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Pyrus × bretschneideri
''Pyrus'' × ''bretschneideri'' (or ''Pyrus'' ×''bretschneideri''), the ya pear or pearple or Chinese white pear (白梨 bái lí), is an interspecific hybrid species of pear native to northern China, where it is widely grown for its edible fruit.
Recent molecular genetic evidence confirms some relationship to the Siberian pear (''P. ussuriensis''), but it can also be classified as a subspecies of the Chinese pear (''P. pyrifolia'').
Along with cultivars of ''P. pyrifolia'' and ''P. ussuriensis'', the fruit is also called the nashi pear.〔(NSW Primary Industries 2002. ''Nashi asian pear varieties''. Agfact H4.1.14 )〕These very juicy, white to light yellow pears, unlike the round Nashi pears (''P. pyrifolia'') that are also grown in eastern Asia, are shaped more like a European pear, narrow towards the stem end. “Ya Li” (鸭梨, pinyin yā lí), literally translated as "Duck Pear" due to its mallard-like shape, is one cultivar widely grown in China, and exported around the world. Ya pears taste similar to a mild Bosc pear, but are crisp, with a higher water content and lower sugar content.
==Further hybridization==
Breeding programs have created cultivars that are the products of further hybridizing ''P.'' ×''bretschneideri'' with ''P. pyrifolia''. Under the International Code of Nomenclature for algae, fungi, and plants, such backcross hybrids are named within the species ''P.'' ×''bretschneideri''.〔 Article H.4〕 Cultivar 'PremP109', also called 'Prem 109' is such a hybrid, marketed under the trademark Papple.〔(【引用サイトリンク】title=Papple TM brand Pears )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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