With two years growth Guzmania 'Amaranth' [G.wittmackii(André) André ex Mez×G.lingulata(Linnaeus) Mez] from tissue culture as materials,we studied the effects of 4 calcium regulators(A23187,W-7,TFP,EGTA) on the floral buds differentiation and contents of endogenous hormones of Guzmania 'Amaranth' under exogenous ethylene treatments.The results showed that the contents of ZR and IAA increased with varying degrees along with the process of flower bud differentiation under different treatments.The rate of incr...