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Detection of Histone Modifications in Plant Leaves
Published on: September 23, 2011
Gene-Expression Patterns and Levels of Jasmonic Acid in Rice Treated with the Resistance Inducer
P. Schweizer1, A. Buchala, J. P. Metraux
1Institut de Biologie Vegetale, Universite de Fribourg, Route Albert-Gockel 3, CH-1700 Fribourg, Switzerland.
Plant Physiology
|September 12, 2002
Summary
2,6-dichloroisonicotinic acid (INA) induces disease resistance in rice by activating specific gene pathways. Jasmonic acid (JA) enhances INA
Area of Science:
- Plant Pathology
- Molecular Biology
- Biochemistry
Background:
- Acquired disease resistance in rice (Oryza sativa) can be induced by compounds, but mechanisms are unclear.
- 2,6-dichloroisonicotinic acid (INA) is a synthetic inducer that protects rice against Magnaporthe grisea.
Purpose of the Study:
- To investigate the molecular mechanisms of INA-induced disease resistance in rice.
- To compare gene expression patterns induced by INA and pathogen attack.
- To elucidate the role of jasmonic acid (JA) in INA-mediated resistance.
Main Methods:
- Gene expression profiling in rice leaves treated with INA, M. grisea, or Pseudomonas syringae pv syringae.
- Measurement of lipoxygenase enzyme activity.
- Quantification of endogenous jasmonic acid (JA) levels.
- Assessment of plant protection against M. grisea.
Main Results:
- INA treatment and pathogen inoculation showed limited overlap in induced gene products (6 common, 26 unique).
- High-dose INA increased lipoxygenase activity and nonconjugated JA levels.
- Exogenous JA enhanced INA-induced gene expression and plant protection, especially at lower INA doses.
Conclusions:
- INA induces both pathogen-related and unrelated signaling pathways in rice.
- Jasmonic acid (JA) acts as an enhancer for INA-induced reactions, including plant defense.
- INA's mode of action involves complex signaling interactions beyond direct pathogen response.
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