Biological characteristics and contents of secondary metabolites(chlorogenic acid,total flavonoids) of 10 clones of Eucommia ulmoides were investigated.The clone with purple leaves has purple blade with green midrib on the adaxial side,green blade on the abaxial side and graceful crown.The clone of clump leaves is endowed with tightly dense crown with unique shape.Therefore,both of the clones are good materials suitable for being used as ornamental tree.Additionally,the clone with purple leaves possessed high contents of chlorogenic acid and flavonoids,which made it also proper to herbal medicine use.We propose that the clone should be set as a model and spread in the main production area of E.ulmoides and garden scenic area because of its medicinal and ornamental value.
Reproductive techniques for the new variety Qinzhong No.1～4 of Eucommia ulmoides were studied to resolve the bottleneck problem of being difficult to be cultivated in large areas.These problems are mainly lie in difficult rooting in cutting and tissue culture propagation,material deficiency in root burying propagation,low survival rate of branch grafting and budding in spring etc.A new propagation method of budding in Eucommia ulmoides was summarized in this study.Higher propagation coefficient and survival rate was achieved by using this budding method on the propagation of Qinzhong No.1～4(the survival rate was up to 97%).Effect of variety improvement and large tree crow can be achieved by cutting the mature tree(10～13 a)and budding with the new propagation method.In July of the second year after grafting,the new shoot biomass can be up to 135.4 cm and the tree crow can be 105.6 cm.
