The ultrastructural research of floral bud differentiation in thin cell layer cul-ture of flower stalk of Cichorium intybus revealed that the mitochondria, Golgi bodies,rough endoplasmic reticulum (RER) increased significantly during the floral bud forma-tion. The mitochondria which were dividing into two were observed in various periods of floral buds differentiation. It was probable that the increased mitochondria supplied ener-gies for the RER and Golgi bodies to synthesize the structural and functional ...