With the materia1 of embryo from field seeds of Thea sinensis L.var.Fud-ingdabai asexual reproduction lines,different explants of cotyledon,plumule,epicotyle,radicle were cultured in vitro to induce callus formation.The cutting pieces of the tighten callus were then co-cultured with Agrobacterium tumefaciens which carries NPT Ⅱ,GUS geiies on their Ti plasmid.After selecting with kanamycin,resistant callus were obtained and resistant buds induced.The inducing rate of resistant callus was about 5%,It was found that the callus fa-cilitated the ba...