Effect of moisture content on vigor of Cyathula officinalis seeds and its anti-aging mechanism analysis Desiccation Somatic Embryos of Transgenic Alfalfa A Study on Micropropagation and Germplasm Preservation in Tube of Rhododendron chrysanthum Pall. A Study on Micropropagation and Germplasm Preservation in Tube of Rhododendron chrysanthum Pall. Rapid Propagation System and Germplasm Preservation in vitro of Phyllodoce caerulea CRYOPRESERVATION OF PLANT TISSUE CULTURES