As shown in Fig. 5, in Exp-1, the IAA, GA3and ZR contents ofthe leaves were significantly higher in WT and WN than in DT andDN, but the ABA content was significantly lower in WT and WNthan in DT and DN during the drought stress period. These findingsshowed that drought stress reduced the IAA, GA3and ZR contentsbut increased the ABA content of leaves. At 5 days and 10 days after increased the ZR concentration of leaves and root-to-leaf deliveryrate either by xylem sap or transpiration. However, rewatering hadlittle effect on the ABA root-to-leaf delivery rate.