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Plasmodesmata

Plasmodesmata

The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.

Contact-dependent Signaling

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...

Cell Signaling in Plants

Cell Signaling in Plants

Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...

The Apoplast and Symplast

The Apoplast and Symplast

Plant growth depends on its ability to take up water and dissolved minerals from the soil. The root system of every plant is equipped with the necessary tissues to facilitate the entry of water and solutes. The plant tissues involved in the transport of water and minerals have two major compartments - the apoplast and the symplast. The apoplast includes everything outside the plasma membrane of living cells and consists of cell walls, extracellular spaces, xylem, phloem, and tracheids. The...

Cell Adhesion in Plants

Cell Adhesion in Plants

Plants have rigid cell walls that are made up of cell wall polysaccharides that mediate cell-cell adhesion. The primary cell walls of plants consist of two independent and interacting polysaccharide networks: a pectin matrix that embeds the second network comprising cellulose and hemicelluloses.
Pectins are complex heteropolymers mainly composed of negatively-charged α-D-glucopyranosyl uronic acid and some neutral glycosyl residues such as α-L-rhamnopyranose, α-L-arabinofuranose,...

Short-distance Transport of Resources

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.

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Related Experiment Video

Updated: Jul 1, 2025

Author Spotlight: Microscopic Analysis of Protein Localization at Plasmodesmata in Plants

Author Spotlight: Microscopic Analysis of Protein Localization at Plasmodesmata in Plants

Published on: November 1, 2024

Distributing Plant Developmental Regulatory Proteins via Plasmodesmata.

Joyce M Schreiber¹, Erik Limpens², Jeroen de Keijzer¹

¹Laboratory of Cell and Developmental Biology, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.

Plants (Basel, Switzerland)

|March 13, 2024

Summary

Mobile proteins like transcription factors move between plant cells through plasmodesmata to regulate development. This intercellular transport is controlled by both plasmodesmata structure and cargo protein mechanisms.

Keywords:

KNOTTED1 SHORTROOT intercellular communication non-cell-autonomous transcription factors plant meristem plasmodesmata

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Last Updated: Jul 1, 2025

Author Spotlight: Microscopic Analysis of Protein Localization at Plasmodesmata in Plants

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Identification of Plasmodesmal Localization Sequences in Proteins In Planta

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Area of Science:

Plant Biology
Cell Biology
Developmental Biology

Background:

Mobile proteins, including transcription factors, act as intercellular messengers in plants.
These proteins move between cells via plasmodesmata, which are nanopores in the cell wall.
Intercellular transport is crucial for activating signaling cascades in plant development.

Purpose of the Study:

To review the dynamics of plasmodesmata formation and structure during plant development.
To explore mechanisms controlling protein transport through plasmodesmata.
To understand how intercellular protein movement regulates plant development.

Main Methods:

Review of existing literature on plasmodesmata dynamics and protein transport.
Analysis of regulatory mechanisms at plasmodesmata and cargo protein levels.
Synthesis of current insights into intercellular communication in plants.

Main Results:

Plasmodesmata density and structure are dynamically regulated during development.
Cargo-specific mechanisms, not a single model, control protein transport.
Intercellular protein movement is a key factor in developmental control.

Conclusions:

Plant development relies on sophisticated, multi-faceted control of intercellular protein transport.
Regulation occurs at both the plasmodesmata channels and the transported proteins.
A diverse set of mechanisms ensures precise developmental signaling via protein trafficking.