The squeeze cell hypothesis for the activation of jasmonate synthesis in response to wounding

Détails

ID Serval
serval:BIB_A890D9E0EF8C
Type
Article: article d'un périodique ou d'un magazine.
Sous-type
Synthèse (review): revue aussi complète que possible des connaissances sur un sujet, rédigée à partir de l'analyse exhaustive des travaux publiés.
Collection
Publications
Institution
Titre
The squeeze cell hypothesis for the activation of jasmonate synthesis in response to wounding
Périodique
New Phytologist
Auteur(s)
Farmer E.E., Gasperini D., Acosta I.F.
ISSN
1469-8137 (electronic)
ISSN-L
0028-646X
Statut éditorial
Publié
Date de publication
2014
Volume
204
Numéro
2
Pages
282-288
Langue
anglais
Résumé
Jasmonates are lipid mediators that control defence gene expression in response to wounding and other environmental stresses. These small molecules can accumulate at distances up to several cm from sites of damage and this is likely to involve cell-to-cell jasmonate transport. Also, and independently of jasmonate synthesis, transport and perception, different long-distance wound signals that stimulate distal jasmonate synthesis are propagated at apparent speeds of several cmmin(-1) to tissues distal to wounds in a mechanism that involves clade 3 GLUTAMATE RECEPTOR-LIKE (GLR) genes. A search for jasmonate synthesis enzymes that might decode these signals revealed LOX6, a lipoxygenase that is necessary for much of the rapid accumulation of jasmonic acid at sites distal to wounds. Intriguingly, the LOX6 promoter is expressed in a distinct niche of cells that are adjacent to mature xylem vessels, a location that would make these contact cells sensitive to the release of xylem water column tension upon wounding. We propose a model in which rapid axial changes in xylem hydrostatic pressure caused by wounding travel through the vasculature and lead to slower, radially dispersed pressure changes that act in a clade 3 GLR-dependent mechanism to promote distal jasmonate synthesis.
Mots-clé
electrical signal, glutamate receptor-like, hydraulic signal, jasmonate, mechanosensor, plasmodesmata, squeeze cell hypothesis, wounding
Web of science
Open Access
Oui
Création de la notice
30/10/2014 11:38
Dernière modification de la notice
20/08/2019 16:13
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