Effects of Different Exogenous Hormones Treatment and Soaking Time on the Graft Survival Rate and Growth of Gleditsia Sinensis
To study the effects of exogenous hormone treatment on the graft survival rate and growth of Gleditsia sinensis,3-year-old Gleditsia sinensis seedlings with the same origin were used as the stock and the current-growth branches of the ex-cellent variety were used as the scion.The results showed that 6-BA concentration of 40 mg/L～60 mg/L,KT concentra-tion of 40 mg/L～60 mg/L and IBA-K concentration of 30 mg/L～120 mg/L had a better promoting effect on the survival and growth of Gleditsia sinensis grafted seedlings,while the effect of GA3 treatment was slightly worse than the other 3 hor-mones.The combination treatment of 50 mg/L 6-BA,40 mg/L KT and 120 mg/L IBA-K had the highest grafting sur-vival rate of Gleditsia sinensis which reaching 95.56％.That had the most significant promotion effect on the growth of graf-ted seedlings,which the average seedling height increased by 30.48％and the average base diameter increased by 29.91％compared to the control.The soaking time of Gleditsia sinensis scions whether too short or too long could affect the grafting effect.The suitable soaking time was 5 min～20 min.
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