Quantification of jasmonic acid by SPME in tomato plants stressed by ozone |
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| Authors: | Zadra Claudia Borgogni Andrea Marucchini Cesare |
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| Institution: | Department of Agricultural and Environmental Science, and Department of Plant Biology and Agro-Environmental and Animal Biotechnology, University of Perugia, Borgo XX Giugno 72, 06121 Perugia, Italy. zadra@unipg.it |
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| Abstract: | Jasmonates are signalling molecules induced in plants as a response to various biotic and/or abiotic stresses. As ozone is known to activate defense responses in plants, we have monitored the concentration of jasmonic acid in tomato leaves during and after an acute exposure to this abiotic elicitor. In this experiment, we observed that the maximum induction of jasmonic acid in O3-fumigated plants occurred 9 h after the end of treatment and the concentration of jasmonic acid in stressed plants increased 13-fold. However, the level of endogenous methyl-jasmonate was constant during the observed period. The extraction and quantification of jasmonic acid as its methyl ester was performed by headspace-solid-phase microextraction (or HS-SPME) in combination with GC-FID and GC-MS. The sensitivity (LOD = 2 ng/g) of this method permitted the detection and quantification of jasmonic acid present in plant tissues at very low concentrations. |
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