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Summary:Michelia（Michelia figo（Lour.） Spreng.） Also known as banana flower,with the character of elegant,Four Seasons evergreen, Fragrant Flowers attacks,is one of valuable ornamental tree species.The smile seed is small and seed germination rate is low,so it is real obstacle to constitute reproduce and vegetative reproduction is used.Because the trees take root, rooting for the callus-type,rooting rate lower,so far cutting smile is not universally applied in production;pressure of the breeding and grafting are the most widely applied methods of breeding,but its low propagation coefficient,which led to smile, excellent landscape tree species,in urban greening rarely applied.Therefore,research on smile cutting propagation technology is of great significance.A systematic research on smile softwood cutting propagation was done using four factors four level L16（44） orthogonal design, four factors were"cutting matrix,the type of root,rooting agent concentration,rooting processing time of the "The changes of physiological and biochemical substances were discussed.The results showed that:Ⅰ.Cutting matrix,rooting accelerator types,and the concentration of rooting for the promotion of processing time rooting had significant impact on rooting rate,the number of root,root length and other indicators,while there were significant differences among treatments.The best technology was the combination of following treatments:Kan-sun（200 mg / L） of the Sui soaking the base two hours,the use of sand for cutting matrix.Ⅱ.Soluble sugar and total nitrogen in cuttings had a very close relationship with rooting,hormone treatment could promote the conversion of total soluble sugar in cuttings and increased cuttings rooting rate.To enable the production of cuttings rooting to reach such a state in cutting proposals,the following measures should be taken:（1） the branches with appropriate nutritional status of trees for cuttings were selected,such as the lateral shoots.Because their rapid growth weakened, carbohydrates had begun to accumulate,while the top elected juicy shoot was not selected.（2） the shoots with more carbohydrates were selected for cuttings.Ⅲ.the change of phenolic substances in cutting process indicated that phenol was the rooting material,primordia adventitious root formation need a certain degree of phenolic substances,but a high phenolic substances did not help with content of callus formation.In a word,phenolic substances was inhibitory substances in the course of cutting,while low concentration of phenols was needed to smile rooting.
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