[Effects of different light and GA3 on the germination and seedling growth of Rhodiola sachalinensis].

Objective: To improve germination rate and research the seed germination character of Rhodiola sachalinensis.

Methods: Made seed germinated under water or with moisture, at light or dark condition, effects of 6 different light qualities (black, white, blue, green, red and far red light) illumination on seed germination were studied. The seedling growth at different temperature were studied as well.

Results: The results indicated that light was required for Rhodiola sachalinensis seeds germinate, 83.3% germination rate at light and soaking in watercondition; Seed germination were improved to 84%, 70.7% and 52.0% respectively in white, red and green light quality illumination, the germination rate reached 84% after 9 h of white light illumination. Germination rate were 80% after 100 mg/L GA3 treatment for 3 h under dark condition. 20 degrees C was the optimal temperature for Rhodiola sachalinensis seedling growth, under with the plant height, fresh weight and dry weight of plant were the best. Seedling growth rate and the dry weight increased obviously at 35 d and 50 d.

Conclusion: The experiment definited the best condition for Rhodiola sachalinensis seed germination and seedling growth, supplied basic data for large scale planting Rhodiola sachalinensis using seed propagation technology.