title: The Arabidopsis WAVY GROWTH 2 protein modulates root bending in response to environmental stimuli.
abstract: To understand how the direction of root growth changes in response to obstacles, light, and gravity, we characterized an Arabidopsis thaliana mutant, wavy growth 2 (wav2), whose roots show a short-pitch pattern of wavy growth on inclined agar medium. The roots of the wav2 mutant bent with larger curvature than those of the wild-type seedlings in wavy growth and in gravitropic and phototropic responses. The cell file rotations of the root epidermis of wav2-1 in the wavy growth pattern were enhanced in both right-handed and left-handed rotations. WAV2 encodes a protein belonging to the BUD EMERGENCE 46 family with a transmembrane domain at the N terminus and an alpha/beta-hydrolase domain at the C terminus. Expression analyses showed that mRNA of WAV2 was expressed strongly in adult plant roots and seedlings, especially in the root tip, the cell elongation zone, and the stele. Our results suggest that WAV2 is not involved in sensing environmental stimuli but that it negatively regulates stimulus-induced root bending through inhibition of root tip rotation.
authors.affiliation: RIKEN Plant Science Center, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Mochizuki
authors.forename: Akiko
authors.initials: A
authors.lastname: Harada
authors.forename: Sayaka
authors.initials: S
authors.lastname: Inada
authors.forename: Keiko
authors.initials: K
authors.lastname: Sugimoto-Shirasu
authors.forename: Nicola
authors.initials: N
authors.lastname: Stacey
authors.forename: Takuji
authors.initials: T
authors.lastname: Wada
authors.forename: Sumie
authors.initials: S
authors.lastname: Ishiguro
authors.forename: Kiyotaka
authors.initials: K
authors.lastname: Okada
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Sakai
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D018522:Gravitropism; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics* / Q000378:metabolism; D026901:Membrane Transport Proteins / Q000235:genetics* / Q000378:metabolism; D018613:Microscopy, Confocal; D008870:Microtubules / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D018524:Phototropism; D018517:Plant Roots / Q000254:growth & development* / Q000378:metabolism / Q000648:ultrastructure; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D011993:Recombinant Fusion Proteins; C505422:WAV2 protein, Arabidopsis; D049452:Green Fluorescent Proteins