title: Root-Shoot Signaling crosstalk involved in the shoot growth promoting action of rhizospheric humic acids.
abstract: Numerous studies have shown the ability of humic substances to improve plant development. This action is normally reflected in an enhancement of crop yields and quality. However, the mechanisms responsible for this action of humic substances remain rather unknown. Our studies have shown that the shoot promoting action of sedimentary humic acids is dependent of its ability to increase root hydraulic conductivity through signaling pathways related to ABA, which in turn is affected in roots by humic acids in an IAA-NO dependent way. Furthermore, these studies also indicate that the primary action of humic acids in roots might also be physical, resulting from a transient mild stress caused by humic acids associated with a fouling-cleaning cycle of wall cell pores. Finally the role of alternative signal molecules, such as ROS, and corresponding signaling pathways are also discussed and modeled in the context of the above-mentioned framework.
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: Maite
authors.initials: M
authors.lastname: Olaetxea
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: Verónica
authors.initials: V
authors.lastname: Mora
authors.affiliation: b Department of Soil, Soil Biology Laboratory , Federal Rural University of Rio de Janeiro (Universidade Federal Rural do Rio de Janeiro - UFRRJ) , Brazil.
authors.forename: Andrés Calderin
authors.initials: AC
authors.lastname: García
authors.affiliation: b Department of Soil, Soil Biology Laboratory , Federal Rural University of Rio de Janeiro (Universidade Federal Rural do Rio de Janeiro - UFRRJ) , Brazil.
authors.forename: Leandro Azevedo
authors.initials: LA
authors.lastname: Santos
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: Roberto
authors.initials: R
authors.lastname: Baigorri
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: Marta
authors.initials: M
authors.lastname: Fuentes
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: María
authors.initials: M
authors.lastname: Garnica
authors.affiliation: b Department of Soil, Soil Biology Laboratory , Federal Rural University of Rio de Janeiro (Universidade Federal Rural do Rio de Janeiro - UFRRJ) , Brazil.
authors.forename: Ricardo Luis Louro
authors.initials: RL
authors.lastname: Berbara
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: Angel Maria
authors.initials: AM
authors.lastname: Zamarreño
authors.affiliation: a Department of Environmental Biology , Agricultural Chemistry and Biology Group-CMI Roullier, Faculty of Sciences, University of Navarra.
authors.forename: Jose M
authors.initials: JM
authors.lastname: Garcia-Mina
mesh_terms: D006812:Humic Substances; D008954:Models, Biological; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism*; D018520:Plant Shoots / Q000254:growth & development / Q000378:metabolism*; D058441:Rhizosphere; D015398:Signal Transduction
chemical_list: D006812:Humic Substances
keywords: Humic acid; humic substances; plant growth; plant hormones; rhizosphere; root growth; shoot growth; signaling crosstalk