Studies on Early Events in Thin Cell Layer Culture of Nicotiana tabacum Mechanismfor differentiation and dedifferentiation of xylem cells Effects of Different Pretreatment on Three Endogenous Hormones Contents and Peroxidase ctivity in Barley Anther Effects of Di-butyl Phthalate on morphogenesis of Arabidopsis thaliana in vitro Ultracytochemical Localization of Acid Phosphatase During Differentiation and Dedifferentiation of the Secondary Xylem in Eucommia ulmoides Trunk Changes of Ribonuclease in Cotyledon Segment of Phaseolus radiatus L During Dedifferentiation Ultrastructural Study of Mesophyll Cells During Their Dediff erentiation in Stevia rebaudiana Ultrastructural Study on Cell Dedifferentiation in Safflower Tissue Culture In vitro Propagation, Dedifferentiation and redifferentiation of Marchantia polymorpha L. CYTOLOGICAL OBSERVATION ON DEDIFFERENTIATION INITIATION OF LEAF EXPLANTS IN BEGONIA COCClNEA STUDIES ON EARLYEVENTS IN COTYLEDON CELLSCULTURED IN VITRO OF ACACIA MANGIUM Cytological Observation of Bud Formation on the Leaf Surface of Test Tube Seedlings of Ramie Cell Fate Switch during In Vitro Plant Organogenesis Thidiazuron induced physiological and biochemical changes in the process of dedifferentiation of Fritillaria ussuriensis CHLOROPLAST ULTRASTRUCTURE AND DEDIFFERENTIATION IN TISSUE CULTURES OF STAEVIA REBAUDIANA BERTONI SMB Gene Involved in Cell Dedifferentiation of Arabidopsis thaliana Expression of Auxin-Related Genes during Dedifferentiation of Mature Embryo in Wheat