Book excerpt: This edited book presents the latest research on cucumber, its genetic resources and diversity, tissue culture and genetic transformation, mapping of economic genes and QTLs, whole genome sequencing, comparative genomics, and breeding strategies. The mechanism of sex expression, interspecific hybridization, and cell biology are also described. The book discusses the genome draft of cucumber and the application of genome editing. This book is useful to the students, teachers and scientists in academia and relevant private companies interested in horticulture, genetics, breeding, and related areas.