A new compound, Surflan (Surflan), for mitotic polyploidization in vitro in lily was tested and compared with the original compound ‘oryzalin’. Surflan was effective for mitotic polyploidization of lilies. The optimal concentration of Surflan was 0.0075% for in vitro chromosome doubling. A low concentration (0.0025%) was still effective to produce polyploid plants, however, a high concentration...