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Related Experiment Video

Updated: Jan 12, 2026

Author Spotlight: Image-Based Methods to Study Membrane Trafficking Events in Stomatal Lineage Cells

Author Spotlight: Image-Based Methods to Study Membrane Trafficking Events in Stomatal Lineage Cells

Published on: May 12, 2023

Novel insights into RabA2b intracellular localization suggest a role in plasmodesmatal function.

Vivek Ambastha¹, Dafna Tidhar^1,2, Ifat Matityahu¹

¹Department of Plant Sciences, MIGAL - Galilee Research Institute, Kiryat-Shmona, Israel.

Frontiers in Plant Science

|November 3, 2025

Summary

RabA2b, a Rab GTPase, is newly found to associate with plant cell connections called plasmodesmata (PD). Overexpression enhances symplastic transport, suggesting RabA2b

Keywords:

Hechtian strands Rab small GTPases RabA2b microchannel transport plasma membrane trafficking plasmodesmata water stress

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Last Updated: Jan 12, 2026

Author Spotlight: Image-Based Methods to Study Membrane Trafficking Events in Stomatal Lineage Cells

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Published on: May 12, 2023

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

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Published on: November 1, 2024

Identification of Plasmodesmal Localization Sequences in Proteins In Planta

Identification of Plasmodesmal Localization Sequences in Proteins In Planta

Published on: August 15, 2017

Area of Science:

Plant Cell Biology
Molecular Plant Physiology
Cell-to-Cell Communication

Background:

Plasmodesmata (PD) are essential intercellular channels connecting plant cells, forming the symplast for molecule transport.
Rab small GTPases regulate vesicle trafficking, but their specific role in PD targeting and transport remains largely unknown.

Purpose of the Study:

To investigate the role of Rab GTPases in plasmodesmata targeting and intercellular trafficking.
To identify specific Rab members involved in regulating symplastic transport and PD function.

Main Methods:

Localization studies of RabA2b in Arabidopsis thaliana.
Analysis of symplastic transport in plants with altered RabA2b expression.
Observation of RabA2b localization under osmotic stress conditions.

Main Results:

RabA2b was identified and localized to plasmodesmata in Arabidopsis.
Overexpression of RabA2b enhanced symplast-mediated transport.
RabA2b localized to Hechtian Strands and their docking sites during osmotic stress.

Conclusions:

RabA2b is a novel regulator associated with plasmodesmata.
RabA2b plays a role in regulating PD permeability and symplast integrity.
These findings are crucial for understanding water maintenance during plant water stress.