Effects of Different Grafting Methods on Scion Survival Rate and Shoot Growth of Castanopsis sclerophylla
To explore the methods of grafting survival rate and new shoot growth of Castanopsis sclerophylla,two-year-old seedlings of common C.sclerophylla were used as rootstocks.Grafting was conducted using scions from ten clonal lines of C.sclerophylla through top-cut grafting,side-budding grafting and side-branch budding grafting methods.The survival rate of the grafted scions and shoot growth were assessed 8 months after grafting.The results indicate that the survival rate of scions across different grafting treatments was ranked as follows:amputate rootstock-cleft grafting method(86.06％)＞rootstock stem budding method(74.93％)＞rootstock branch budding method(72.47％).The scion survival rate for the amputate rootstock-cleft grafting method was significantly higher than that of the other two grafting methods(p＜0.05).The grafting survival rates of different clones in descending order were:JO19,GZ18,JO07,JO21,GZ06,GZ11,JO15,GZ30,JO01 and GZ08,with JO19(82.23％)being the highest,followed by GZ18(79.32％),which was significantly higher than GZ08(71.40％)(p＜0.05).The order of new shoot growth for different grafting treatments was as follows:rootstock branch budding method(37.64 cm)＞rootstock stem budding method(36.71 cm)＞amputate rootstock-cleft grafting method(32.81 cm).The method of grafting side buds onto rootstocks is significantly higher than the other two methods(p＜0.05);The new shoot lengths of different scion clones in descending order were:GZ08,JO01,JO15,GZ11,JO19,JO07,GZ18,JO21,GZ06 and GZ30,among them,GZ08(38.78 cm)is significantly higher than GZ30(32.83 cm)(p＜0.05).Therefore,when grafting clonal scions of C.sclerophylla to improve the survival rate,priority should be given to the top-cut wedge grafting method with rootstocks;to enhance the growth of new shoots,the side bud approach on rootstocks should be prioritized to improve seedling quality and propagation efficiency.
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