The transformation of Phaffia rhodozyma by electroporation was better
than the one by the lithium chloride (LiCl) or spheroplast transformat
ion methods. The influence of several parameters on transformation eff
iciency was studied. Electroporation conditions of 1200 Volts, 50 mu F
arads and 2000 Ohms were proved successful. A maximum of 1.5 x 10(3) t
ransformants per 100 ng of DNA was reached.