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Sucrose synthase (SUS) comprises a family of enzymes which play pivotal roles in plant development, carbon partitioning and sink strength.A total of 11 SUS genes were identified in apple genome.Phylogenetic analysis revealed that the SUS genes were divided into three groups, designated SUS1, SUS2 and SUS3.The SUS1 and SUS4 group include four homologs respectively, whereas SUS2 group consists of three homologs.