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Monitoring Plant Hormones During Stress Responses
Published on: June 15, 2009
Jasmonic acid interacts with abscisic acid to regulate plant responses to water stress conditions
Carlos de Ollas1, Vicent Arbona1, Aurelio Gómez-Cadenas1
1a Departamento de Ciencias Agrarias y del Medio Natural ; Universitat Jaume I ; Castelló de la Plana, Spain.
Abstract:
Phytohormones are key players in signaling environmental stress conditions. Hormone profiling together with proline accumulation were studied in leaves and roots of different mutant lines of Arabidopsis. Regulation of proline accumulation in this system seems complex and JA-deficient (jar1-1) and JA-insensitive (jai1) lines accumulating high levels of proline despite their very low ABA levels seems to discard an ABA-dependent response. However, the pattern of proline accumulation in jai1 seedlings parallels that of ABA. Under stress conditions, there is an opposite pattern of ABA accumulation in roots of jar1-1/coi1-16 (in which ABA only slightly increase) and jai1 (in which ABA increase is even higher than in WT plants). This also makes JA-ABA crosstalk complex and discards any lineal pathway that could explain this hormonal interaction.
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