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Plant Physiol. 2004 Oct;136(2):3095-103; discussion 3002. Epub 2004 Oct 1.

The gravitropism defective 2 mutants of Arabidopsis are deficient in a protein implicated in endocytosis in Caenorhabditis elegans.

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  • 1Carnegie Institution, Department of Plant Biology, Stanford, California 94305, USA.

Abstract

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.

PMID:
15466218
PMCID:
PMC523370
DOI:
10.1104/pp.104.050583
[PubMed - indexed for MEDLINE]
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