Development of a plant regeneration system via tissue culture in Puccinellia tenuiflora Trasfering Soybean Gene into Hedysarum mongolicum Mature Seeds by Low Energy N+ Implantation High Frequency Induction of Somatic Embryoid of Rice in Suspension Culture A Study on the Technique of Plant Regeneration from Mature Seed Embryo of Kentucky bluegrass in vitro Tissue culture and plant regeneration from mature seed of two cultivars of tall fescue