Functional characterization of gibberellin oxidases from cucumber, Cucumis sativus L.

► Sixteen putative GA-oxidases were identified in cucumber. ► Phylogenetic analysis distributed them into four groups (7-, 20-, 3-, and 2-oxidases). ► Members within the 7- and 2-oxidase groups have different enzymatic function. ► Members within the other two groups are functionally similar.