Abstract: Infloresccnces of hyacinth after emerged from the soil surface at different height were used. Cut the inflorescences into different parts: peduncle, rachis, pedicel and flower bud. Then cut them into suitable pieces. In vitro culture, the effect of hormones on the regeneration of bulblets on the inflorescence explants was investigated. When the culture medium was basal medium without hormones, only small bulblet primordia(about 1 mm in length) regenerated at the basal end of the rachis segments. If NAA or BA added to the medium separatily, the bulblets were rarely regenerated.When NAA and BA added together to the basal medium and the amount of NAA is less than that of BA, the bulblets are differentiated from explants. The explants of perianth and ovary require higher amount of auxins than that of rachis, pedicel and peduncle.

Key words: effect, hormones, germination, growth, inflorescence