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

• Published in: Plant physiology (Bethesda) Vol. 136; no. 2; pp. 3095 - 3103
• Main Authors: Silady, R.A, Kato, T, Lukowitz, W, Sieber, P, Tasaka, M, Somerville, C.R
• Format: Journal Article
• Language: English
• Published: Rockville, MD American Society of Plant Biologists 01.10.2004; American Society of Plant Physiologists
• Subjects: Alleles; Amyloplasts; Animals; Arabidopsis - genetics; Arabidopsis - physiology; Arabidopsis Proteins - genetics; Arabidopsis Proteins - physiology; Arabidopsis thaliana; Auxins; Biological and medical sciences; Caenorhabditis elegans; Caenorhabditis elegans - physiology; Caenorhabditis elegans Proteins - physiology; Cell Biology and Signal Transduction; Cell walls; chromosome mapping; complementary DNA; Endocytosis; Endocytosis - physiology; Fundamental and applied biological sciences. Psychology; gene expression; Gene Expression Regulation, Developmental; Gene Expression Regulation, Plant; Genetic mutation; Gravitropism; Gravitropism - genetics; Gravitropism - physiology; gravitropism defective 2 mutant; GRV2 gene; Hypocotyls; Inflorescences; Light; molecular sequence data; mutants; Mutation; nucleotide sequences; phototropism; Phototropism - physiology; Physical agents; Plant physiology and development; plant proteins; Plant Shoots - physiology; Plants; Time Factors; Vegetative apparatus, growth and morphogenesis. Senescence; Phototropism; Amyloplast; Homology; Protein; Arabidopsis thaliana; Endocytosis; Gene; Cruciferae; Dicotyledones; Angiospermae; Gravitropism; Above ground plant part; Spermatophyta; Mutation
• ISSN: 0032-0889; 1532-2548
• DOI: 10.1104/pp.104.050583

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.