RT Journal Article
T1 Role of ABA in the adaptive response of Arabidopsis plants to long-term boron toxicity treatment
A1 Martínez-Mazón, Paula
A1 Bahamonde, Cristina
A1 Herrera Rodríguez, María Begoña
A1 Fernández-Ocaña, Ana María
A1 Rexach, Jesús
A1 González-Fontes, Agustín
A1 Camacho-Cristóbal, Juan José
K1 Aquaporin
K1 Boron transporters
K1 Stomatal closure
K1 Water balance
AB Boron (B) toxicity causes impairments in several plant metabolic and physiological processes. Under conditions of excessive B availability, this micronutrient is passively transported through the transpiration stream and accumulates in leaves, causing the development of necrotic regions in leaf tips. Some plants have developed adaptive mechanisms to minimize the toxic effects of excessive B accumulation in their tissues. Thus, for instance, in Arabidopsis it has been described an ABA-dependent decrease in the transpiration rate that would restrict B accumulation in aerial plant tissues in response to short-term B toxicity, this effect being mediated by AtNCED3 (which encodes a key enzyme for ABA biosynthesis). The present work aimed to study the possible involvement of ABA in the adjustment of plant water balance and B homeostasis during the adaptive response of Arabidopsis to prolonged B toxicity. For this purpose, Arabidopsis wild-type and the ABA-deficient nced3-2 mutant plants were subjected to B toxicity for 7 days. We show that ABA-dependent stomatal closure is determinant for the adjustment of plant water relations under conditions of prolonged B toxicity. Results suggest that, in addition to the AtNCED3 gene, the AtNCED5 gene could also be involved in this ABA-dependent stomatal closure. Finally, our results also indicate the possible role of endogenous root ABA content in the mechanism of active efflux of B via BOR4 (efflux-type B transporter) from the root to the external environment under excess B conditions.
PB Elsevier
YR 2023
FD 2023
LK http://hdl.handle.net/10433/16547
UL http://hdl.handle.net/10433/16547
LA en
NO Plant Physiol Biochem. 202:107965
NO Departamento de Fisiología, Anatomía y Biología Celular, Universidad Pablo de Olavide
NO Departamento de Biología Animal, Biología Vegetal y Ecología, Facultad de Ciencias Experimentales, Campus de Las Lagunillas s/n, Universidad de Jaén
DS RIO
RD May 7, 2026