Tricarboxylates Induce Defense Priming Against Bacteria in Arabidopsis thaliana
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Títol
Tricarboxylates Induce Defense Priming Against Bacteria in Arabidopsis thalianaData de publicació
2018-08-20Editor
Frontiers MediaCita bibliogràfica
BALMER, Andrea; PASTOR, Victoria; GLAUSER, Gaetan; MAUCH-MANI, Brigitte (2018). Tricarboxylates Induce Defense Priming Against Bacteria in Arabidopsis thaliana. Frontiers in Plant Science, v. 9Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://www.frontiersin.org/articles/10.3389/fpls.2018.01221/fullVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
Exposure of plants to biotic stress results in an effective induction of numerous
defense mechanisms that involve a vast redistribution within both primary and
secondary metabolisms. For ... [+]
Exposure of plants to biotic stress results in an effective induction of numerous
defense mechanisms that involve a vast redistribution within both primary and
secondary metabolisms. For instance, an alteration of tricarboxylic acid (TCA) levels
can accompany the increase of plant resistance stimulated by various synthetic and
natural inducers. Moreover, components of the TCA flux may play a role during the
set-up of plant defenses. In this study, we show that citrate and fumarate, two major
components of the TCA cycle, are able to induce priming in Arabidopsis against
the bacterial pathogen
Pseudomonas syringae
pv.
tomato
DC3000. Both citrate and
fumarate show no direct antimicrobial effect and therefore enhanced bacterial resistance
found
in planta
is solely based on the induction of the plant defense system. During
the priming phase, both TCA intermediates did not induce any changes in transcript
abundances of a set of defense genes, and in phytohormones and camalexin levels.
However, at early time points of bacterial challenge, citrate induced a stronger salicylic
acid and camalexin accumulation followed later by a boost of the jasmonic acid pathway.
On the other hand, adaptations of hormonal pathways in fumarate-treated plants were
more complex. While jasmonic acid was not induced, mutants impaired in jasmonic acid
perception failed to mount a proper priming response induced by fumarate. Our results
suggest that changes in carboxylic acid abundances can enhance Arabidopsis defense
through complex signaling pathways. This highlights a promising feature of TCAs as
novel defense priming agents and calls for further exploration in other pathosystems
and stress situations. [-]
Publicat a
Frontiers in Plant Science (2018), v. 9Proyecto de investigación
This work has been supported by SNSF grant Nr. 31003A_160162Drets d'accés
info:eu-repo/semantics/openAccess
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