EN
In vitro somatic embryogenesis and organogenesis (shoot and root formation) were observed when immature zygotic embryos of the sunflower cultivars Frankasol, Printasol, Lech and Wielkopolski were cultured on JME medium containing high sucrose concentration (350 mM). Of four tested cultivars, Frankasol showed the highest rate of somatic embryogenesis, and Printasol the highest rate of organogenesis. The remaining two cultivars responded slightly.