Which structure allows for cell-to-cell communication and is found only in plant cells?

Plasmodesmata are specialized structures that facilitate communication and transport between plant cells. They are microscopic channels that traverse the cell walls, allowing the direct transfer of molecules and ions, including nutrients and signaling molecules, from one cell to another. This is crucial for coordinating activities and responses within plant tissues since plant cells are often encased within rigid cell walls that prevent conventional forms of cell-to-cell communication found in animal cells.

These channels connect the cytoplasm of adjacent cells, enabling not only the sharing of essential metabolites but also the transmission of signals that can regulate growth and development. This unique feature contributes significantly to the overall functioning and integration of plant systems.

Other structures, such as chloroplasts, centrioles, and the rough endoplasmic reticulum, do not possess similar functions related to direct cell-to-cell communication in plants, making plasmodesmata the distinct choice in this context.