxian County, Zhao County, Julu County, Mengcun Hui Autonomous County and Handan City in Hebei Province. Its variation traits, in addition to large fruit, but also the performance of large and thick leaves, flowers, seeds less, with