Taking the Chrysanthemum morifoliumm as materials,the effects of GA3 on the flowering and some physiological indexes were studied.The results showed the time of flowering after GA3 treatment were moved ahead for 5 d,the florescence was prolonged for 8 d and the number of small flower was increased for 20.4 % more than those of CK.The water content of petal was increased,the cell membrane relative permeability and MDA content were decreased,the soluble sugar,the activities of POD and CAT were increased durin...