A deletion in NRT2.1 attenuates pseudomonas syringae-induced hormonal perturbation, resulting in primed plant defenses
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Other documents of the author: Camañes, Gemma; Flors, Victor; García Agustín, Pilar; Cerezo García, Miguel; Vicedo, Begonya; Pastor, Victoria; García-Andrade, Javier
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http://dx.doi.org/10.1104/pp.111.184424 |
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Title
A deletion in NRT2.1 attenuates pseudomonas syringae-induced hormonal perturbation, resulting in primed plant defensesAuthor (s)
Date
2012Publisher
American Society of Plant BiologistsISSN
0032-0889; 1532-2548Type
info:eu-repo/semantics/articlePublisher version
http://www.plantphysiol.org/content/158/2/1054.full.pdf+htmlAbstract
For an efficient defense response against pathogens, plants must coordinate rapid genetic reprogramming to produce an
incompatible interaction. Nitrate Trasnporter2 (NRT2) gene family members are sentinels of nitrate ... [+]
For an efficient defense response against pathogens, plants must coordinate rapid genetic reprogramming to produce an
incompatible interaction. Nitrate Trasnporter2 (NRT2) gene family members are sentinels of nitrate availability. In this study, we
present an additional role for NRT2.1 linked to plant resistance against pathogens. This gene antagonizes the priming of plant
defenses against the bacterial pathogen Pseudomonas syringae pv tomato DC3000 (Pst). The nrt2 mutant (which is deficient in
two genes, NRT2.1 and NRT2.2) displays reduced susceptibility to this bacterium. We demonstrate that modifying environmental conditions that stimulate the derepression of the NRT2.1 gene influences resistance to Pst independently of the total
level of endogenous nitrogen. Additionally, hormonal homeostasis seemed to be affected in nrt2, which displays priming of
salicylic acid signaling and concomitant irregular functioning of the jasmonic acid and abscisic acid pathways upon infection.
Effector-triggered susceptibility and hormonal perturbation by the bacterium seem to be altered in nrt2, probably due to
reduced sensitivity to the bacterial phytotoxin coronatine. The main genetic and metabolic targets of coronatine in Arabidopsis
(Arabidopsis thaliana) remain largely unstimulated in nrt2 mutants. In addition, a P. syringae strain defective in coronatine
synthesis showed the same virulence toward nrt2 as the coronatine-producing strain. Taken together, the reduced susceptibility
of nrt2 mutants seems to be a combination of priming of salicylic acid-dependent defenses and reduced sensitivity to the
bacterial effector coronatine. These results suggest additional functions for NRT2.1 that may influence plant disease resistance
by down-regulating biotic stress defense mechanisms and favoring abiotic stress responses. [-]
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Plant Physiology, february 2012, Vol. 158Rights
© 2011 American Society of Plant Biologists. All Rights Reserved.
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