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From which species does the apple-pear originate?
About the classification status of apple pear, for many years there has been disagreement. Morphology due to the apple pear both white pear certain characteristics, such as fruit yellow-green, yellow after storage, sunshade red halo, leaf blade acuminate, new tip orange-red, etc.; At the same time, there are some characteristics of the sand pear, such as shape oblate-orbicular, sepals off between or persistent, leaf blade more ovoid, etc.. Therefore, Pu Fu Shen (1959), Yu Dejun (1979), Wang Yulin (1988) and others in the work of the apple pear is classified as sand pear system, mainly based on the apple pear has sand pear system of blood, such as Wang Yulin according to the shape of the apple pear fruit, storage performance, and its natural pollination of the hybrid progeny of the fruit skin color separation of the situation, that this variety may be Japanese pear "Imamura autumn" and autumn pear hybrids; later Po Fu Shen (1988, 1989), Wu Kengmin (1984) and others will be categorized as white pear system, of which Po Fu Shen and others mainly based on the apple pear although sand pear system of blood, but its fruit morphology characteristics and the white pear system of varieties similar to the white pear system, it is classified into the white pear system. Gu mode according to the apple pear cold resistance is significantly stronger than the white pear and its place of origin of the north green is a hybrid pear production area in the north of Gangwon province, North Korea, that it may be a variant of the sand pear system and the autumn pear natural hybrids.

Qu Baihong et al. (2003) applied peroxidase isoenzyme technology to classify 56 varieties and types of four systems of pear germplasm resources, namely, Akizi Pear, Sand Pear, White Pear, and Western Pear, and explored the taxonomic status of Apple Pear. The results showed that, from the peroxidase isozyme clustering diagram as well as the comparison of similarity coefficients, the apple pear clustered with the bud varieties Dongning No. 5 large pear and Qixia large perfumed pear, and then clustered with most of the varieties in the white pear system, therefore, it is considered that the apple pear has a great deal of similarity with the white pear system in terms of genetic relationship.

From the varietal clustering diagram can also be seen, apple pear and its bud varieties clustered together, first with the white pear system of the representative varieties of duck pear, Qinglong sweet, and its hybrids with the white pear, therefore, from the molecular point of view of the classification of the apple pear in the pear genus, it is considered that it is classified as a white pear system is more appropriate.