Abstract: The objective of this study is to determine the effects on the changes of endogenous hormones in apple seedlings by direct planting,top grafting,and grafting on dwarfing intermediate stock respectively. During May to September the apple seedlings of Guohong Changfu 6 by three different grafting methods were selected once per month as the test materials,which included direct planting , top grafting , and grafting on dwarfing intermediate stock. The changes of endogenous hormones' content and their ratios in these apple seedlings leaves were studied on this paper and the results were detected by HPLC in Shijiazhuang Pomology Institute,Hebei Academy of Agriculture and Forestry Sciences. The results showed that by uses of top grafting and grafting on dwarfing intermediate stock,the content of GA3,IAA , CTK in those leaves are lower than that in the leaves by the direct planting trees , but the content of ABA is higher than that in the direct planting trees. The results indicated some plus or minus relevance by the three different grafting methods,and it also provided theoretical evidence for the influence on the different grafting methods shortening the juvenility of apple seedlings.

Key words: Apple, Seedlings, Grafting, Endogenous hormones

CLC Number: 

• S661.01

• S616