Large amount of viable mesophyllprotoplasts were isolated enzymaticallyfrom onion(Allium cepa L.).The pro-toplasts grew and divided when culturedin thin liquid layers of MS mediumwith 2,4-D 2,6 BA 0.5 mg/1,mannitol0.5 M,sucrose 2%.Calli were subcultu-red on MS medium without mannitol.After transferring to modified MS me-dium(MS_1,MS_2,MS_3)calli regeneratedbuds or bulblets and regenerated plant-lets had been obtained.