MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis

One of the most striking aspects of plant plasticity is the modulation of development in response to environmental changes. Plant growth and development largely depend on the phytohormone auxin that exerts its function through a partially redundant family of F-box receptors, the TIR1-AFBs. We have p...

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Detalles Bibliográficos
Autores principales: Iglesias, M.J., Terrile, M.C., Windels, D., Lombardo, M.C., Bartoli, Carlos Guillermo, Vazquez, F., Estelle, M., Casalongué, C. A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Botánica
Adaptación al cambio climático
Desarrollo de la Planta
Arabidopsis
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85194
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85194
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Botánica
Adaptación al cambio climático
Desarrollo de la Planta
Arabidopsis
spellingShingle Botánica
Adaptación al cambio climático
Desarrollo de la Planta
Arabidopsis
Iglesias, M.J.
Terrile, M.C.
Windels, D.
Lombardo, M.C.
Bartoli, Carlos Guillermo
Vazquez, F.
Estelle, M.
Casalongué, C. A.
MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis
topic_facet Botánica
Adaptación al cambio climático
Desarrollo de la Planta
Arabidopsis
description One of the most striking aspects of plant plasticity is the modulation of development in response to environmental changes. Plant growth and development largely depend on the phytohormone auxin that exerts its function through a partially redundant family of F-box receptors, the TIR1-AFBs. We have previously reported that the Arabidopsis double mutant tir1 afb2 is more tolerant to salt stress than wild-type plants and we hypothesized that down-regulation of auxin signaling might be part of Arabidopsis acclimation to salinity. In this work, we show that NaCl-mediated salt stress induces miR393 expression by enhancing the transcription of AtMIR393A and leads to a concomitant reduction in the levels of the TIR1 and AFB2 receptors. Consequently, NaCl triggers stabilization of Aux/IAA repressors leading to down-regulation of auxin signaling. Further, we report that miR393 is likely involved in repression of lateral root (LR) initiation, emergence and elongation during salinity, since the mir393ab mutant shows reduced inhibition of emergent and mature LR number and length upon NaCl-treatment. Additionally, mir393ab mutant plants have increased levels of reactive oxygen species (ROS) in LRs, and reduced ascorbate peroxidase (APX) enzymatic activity compared with wild-type plants during salinity. Thus, miR393 regulation of the TIR1 and AFB2 receptors could be a critical checkpoint between auxin signaling and specfic redoxassociated components in order to coordinate tissue and time-specific growth responses and tolerance during acclimation to salinity in Arabidopsis.
format Articulo
Articulo
author Iglesias, M.J.
Terrile, M.C.
Windels, D.
Lombardo, M.C.
Bartoli, Carlos Guillermo
Vazquez, F.
Estelle, M.
Casalongué, C. A.
author_facet Iglesias, M.J.
Terrile, M.C.
Windels, D.
Lombardo, M.C.
Bartoli, Carlos Guillermo
Vazquez, F.
Estelle, M.
Casalongué, C. A.
author_sort Iglesias, M.J.
title MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis
title_short MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis
title_full MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis
title_fullStr MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis
title_full_unstemmed MiR393 regulation of auxin signaling and redox-related components during acclimation to salinity in Arabidopsis
title_sort mir393 regulation of auxin signaling and redox-related components during acclimation to salinity in arabidopsis
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/85194
work_keys_str_mv AT iglesiasmj mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT terrilemc mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT windelsd mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT lombardomc mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT bartolicarlosguillermo mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT vazquezf mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT estellem mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
AT casalongueca mir393regulationofauxinsignalingandredoxrelatedcomponentsduringacclimationtosalinityinarabidopsis
bdutipo_str Repositorios
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