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Shuang Jiang, Haishan An, Xiaoqing Wang, Chunhui Shi, Jun Luo, and Yuanwen Teng

central Asia ( Rubstov, 1944 ). Most cultivated pears are assigned to four species: P. pyrifolia , P. ussuriensis , P. × sinkiangensis , and P. communis ( Teng et al., 2002 ). The former three species are oriental pears; the last one is an occidental

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Zhengwang Jiang, Feiyan Tang, Hongwen Huang, Hongju Hu, and Qiliang Chen

. Akihama, T. Hayashi, T. 1998 Incongruence between RFLPs of chloroplast DNA and morphological classification in east Asian pear ( Pyrus spp.) Gene. Resour. Crop Ev. 45 533 539 Kimura, T. Iketani, H. Kotobuki, K. Matsutan, N. Ban, Y. Hayashi, T. Yamamoto, T

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Xingbin Xie, Congbing Fang, and Yan Wang

., 2014 , 2015 ). 1-MCP inhibits CHL activity and maintains green color in vegetables and fruit ( Chen et al., 2009 ; Gong and Mattheis, 2003 ). Recent studies indicate that 1-MCP can delay chlorophyll degradation in asian pears ( Pyrus bretschneideri

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Richard L. Bell

damage to the host plant. Resistance within the genus Pyrus to pear psylla has been demonstrated in the East Asian pear species P. betulifolia Bunge, P. calleryana Decne., P. fauriei Schneid., P. ussuriensis Maxim., and P. × bretschneideri

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Metka Sisko, Branka Javornik, Aleksander Siftar, and Anton Ivancic

., and P. gharbiana Trab.), Asian pea pears ( P. betulifolia Bunge, P. calleryana Decne., P. dimorphophylla Makino, P. fauriei Schneid., and P. koehnei Schneider), and medium-large fruited Asian pears ( P. hondoensis Kik. et Nak., P

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Jorge A. Zegbe and Jaime Mena-Covarrubias

Cactus pear is a Mexican fruit crop cultivated extensively (about 51,000 ha) in the semiarid highlands of central Mexico. This crop has gained economic importance in countries of Europe, America, Asia, and Africa ( Basile, 2001 ). In Mexico, cactus

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Toshihiro Saito, Norio Takada, Hidenori Kato, Shingo Terakami, and Sogo Nishio

with the sugar component. The TSC of Asian pear fruit reportedly varies according to the cultivar ( Abe et al., 1995 ; Kajiura et al., 1979a ; Moriguchi et al., 1992 ). Furthermore, significant parent–offspring correlations or regression coefficients

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Carlos Miranda, Jorge Urrestarazu, Luis G. Santesteban, José B. Royo, and Valero Urbina

Nations, 2010 ). Pyrus communis is the most commonly cultivated pear species in Europe, America, and Africa, whereas Pyrus pyrifolia is the main cultivated species in Asia ( Bell, 1991 ). Worldwide production of P. communis pears is based upon

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Richard L. Bell

-fruited Asian species ( P. betulifolia Bunge, P. calleryana Decne., P. fauriei Schneid., and smaller-fruited P. ussuriensis ) that are also resistant to pear psylla ( Westigard et al., 1970 ). The fruit traits of many of the cultivars and selections used

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Richard L. Bell

within the genus Pyrus to pear psylla has been demonstrated in the East Asian pear species P. betulifolia Bunge, P. calleryana Decne., P. fauriei Schneid., P. pyrifolia (Burm.) Nakai, P. ussuriensis Maxim., and P. × bretschneideri Rehd.; in