Cutting Propagation Technique And Rooting Mechanism Of Sinojackia Xylocarpa

The cutting propagation technology, rooting mechanism and anatomy of 1a seedlings were observed and investigated when hardwood and softwood cutting were treated with exogenous auxin. The main conclusions were as follow:(1) The rooting characters of hardwood and softwood cuttings were influenced by exogenous auxin and concentration. The kind of exogenous auxin was the main factor influencing rooting. To liquid auxin,the rooting rate for hardwood cutting treated by NAA+IBA(1:1) with 1500mg·.L-1 for 5s reached to 88%. Another, average number of roots was 16 for each cutting, average length of roots was 4.6 cm. However, softwood cuttings were treated by NAA+IBA(1:1) with 1000mg·L-1 for 60s, cuttings had 97% rooting rate with 18 of 5.0cm long roots for each cutting.IBA powder was better than the others. 89% of all hardwood cuttings treated with 1500mg·kg-1 IBA powder, each could produce mean 37 adventitious roots about mean 4.4cm long. For softwood cuttings, 2000mg·kg-1 IBA powder was the best, and 97% of all cuttings, each could produce 37 adventitious roots about average 3.5cm long.(2) The amount of nutrients of S.xylocarpa were different between hardwood and softwood cuttings. However, they had the same tendency during rooting. Generally, the rooting of cutting consumes nutritive substance with the appearance of callus and adventitious root. The content of nutritive substance of cuttings treated with IBA or NAA+IBA(1:1) was higher than that of NAA and CK.(3)The exogenous IBA, NAA+IBA (1:1) and NAA could increase the activity of POD and PPO of cuttings(4) The exogenous IBA, NAA+IBA (1:1) and NAA could increase the contents of IAA,GA3 and IAA/ABA of cuttings and lead to ABA activity decrease during the rooting.(5) The adventitious roots belonged to induced root primordiums. By certain conditions, the incubate root primordiums of S.xylocarpa initialed from the vascular cambium cells,the interface of cortex and pith, the pholem cells and the callus. The incubate root primordiums occured earlier and more than that of CK.