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Enhancement of root hydraulic conductivity by methyl jasmonate and the role of calcium and abscisic acid in this process
Author(s) -
SÁNCHEZROMERA BEATRIZ,
RUIZLOZANO JUAN MANUEL,
LI GUOWEI,
LUU DOANTRUNG,
MARTÍNEZBALLESTA MARIA DEL CARMEN,
CARVAJAL MICAELA,
ZAMARREÑO ANGEL MARÍA,
GARCÍAMINA JOSE MARÍA,
MAUREL CHRISTOPHE,
AROCA RICARDO
Publication year - 2014
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12214
Subject(s) - methyl jasmonate , abscisic acid , jasmonic acid , chemistry , jasmonate , arabidopsis thaliana , calcium , biosynthesis , biochemistry , botany , microbiology and biotechnology , biology , arabidopsis , salicylic acid , mutant , enzyme , gene , organic chemistry
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 P haseolus vulgaris , S olanum lycopersicum and A rabidopsis 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.