Your browser doesn't support javascript.
loading
Root cap-dependent gravitropic U-turn of maize root requires light-induced auxin biosynthesis via the YUC pathway in the root apex.
Suzuki, Hiromi; Yokawa, Ken; Nakano, Sayuri; Yoshida, Yuriko; Fabrissin, Isabelle; Okamoto, Takashi; Baluska, Frantisek; Koshiba, Tomokazu.
Afiliación
  • Suzuki H; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Yokawa K; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan IZMB, University of Bonn, D-53115 Bonn, Germany.
  • Nakano S; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Yoshida Y; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Fabrissin I; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Okamoto T; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan.
  • Baluska F; IZMB, University of Bonn, D-53115 Bonn, Germany koshiba-tomokazu@tmu.ac.jp baluska@uni-bonn.de.
  • Koshiba T; Department of Biological Sciences, Tokyo Metropolitan University, Tokyo 192-0397, Japan koshiba-tomokazu@tmu.ac.jp baluska@uni-bonn.de.
J Exp Bot ; 67(15): 4581-91, 2016 08.
Article en En | MEDLINE | ID: mdl-27307546
Gravitropism refers to the growth or movement of plants that is influenced by gravity. Roots exhibit positive gravitropism, and the root cap is thought to be the gravity-sensing site. In some plants, the root cap requires light irradiation for positive gravitropic responses. However, the mechanisms regulating this phenomenon are unknown. We herein report that maize roots exposed to white light continuously for ≥1-2h show increased indole-3-acetic acid (IAA) levels in the root tips, especially in the transition zone (1-3mm from the tip). Treatment with IAA biosynthesis inhibitors yucasin and l-kynurenine prevented any increases in IAA content and root curvature under light conditions. Analyses of the incorporation of a stable isotope label from tryptophan into IAA revealed that some of the IAA in roots was synthesized in the root apex. Furthermore, Zmvt2 and Zmyuc gene transcripts were detected in the root apex. One of the Zmyuc genes (ZM2G141383) was up-regulated by light irradiation in the 0-1mm tip region. Our findings suggest that IAA accumulation in the transition zone is due to light-induced activation of Zmyuc gene expression in the 0-1mm root apex region. Light-induced changes in IAA levels and distributions mediate the maize root gravitropic U-turn.
Asunto(s)
Palabras clave
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Reguladores del Crecimiento de las Plantas / Cápsula de Raíz de Planta / Meristema / Gravitropismo / Zea mays / Ácidos Indolacéticos Idioma: En Revista: J Exp Bot Asunto de la revista: BOTANICA Año: 2016 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Reguladores del Crecimiento de las Plantas / Cápsula de Raíz de Planta / Meristema / Gravitropismo / Zea mays / Ácidos Indolacéticos Idioma: En Revista: J Exp Bot Asunto de la revista: BOTANICA Año: 2016 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido