Effects of Cytokinins on Shoot Organogenesis from Cotyledon of Pepper Study on Organogenesis of Liriodendron chinense×L.tulipifera High Efficient Organogenic Regeneration from Hypocotyl Explants of Soybean (Glycine max L.) on BA-free Medium Morphology and anatomy of organogenesis from tissue culture plantlets of Camellia oleifera Morphological and Anatomical Studies of Floral Organogenesis and Development in Catalpa speciosa