The article investigated the changes of nutrients(total sugar,total nitrogen,total sugar/total N)and oxidases(IAAO,POD,PPO)of Catalpa bungei cl.’Yu-1’ in the cutting rooting process.The results showed that:C.bungei cl.’Yu-1’ cutting rooting initiated from the lenticel.The soluble protein in the forced-sprouting cuttings decreased dramatically in the early stage,and then the decrease tended to slow.The total sugar content slowly increased throughout.The total nitrogen had a little change.The total sugar/total nitrogen ratio had same trend with total sugar.The IAAO,PPO activity of the forced-sprouting cuttings showed up-down-up-down pattern in the rooting process,The POD activity rose in undulation pattern.The role of three oxidases was both independent with each other,and related to one another in the process of rooting by which affected rooting in integration.
