The gravitropism defective 2 mutants of Arabidopsis are deficient in a protein implicated in endocytosis in Caenorhabditis elegans.
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.
Silady
Rebecca A
RA
Carnegie Institution, Department of Plant Biology, Stanford, California 94305, USA.
Kato
Takehide
T
Lukowitz
Wolfgang
W
Sieber
Patrick
P
Tasaka
Masao
M
Somerville
Chris R
CR
D000818:Animals; D017360:Arabidopsis / Q000235:genetics* / Q000502:physiology; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000502:physiology; D017173:Caenorhabditis elegans / Q000502:physiology*; D029742:Caenorhabditis elegans Proteins / Q000502:physiology*; D004705:Endocytosis / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D018522:Gravitropism / Q000235:genetics* / Q000502:physiology; D008027:Light; D009154:Mutation; D018524:Phototropism / Q000502:physiology; D018520:Plant Shoots / Q000502:physiology; D013997:Time Factors
D029681:Arabidopsis Proteins; D029742:Caenorhabditis elegans Proteins