Regulation of auxin response by the protein kinase PINOID.
Arabidopsis plants carrying mutations in the PINOID (PID) gene have a pleiotropic shoot phenotype that mimics that of plants grown on auxin transport inhibitors or of plants mutant for the auxin efflux carrier PINFORMED (PIN), with defects in the formation of cotyledons, flowers, and floral organs. We have cloned PID and find that it is transiently expressed in the embryo and in initiating floral anlagen, demonstrating a specific role for PID in promoting primordium development. Constitutive expression of PID causes a phenotype in both shoots and roots that is similar to that of auxin-insensitive plants, implying that PID, which encodes a serine-threonine protein kinase, negatively regulates auxin signaling.
Christensen
S K
SK
The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Dagenais
N
N
Chory
J
J
Weigel
D
D
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics; D029681:Arabidopsis Proteins; D001483:Base Sequence; D015415:Biomarkers; D018744:DNA, Plant; D015870:Gene Expression; D007210:Indoleacetic Acids / Q000378:metabolism*; D018519:Meristem; D008969:Molecular Sequence Data; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*
D029681:Arabidopsis Proteins; D015415:Biomarkers; D018744:DNA, Plant; D007210:Indoleacetic Acids; C405165:PINOID protein, Arabidopsis; D017346:Protein Serine-Threonine Kinases