Low temperature conservation of Dioscorea bulbifera microtuber and genetic stability of its germination seedling Preliminary Study on In vitro Conservation of Dioscorea bulbifera L. Virus-free Plantlet Germplasm and its Genetic Stability and Virus Change Establishment of Regeneration System of Leaves and Stems of Dioscorea bulbifera L. Virus-free Plantlets Effects of plant growth regulators on induction formation for plantlet microtuber of Dioscorea bulbifera Study on cryopreservation and genetic stability of embryogenic calli induced from Dioscorea bulbifera microtuber Genetic Diversity of Dioscorea bulbifera L. Primary study on proliferation and rooting of stem with a bud in Dioscorea bulbifera qRT-PCR analysis of SQS gene expression during microtuber formation of Dioscorea bulbifera