Plant Physiology Preview
Published on October 1, 2004; 10.1104/pp.104.050583
Received May 26, 2004
Returned for revision July 27, 2004
Accepted July 27, 2004
The gravitropism defective 2 Mutants of Arabidopsis Are Deficient in a Protein Implicated in Endocytosis in Caenorhabditis elegans
Rebecca A. Silady , Takehide Kato , Wolfgang Lukowitz , Patrick Sieber , Masao Tasaka , and Chris R. Somerville *
Carnegie Institution, Department of Plant Biology, Stanford, California 94305; Department of Biological Sciences, Stanford University, Stanford, California 94305
Graduate School of Biological Sciences, Nara Institute of Science and Technology, Nara 630-0101, Japan
Carnegie Institution, Department of Plant Biology, Stanford, California 94305
* Corresponding author; email: crs{at}stanford.edu.
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.
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