Studies on the Histology and Ultrastructure of the Initiation of Rhizoids and Protocorm-like Bodies(PLBs)Induced from the Leaf Explants of Rosa canina Study on the Characteristics of Protonema Development in Dolichomitriopsis diversiformis Phototropism of Thalli and Rhizoids Developed from the Thallus Segments of Bryopsis hypnoides Lamouroux Isolation and Expression Analysis of Cytokinin Dehydrogenase Gene RcCKX5 in Rosa canina Studies on the Histology and Ultrastructure of the Initiation of Rhizoids and Protocorm-like Bodies(PLBs)Induced from the Leaf Explants of Rosa canina Isolation of Fucoxanthin from the Rhizoid of Laminaria japonica Aresch EFFECT OF LIGHT ON GRAVITROPIC RESPONSE OF RHIZOIDS OF GAMETOPHYTES OF FERNS