Antioxidant Activity in Vitro of Glycoprotein from Chinese Yam Antioxidant Activity in Vitro of Glycoprotein from Chinese Yam Factors Influencing the Production of Chinese Yam (Dioscorea batatas Decne. ) Effects of Exogenous Gibberellin and Paclobutrazol on Tuber Expansion and Bulbil formation of Chinese Yam Effects of Exogenous Gibberellin and Paclobutrazol on Tuber Expansion and Bulbil formation of Chinese Yam