[1] Cornell Univ, Inst Genom Divers, Ithaca, NY 14853 USA
[2] ARS, USDA, Ithaca, NY 14853 USA
[3] Shanghai Jiao Tong Univ, Dept Anim Sci, Shanghai 200240, Peoples R China
[4] Cornell Univ, Dept Plant Breeding & Genet, Ithaca, NY 14853 USA
[5] Nanjing Agr Univ, Ctr Pear Engn Technol Res, Nanjing 210095, Jiangsu, Peoples R China
[6] ARS, US Arid Land Agr Res Ctr, USDA, Maricopa, AZ 85138 USA