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First published online October 1, 2004; 10.1104/pp.104.050583

Plant Physiology 136:3095-3103 (2004)
© 2004 American Society of Plant Biologists

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CELL BIOLOGY AND SIGNAL TRANSDUCTION

The gravitropism defective 2 Mutants of Arabidopsis Are Deficient in a Protein Implicated in Endocytosis in Caenorhabditis elegans1,[w]

Rebecca A. Silady2, Takehide Kato2, Wolfgang Lukowitz3, Patrick Sieber4, Masao Tasaka and Chris R. Somerville*

Carnegie Institution, Department of Plant Biology, Stanford, California 94305 (R.A.S., W.L., P.S., C.R.S); Department of Biological Sciences, Stanford University, Stanford, California 94305 (R.A.S., C.R.S.); and Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara 630–0101, Japan (T.K., M.T.)

The gravitropism defective 2 (grv2) mutants of Arabidopsis show reduced shoot phototropism and gravitropism. Amyloplasts in the shoot endodermal cells of grv2 do not sediment to the same degree as in wild type. The GRV2 gene encodes a 277-kD polypeptide that is 42% similar to the Caenorhabditis elegans RME-8 protein, which is required for endocytosis. We hypothesize that a defect in endocytosis may affect both the initial gravity sensing via amyloplasts sedimentation and the subsequent more general tropic growth response.

1 This work was supported in part by grants from the U.S. Department of Energy (grant no. DOE–FG02–00ER20133), the U.S. Department of Agriculture Cooperative State Research, Education, and Extension Service (grant no. CSREES 00–35304–9394), the National Institutes of Health Cellular and Molecular Biology Training Program (grant no. 2–T32–GM007276 to R.A.S.), and the Human Frontiers Science Project organization (grant no. LT–594–96 to W.L.).

2 These authors contributed equally to the paper.

3 Present address: Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724.

4 Present address: Division of Biology 159–29, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125.

[w] The online version of this article contains Web-only data.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.050583.

* Corresponding author; e-mail crs{at}stanford.edu; fax 650–325–6857.

Received May 26, 2004; returned for revision July 27, 2004; accepted July 27, 2004.


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