Abstract: Immature embryos of maize (Zea mays L.) were aseptically excised and cultured on Murashige and Skoog (MS) media containing four different Abscisic Acid (ABA) concentrations (Control 0.0, 0.1, 1.0 and 10.0 mg L-1). The ABA effects on the germination of cultured embryos, number of leaves per plant, plant height, percentage of dry matter and protein expression for plants regenerated from ABA treated embryos were studied. Effects of ABA on germinating embryos were found to be associated with time; it reduced the germination during the first week. ABA affected the percentage of dry matter significantly.