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PLANT PHYSIOLOGY , Vol 115, Issue 1 61-70, Copyright © 1997 by American Society of Plant Biologists
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PLANT-MICROBE AND PLANT-INSECT INTERACTIONS |
Gene-Expression Patterns and Levels of Jasmonic Acid in Rice Treated with the Resistance Inducer 2,6-Dichloroisonicotinic Acid
P. Schweizer, A. Buchala and J. P. Metraux
Institut de Biologie Vegetale, Universite de Fribourg, Route Albert-Gockel 3, CH-1700 Fribourg, Switzerland
Acquired disease resistance can be induced in rice (Oryza sativa) by a
number of synthetic or natural compounds, but the molecular mechanisms
behind the phenomenon are poorly understood. One of the synthetic inducers
of resistance, 2,6-dichloroisonicotinic acid (INA), efficiently protected
rice leaves from infection by the rice blast fungus Magnaporthe grisea
(Hebert) Barr. A comparison of gene-expression patterns in plants treated
with INA versus plants inoculated with the compatible pathogen M. grisea or
the incompatible pathogen Pseudomonas syringae pv syringae revealed only a
marginal overlap: 6 gene products, including pathogenesis-related proteins
(PR1-PR9), accumulated in both INA-treated and pathogen-attacked leaves,
whereas 26 other gene products accumulated only in INA-treated or only in
pathogen-attacked leaves. Lipoxygenase enzyme activity and levels of
nonconjugated jasmonic acid (JA) were enhanced in leaves of plants treated
with a high dose of INA (100 ppm). Exogenously applied JA enhanced the gene
induction and plant protection caused by lower doses of INA (0.1 to 10 ppm)
that by themselves did not give rise to enhanced levels of endogenous
(-)-JA. These data suggest that INA, aside from activating a
pathogen-induced signaling pathway, also induces events that are not
related to pathogenesis. JA acts as an enhancer of both types of
INA-induced reactions in rice.
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