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Directional cell expansion--turning toward actin.

Alex Bannigan¹, Tobias I Baskin

¹Biology Department, University of Massachusetts, Amherst, Massachusetts 01003, USA.

Current Opinion in Plant Biology

|September 27, 2005

Summary

Recent advances reveal how actin dynamics guide plant cell growth. Key protein complexes like ARP2/3 and WAVE, along with ROP G-protein pathways, control cell shape and organization.

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Area of Science:

Plant cell biology
Cytoskeletal dynamics
Molecular plant science

Background:

Understanding directional cell expansion in plants is crucial for development.
The role of the actin cytoskeleton in plant cell growth is an active area of research.
Recent technological advancements facilitate the study of actin dynamics.

Purpose of the Study:

To review recent progress in understanding the role of actin in plant cell expansion.
To highlight key protein complexes and pathways involved in regulating cell shape.
To connect actin organization with cell wall synthesis and signaling.

Main Methods:

Live-cell imaging and advanced fixation techniques for actin visualization.
Biochemical and genetic analyses of actin-interacting proteins.
Investigation of rho-of-plants (ROP) G-protein signaling pathways.
Analysis of fragile fiber mutants to link actin, cell wall synthesis, and phosphoinositol signaling.

Main Results:

The actin-related protein2/3 (ARP2/3) and Wiskott-Aldrich syndrome Verprolin-homologous (WAVE) complexes are essential for shaping trichomes and pavement cells.
ROP G-protein targets regulate both actin and microtubules, establishing pavement cell undulation.
Fragile fiber mutants demonstrate a connection between actin organization, cell wall synthesis, and phosphoinositol signaling.

Conclusions:

Actin dynamics, regulated by specific protein complexes and signaling pathways, are fundamental to directional plant cell expansion and morphogenesis.
Further research into these mechanisms will provide deeper insights into plant development and cellular architecture.
The interplay between the cytoskeleton, cell wall, and signaling pathways is critical for plant cell shape determination.

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