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THE PLANT CELL, Vol 9, Issue 12 2243-2259, Copyright © 1997 by American Society of Plant Biologists
Antagonistic Effects of Abscisic Acid and Jasmonates on Salt Stress-Inducible Transcripts in Rice Roots
A. Moons, E. Prinsen, G. Bauw and M. Van Montagu
Laboratorium voor Genetica, Department of Genetics, Flanders Interuniversity Institute for Biotechnology (VIB), Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
Abscisic acid (ABA) and jasmonates have been implicated in responses to
water deficit and wounding. We compared the molecular and physiological
effects of jasmonic acid (JA) ([less than or equal to]10 [mu]M), ABA, and
salt stress in roots of rice. JA markedly induced a cationic peroxidase,
two novel 32- and 28-kD proteins, acidic PR-1 and PR-10
pathogenesis-related proteins, and the salt stress-responsive SalT protein
in roots. Most JA-responsive proteins (JIPs) from roots also accumulated
when plants were subjected to salt stress. None of the JIPs accumulated
when plants were treated with ABA. JA did not induce an ABA-responsive
group 3 late-embryogenesis abundant (LEA) protein. Salt stress and ABA but
not JA induced oslea3 transcript accumulation. By contrast, JA, ABA, and
salt stress induced transcript accumulation of salT and osdrr, which
encodes a rice PR-10 protein. However, ABA also negatively affected salT
transcript accumulation, whereas JA negatively affected ABA-induced oslea3
transcript levels. Endogenous root ABA and methyl jasmonate levels showed a
differential increase with the dose and the duration of salt stress. The
results indicate that ABA and jasmonates antagonistically regulated the
expression of salt stress-inducible proteins associated with water deficit
or defense responses.
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