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Updated: Jul 31, 2026

Cell Specific Analysis of Arabidopsis Leaves Using Fluorescence Activated Cell Sorting
Published on: October 4, 2012
The Arabidopsis GNARLED gene encodes the NAP125 homolog and controls several actin-based cell shape changes
I Zimmermann1, R Saedler, M Mutondo
1Botanical Institute, University of Köln, Gyrhofstrasse 15, 50931 Köln, Germany.
Abstract:
In plants many aspects of cell shape regulation are controlled by actin-dependent processes. The ARP2/3 complex has been recognized as a regulator of actin organization. Mutations in genes encoding components of the ARP2/3 complex lead to cell shape defects in several cell types, including trichomes, epidermal pavement cells and hypocotyl cells. We show here that mutations in the GNARLED (GRL) gene cause a similar range of phenotypes. The GRL gene encodes the Arabidopsis homolog of NAP125, which in animals is known to act as one regulator of the ARP2/3-regulating complex WAVE-HSPC300. As an HSPC300 homolog is present in the Arabidopsis genome but no WAVE homolog has yet been found, the existence of a related regulation pathway was doubtful. Our finding that GRL encodes a putative regulator of the WAVE-HSPC300 complex, NAP125, combined with the phenotypic similarity between arp2/3 and grl mutants, provides evidence that the ARP2/3 complex is indeed regulated by the above mentioned pathway in Arabidopsis.
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