Hypoxia Can Damage Nucleolar Structure and Inhibit Its Function on Root-tip Meristematic Cells of Common Wheat Electron microscopic observation of nucleolar channels in root-tip meristematic cell nuclei of common wheat THE ULTRASTRUCTURAL CHANGES INDUCED BY COLCHICINE IN MERISTEMATIC CELLS OF WHEAT ROOT Changes of Ca2+ distribution in root apical meristematic cells of wheat under aluminum stress Effects of the intercellular rhizobla on meristematic nuclei in wheat nodule-like Ultrastructural Changes in Rape Mesophyll Cells during Their De-differentiation and Re-differentiation Cytological Observation of Bud Formation on the Leaf Surface of Test Tube Seedlings of Ramie EFFECT OF DIMETHYL SULFOXIDE ON ULTRASTRUCTUES OF ROOT MERISTEMATIC CELLS OF SECALE CEREALE F-actin is a Nuclear and Chromosomal Component of the Meristematic Cells of Allium sativum