Enhancement of root hydraulic conductivity by methyl jasmonate and the role of calcium and abscisic acid in this process.
2014
Sánchez-Romera, Beatriz | Ruiz-Lozano, Juan Manuel | Li, Guowei | Luu, Doan-Trung | Martínez-Ballesta, Maria del Carmen | Carvajal, Micaela | Zamarreño, Angel María | García-Mina, Jose María | Maurel, Christophe | Aroca, Ricardo | Departamento de Microbiología del Suelo y Sistemas Simbióticos ; Estación Experimental del Zaidín | Biochimie et Physiologie Moléculaire des Plantes (BPMP) ; Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Departemento de Nutricion Vegetal ; Centro de Edafologia y Biologia Aplicada del Segura | R&D ; TAI Roullier Group
International audience
Afficher plus [+] Moins [-]anglais. The role of jasmonic acid in the induction of stomatal closure is well known. However, its role in regulating root hydraulic conductivity (L) has not yet been explored. The objectives of the present research were to evaluate how JA regulates L and how calcium and abscisic acid (ABA) could be involved in such regulation. We found that exogenous methyl jasmonate (MeJA) increased L of Phaseolus vulgaris, Solanum lycopersicum and Arabidopsis thaliana roots. Tomato plants defective in JA biosynthesis had lower values of L than wild-type plants, and that L was restored by addition of MeJA. The increase of L by MeJA was accompanied by an increase of the phosphorylation state of the aquaporin PIP2. We observed that MeJA addition increased the concentration of cytosolic calcium and that calcium channel blockers inhibited the rise of L caused by MeJA. Treatment with fluoridone, an inhibitor of ABA biosynthesis, partially inhibited the increase of L caused by MeJA, and tomato plants defective in ABA biosynthesis increased their L after application of MeJA. It is concluded that JA enhances L and that this enhancement is linked to calcium and ABA dependent and independent signalling pathways.
Afficher plus [+] Moins [-]Mots clés AGROVOC
Informations bibliographiques
Cette notice bibliographique a été fournie par Institut national de la recherche agronomique
Découvrez la collection de ce fournisseur de données dans AGRIS