Plasmodesmata originate during cell division. Several aspects of the process are shown. First, mitosis in two cells side by side. Two stages of the process are depicted, metaphase and telophase. Nicotiana tabacum mesophyll.
Arrowheads delimit the cell plates.
Microtubules involved in the direction of movement of dictyosome vesicles toward the cell plate are assembled into a phragmoplast. This growth follows the centrifugal spread of the phragmoplast. The vesicles are delimited by a membrane that becomes the plasmalemma after the vesicles fuse. Parenchyma from petiole of Echium judaeum . Longitudinal and partial surface views of growing cell plates showing involvement of ER on formation of plasmodesmata.