| Catalpa bungei, belongs to the family of the Bignoniaceae and the genus of Catalpa is deciduous arbors and has been cultivated for more than 2,000 years in China,is a high-quality timber species and well known for his excellent material, so it is called the "wood kindom". Catalpa bungei has straight trunks and beautiful crown, the height is above 30 m and the diameter is up to 1 m. Catalpa bungei are with good traits of lasher branches and leaves, flourishing, vivid, shapely, flowering from April to May, the bell-shaped flowers, white garland, red decorations. Ripe fruit from September to October, the capsule is slender, dangling like screens, giving graceful and uplifting feeling.Catalpa bungei with high adaptiveness , located in east China's waterfront, west to Gansu, South to Yunnan, north to the Great Wall. Catalpa tree is a unique species with the advantages of ornamental Plant, environmental protection, prevention, corrosion resistance.However, Catalpa bungei is self-sterile, little bears fruits, difficult to breed, low seed germination rate, difficult rooting, seriously hampering the development of Catalpa tree, causing the species dwindling resources, some places have become extinct or endangered.The topic is based on the predecessors with the Shaanxi Province Forestry Office issued, Shaanxi Province Forestry Research Center's "Catalpa Tree Breeding Research" project, studied on the rapid propagation techniques of cloning technology research. Grafting Experiment in the Weihe River Station shows : "Tsang Catalpa 1" audited by Henan Provincial Forestry Institute in 2002 is suitable to cultivate in the Guanzhong area of Shaanxi Province.Grafting : Catalpa tree grafted to wedge block budding shoots best, Grafting time in the spring before the sap flows (Shaanxi Province in mid-March) as well. The diameter of rootstock is 1-2cm, rowing space is 20 cm×30 cm, the average height of one year-old seedling was 1.25 m,the average basal diameter was 0.86 cm, the survial rate was above 85%. Cuttings : the average survival rate of softwood cutting using NAA is 36.67%. ABT100 has greatest impact on the survival rate of softwood cutting, it makes survival rate increased to 55%; the survival rate of hardwood cuttings is up to 71% using 100 mg L-1 NAA.Tissue culture : the suitable medium for adventitious shoot is MS +6-BA 0.8 mg·L-1+IBA0.1 mg·L-1, the best propagation medium is N6+6-BA1.5 mg·L-1 +NAA0.0016 mg·L-1 and the growing roots medium is 1/2MS+IBA0.5 mg·L-1 is better than the medium 1/2MS+NAA0.8mg·L-1.In short, it is indicated that : the best way of rapid propagation for catalpa bungei is budding, Because the budding technology is simple, low cost, high survival rate and easy to grasp.
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