Abstract: Cell ultrastructures in rape(Brassica napus L.)leaves and their calli,andmeristemoids were studied by transmission electron microscopy in detial.Our resultsshowed that their ultrastructures had many profound changes,the main differences ofthese changes were that the rape mesophyll cell was a kind of

Key words: Rape mesophyll cell, Callus cell, Meristematic cell, De-differentiation Re-differentiation, Ultrastructural change