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Research Paper
A Tolerant Behaviour in Salt-Sensitive Tomato Plants can be Mimicked by Chemical Stimuli
Victor Flors, M. Paradis, J. Garcia-Andrade, Miguel Cerezo, C. Gonzalez-Bosch, Pilar García-Agustín and C. Gonzalez-Bosch
volume 2 | issue 1
january/february 2007Pages: 50 - 57
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Lycopersicon esculentum plants exhibit increased salt stress tolerance following treatment with adipic acid monoethylester and 1,3-diaminepropane (DAAME), known as an inducer of resistance against biotic stress in tomato and pepper. For an efficient water and nutrient uptake, plants should adapt their water potential to compensate a decrease in water soil potential produced by salt stress. DAAME-treated plants showed a faster and stronger water potential reduction and an enhanced proline accumulation. Salinity-induced oxidative stress was also ameliorated by DAAME treatments. Oxidative membrane damage and ethylene emission were both reduced in DAAME-treated plants. This effect is probably a consequence of an increase of both non enzymatic antioxidant activity as well as peroxidase activity. DAAME-mediated tolerance resulted in an unaltered photosynthetic rate and a stimulation of the decrease in transpiration under stress conditions without a cost in growth due to salt stress. The reduction in transpiration rate was concomitant with a reduction in phytotoxic Na+ and Cl- accumulation under saline stress. Interestingly, the ABA deficient tomato mutant sitiens was insensitive to DAAME-induced tolerance following NaCl stress exposure. Additionally, DAAME treatments increased the ABA content of leaves, therefore, an intact ABA signalling pathway seems to be important to express DAAME-induced salt tolerance. Here, we show a possibility of enhance tomato stress tolerance by chemical induction of the major plant defences against salt stress. DAAME-induced tolerance against salt stress could be complementary to or share elements with induced resistance against biotic stress. This might be the reason for the observed wide spectrum of effectiveness of this compound.
Authors
Victor Flors
University of Jaume; Castellón, Spain
M. Paradis
University of Jaume, Castellon, Spain
J. Garcia-Andrade
University of Jaume, Castellon, Spain
Miguel Cerezo
Universitat Jaume I; Castellón, Spain
C. Gonzalez-Bosch
Universidad de Valencia, Valencia, Spain
Pilar García-Agustín
University of Jaume; Castellón, Spain
C. Gonzalez-Bosch
Universidad de Valencia, Valencia, Spain
We now provide open access to journal articles published online for one year or more. This article may be downloaded at the following link:
Download PDF If the document does not open, please right-click on the link (control-click on a Macintosh) and select the option to save the file to disk.