Study On The Cutting Propagation Technique And Physiological Basis Of Rooting Of Sabina Davurica (Pall.) Ant.

Sabina davurica (Pall.) Ant. was evergreen shrub species of Cupressaceae trees. They were recognized for their advantages of tolerance to wind and sand, drought and barren, etc. It can play a great role at the vegetation recovery in the desertfied areas. This paper carried out a research on the propagation techniques. That the external indolebutyric acid(IBA)and nathphylacetic acid(NAA)treat the bottom of soft wood,hard wood and can affected the variation of Carbohydrates, protein, protective Enzyme system, PPO activity. All of them try to provide the theoretical and realistic basement physiological mechanisms meaning.(1) The hard wood cutting was one rapid propagation techniques suit to Sabina davurica (Pall.) Ant. The root characters of the hard wood cutting was the best with the Fluviatile soil. Tbe longest root can reach 14.3cm and they have more little roots; The cuttings were made of the upper of the two years old hardwood branches in the end of June and the begin of July, and that survival rate was higher; Treated by NAA 500mg/L or IBA 500mg/L the survival rate was the highest. It was higher than 80%. Soft wood cutting for Sabina davurica (pall.) Ant.was more difficult, and the survival rate was lower than 10% treated by water. Using the suit technology increased the survival rate. It was significant differences in survival rate cutting treated by different hormone and concentration, the best survival rate was 50% when 200mg/L NAA was used to treat cutting.(2)The dynamic balances of endogenous hormone regulate adventitious rooting of the green wood cutting, the external indolebutyric acid(IBA)and nathphylacetic acid(NAA)treat could increase the contents of IAA, IAA/ABA and IAA/ZT and it decrease the contents of ZT and IAAO activity in soft wood cuttings during the rooting. The treat also increase the contents of IAA, IAA/ABA and IAA/ZT. It decrease the contents of GA and IAAO activity in hardwood cuttings during the period of root initiation. All the changes were good for rooting and they can increase the survival rate. But all treatments could not decrease the contents of ABA. The fluctuations of the IAA,IAA/ABA and IAA/ZT in the bottom of the hardwood cuttings were more similar.(3) There were so much difference during its rooting in SOD,POD and PPO. That the external IBA and NAA treated the cuttings can incarese the activity of SOD which delayed cuttage senescence whichwerebenefittorooting. Theactivitiesofperoxidase (POD) andpolyphenol oxidase (PPO) changed regularly. The differences of enzyme activities indifferent stages of rooting were very significant. It was indicate that the origin and development of adventitious roots in Sabina dawrica (Pall.) Ant. relative to POD, PPO, and IAAO. The differences of the promoting efficiency of IAA and IBA to different clones and differentoxidase activities ere significant or very significant.(4)The softwood cuttings were treated with indolebutyric acid(IBA)and nathphylacetic acid(NAA), the contents of soluble sugar,water and soluble protein is higher than water treatment during rooting. But the hormone treatment decreased the soluble amylum of the cuttings. It was showed that the translation of nutritive materials in cuttings could be promoted by the hormone treatment, moreover the rooting rate increased. Several cutting methods were studied, the technology of hard wood cutting for Sabina davurica (Pall.) Ant.were obtained, and the physiological mechanisms of rooting were researched further. These had great theoretical and realistic meanlng.But the proportion of hormone and the physiological mechanisms of rooting, forming sprout at soft wood cutting should be researched in-depth, in order to establish the mature clonal propagation technologic system and theory and promote the rapid propagation of Sabina davurica (Pall.) Ant..