Phragmosome

A structure involved in plant cell division

Phragmosome

The phragmosome is a cytoplasmic structure that forms in plant cells prior to cell division, particularly during the process of cytokinesis. It is a crucial component in the division of plant cells, ensuring that the division plane is correctly established and that the resulting daughter cells are properly partitioned.

Diagram of a phragmosome in a plant cell

Formation

The phragmosome forms during the interphase of the cell cycle, specifically in large vacuolated plant cells. It is composed of cytoplasmic strands that traverse the vacuole, connecting the nucleus to the cell cortex. These strands are thought to be involved in positioning the nucleus in the center of the cell, which is essential for the correct orientation of the division plane.

Function

The primary function of the phragmosome is to establish the division plane in plant cells. It acts as a scaffold that guides the formation of the phragmoplast, a structure that facilitates the construction of the new cell wall between the daughter cells. The phragmosome ensures that the phragmoplast forms in the correct location, allowing for symmetrical cell division.

Role in Cytokinesis

During cytokinesis, the phragmosome helps to organize the microtubules and actin filaments that are necessary for the formation of the phragmoplast. The phragmoplast is responsible for guiding the vesicles that deliver cell wall materials to the division site, ultimately leading to the formation of the new cell wall.

Significance

The phragmosome is significant because it ensures that plant cells divide correctly, maintaining the structural integrity and function of plant tissues. Proper cell division is essential for plant growth, development, and reproduction.

Related pages

• Cytokinesis
• Phragmoplast
• Cell division
• Plant cell