title: Root Responses to Boron Deficiency Mediated by Ethylene.
abstract: Low boron (B) supply alters the architecture of the root system in Arabidopsis thaliana seedlings, leading to a reduction in the primary root growth and an increase in the length and number of root hairs. At short-term (hours), B deficiency causes a decrease in the cell elongation of the primary root, resulting in a lower growth. Experimental approaches using ethylene insensitive Arabidopsis mutants, inhibitors of ethylene response, and GUS reporter lines suggest that ethylene is involved in these responses of the primary root to B deficiency. Furthermore, it has been shown that auxin participates in the inhibition of cell elongation under short-term B deprivation. These results support that an interaction between ethylene and auxin plays an important role in controlling the primary root elongation, in which a number of genes related to the synthesis, transport, and signaling of both phytohormones could modulate this effect. Evidence for a root cross-talk among both hormones and other possible intermediates (abscisic acid, calcium sensors, and reactive oxygen species) in response to B deficiency is provided and discussed.
authors.affiliation: Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide Sevilla, Spain.
authors.forename: Agustín
authors.initials: A
authors.lastname: González-Fontes
authors.affiliation: Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide Sevilla, Spain.
authors.forename: M B
authors.initials: MB
authors.lastname: Herrera-Rodríguez
authors.affiliation: Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide Sevilla, Spain.
authors.forename: Esperanza M
authors.initials: EM
authors.lastname: Martín-Rejano
authors.affiliation: Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide Sevilla, Spain.
authors.forename: M T
authors.initials: MT
authors.lastname: Navarro-Gochicoa
authors.affiliation: Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide Sevilla, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: Rexach
authors.affiliation: Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide Sevilla, Spain.
authors.forename: Juan J
authors.initials: JJ
authors.lastname: Camacho-Cristóbal
keywords: abscisic acid; auxin; boron deficiency; calcium signaling; ethylene; primary root; reactive oxygen species; root hairs