Cucumber (Cucumis sativus L.) is one of the staple vegetables and very popular for consumers. Cucumber breeding keeps attracting breeders' attention and there are numerous commercial varieties were bred by making use of the heterosis, which is the prime approach for cucumber improvement. However, up to now, less attention was put on how to predict the heterosis about the cucumber F_1 hybrid in early stage.In order to predict the cucumber heterosis in early stage and promote new varieties breeding, two cross...