Establishment of a High-efficiency Genetic Transformation System of Cucumber (Cucumis sativus) using Csexpansin 10 (CsEXP10) Gene.

Cucumber is one of the most important vegetable crops in the world. To establish an efficient genetic transformation system in cucumber, the role of different factors such as pre-cultivation time, acetosyringone concentration, infection time and cocultivation time that can influence the transformation, was evaluated. In addition, Csexpansin 10 (CsEXP10) gene was transformed into the cucumber genome to produce transgenic lines. The results showed that various optimal parameters such as 100 mg L-1 of kanamycin concentration for selection of transformants, 2 d of pre-cultivation time, 100 μmol L-1 of acetosyringone concentration, 15 min of infection time and 2 d of co-cultivation time were obtained using cotyledonary node explants. The rooting frequency observed on Murashige and Skoog (MS) medium supplemented with 0.2 mg L-1 indole acetic acid and 400 mg L-1 cefotaxime was found to be 100.00%. The positive transgenic cucumber lines were identified using PCR analysis and GUS staining assay. It suggests that the genetic transformation system developed using cotyledonary node explants is efficient and successful in cucumber. [ABSTRACT FROM AUTHOR]