Abscisic acid deficiency leads to rapid activation of tomato defence responses upon infection with Erwinia chrysanthemi.

Molecular Plant Pathology
Bob AsselberghFrédérique Van Gijsegem

Abstract

In addition to the important role of abscisic acid (ABA) in abiotic stress signalling, basal and high ABA levels appear to have a negative effect on disease resistance. Using the ABA-deficient sitiens tomato (Solanum lycopersicum) mutant and different application methods of exogenous ABA, we demonstrated the influence of this plant hormone on disease progression of Erwinia chrysanthemi. This necrotrophic plant pathogenic bacterium is responsible for soft rot disease on many plant species, causing maceration symptoms mainly due to the production and secretion of pectinolytic enzymes. On wild-type (WT) tomato cv. Moneymaker E. chrysanthemi leaf inoculation resulted in maceration both within and beyond the infiltrated zone of the leaf, but sitiens showed a very low occurrence of tissue maceration, which never extended the infiltrated zone. A single ABA treatment prior to infection eliminated the effect of pathogen restriction in sitiens, while repeated ABA spraying during plant development rendered both WT and sitiens very susceptible. Quantification of E. chrysanthemi populations inside the leaf did not reveal differences in bacterial growth between sitiens and WT. Sitiens was not more resistant to pectinolytic cell-wall degradat...Continue Reading

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Citations

May 8, 2009·Plant Physiology·Alexis Samba MialoundamaFlorence Bouvier
Jul 25, 2013·International Journal of Molecular Sciences·Philippe JeandetSylvain Cordelier
Jul 5, 2016·Frontiers in Plant Science·Aarti GuptaMuthappa Senthil-Kumar
Apr 20, 2018·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Inna A AbdeevaSergey A Bruskin
May 28, 2020·Frontiers in Plant Science·J Calleja-CabreraM Pernas
Jan 20, 2019·The Plant Journal : for Cell and Molecular Biology·Jiyoung ParkJulian I Schroeder

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