Dear Editor,Cucumber (Cucumis sativus L.,2n =2x =14) is an economically important vegetable worldwide and has served as a model system for plant vascular biology and sex determination studies.We reported the draft genome assembly of the North China type cucumber line 9930 in 2009 (Huang et al.,2009a) and constructed a single-base resolution map of cucumber genomic variation by resequencing of the genomes of 115 core germplasm lines (Qi et al.,2013),which enabled genome-wide association studies of important traits in cucumber (Shang et al.,2014).The genome sequences available for cucumber facilitated the development of PCR-based markers and the construction of the genetic linkage maps (Ren et al.,2009;Miao et al.,2011).