铁皮石斛原球茎高效再生体系的研究

目的以铁皮石斛Dendrobium officinale实生种子为外植体,研究铁皮石斛原球茎的增殖、分化、诱导生根等条件,筛选出适宜铁皮石斛原球茎高效再生的诱导条件,建立高效的再生体系。方法以铁皮石斛种子为外植体,在培养基上诱导产生原球茎,经过增殖培养后,转移到分化培养基中诱导芽苗分化,待分化的芽苗长到1~2 cm时,转移到生根培养基诱导生根,最终长成完整的再生植株。结果适宜铁皮石斛生长的基本培养基为1/2 MS;原球茎诱导的培养基为1/2 MS+1.0 mg/L6-BA+0.2 mg/L NAA+50 g/L土豆泥;原球茎增殖的最适培养基为1/2 MS+1.0 mg/L 6-BA+0.5 mg/L NAA,最高增殖系数达23;最佳分化培养基为1/2 MS+2.0 mg/L 6-BA+0.2 mg/L NAA,平均分化率最高达95%;最佳生根培养基为1/2 MS+0.3mg/L NAA+50 g/L土豆泥,生根率达100%。结论铁皮石斛实生种子是铁皮石斛离体繁殖的优良外植体来源。以铁皮石斛种子诱导获得的高效再生技术体系可以为铁皮石斛快速繁殖和工厂化生产提供理论基础。

Protocorm proliferation and regeneration of Dendrobium officinale

Objective To establish an efficient tissue culture and rapid propagation system, and study the protocorm proliferation and regeneration conditions using seeds as explants in Dendrobium officinale. Methods Seeds of D. officinale were used as explants, protocorm was induced on inducement medium. After proliferation, the protocorm were transferred to the regeneration medium. Then the regenerated shoots were transferred into rooting medium to induce rooting of plantlets, and developing complete plant. Results The basic culture medium for D. officinale growth was 1/2 MS; The best culture medium formula for inducing protocorms was 1/2 MS +1.0 mg/L 6-BA + 0.2 mg/L NAA + 50 g/L mashed potato; The optimal proliferation medium for protocorm was 1/2 MS + 1.0 mg/L 6-BA + 0.5 mg/L NAA, and the maximum multiplication factor could reach 23. The optimal regeneration medium was 1/2 MS + 2.0 mg/L 6-BA + 0.2 mg/L NAA, regeneration rate can reach 95%; The best culture medium for seedling rooting was 1/2 MS + 0.3 mg/L NAA + 50 g/L potato juice, and rooting rate reached 100%. Conclusion This research provides an effective way for keeping good varieties of features and rapid propagation of D. officinale, at the same time helps to solve some theoretical problems in factory production of D. officinale.