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Curr Opin Plant Biol. 2005 Dec;8(6):619-24. Epub 2005 Sep 21.

Directional cell expansion--turning toward actin.

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

Abstract

Significant recent progress toward understanding directional expansion in diffusely growing plant cells concerns actin. Tools for imaging actin, including both live-cell reporters and fixation protocols, have been improved. Proteins that interact with actin have been identified and their functions probed biochemically and genetically. Specifically, members of the actin-related protein2/3 (ARP2/3) complex and the Wiskott-Aldrich syndrome Verprolin-homologous (WAVE) complex have been identified. These proteins have salient functions in shaping trichomes and leaf pavement cells. Additionally, two targets of a rho-of-plants (ROP) G-protein have been discovered that exert opposing regulatory action on actin and microtubules, a pathway that appears to be responsible for establishing the undulating shapes of pavement cells. Finally, several mutants of the fragile fiber class have revealed a link between actin organization, cell wall synthesis, and phosphoinositol signaling.

PMID:
16181803
[PubMed - indexed for MEDLINE]
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