Development analysis of Dioscoreae Rhizoma in perspective of invention patent n vitro Propagation of Common Yam (Dioscorea opposita) The callus induction and high-frequency regeneration of Dioscorea opposita Thunb Determination of allantoin in dried rhizoma of Dioscorea opposita by capillary electrophoresis Research on Tissue Culture for Rapid Propagation and in vitro Bulbils Regeneration System of Dioscorea opposita Thunb Impact factors in in vitro induction of microtubers from Dioscorea opposita Cryopreservation Technique of Dioscorea opposita Thunb. Germplasm Resources by Vitrification Genetic Diversity Analysis and Primary Core Collection Construction in Yam (Dioscorea opposita Thunb.) by ISSR Marker Cryopreservation technique of Dioscorea opposita germplasm by vitrification