Polyploidization in egg-plant has been tried through colchicine treatments in seeds of the cultivar Santa Genebra from Instituto Agronômico. Several trials were made varying the strenght of the solution, the duration of the treatment and the time of its application, that is, before, during, and after seed germination. Chromosome numbers determined in roots as well as the number of stomata of treated material compared to those of original diploid one, indicate that complete polyploidization was not achieved. Instead, chimeric plants either in aerial part or in the roots were detected, that resulted from treatment of seeds in germination and from those stronger treatments (0.4 and 0.6%) applied before germination.