THE EFFECTS OF SEVERAL EXOGENOUS HORMONES ON GERMINATION OF CHINESE FIR SEED The Effects of Several Exogenous Hormones on Bark Regeneration After Girdling in Eucommia ulmoides Effects of Glutamine,Proline,and Exogenous Hormones on the Anther Culture of Alfalfa Studies on anthraquinone biosynthesis in Morinda citrifolia suspension cells Effect of Exogenous Hormones on the Content of Active Oxygen and Activity of Antioxidant Enzymes of Watermelon Seedling under Low Temperature Stress