The invention includes a method of transposing a non-autonomous transposon gene of rice (Oryza sativa). The method comprises culturing anthers of rice or treating roots, seeds, leaves, and stems of axillary buds of rice, or a callus derived from them, with 5-azacytidine or 5-azadeoxycytidine. Also included in the invention is a plant or plant seeds produced by the method.