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Gasperini, D.; Chauvin, A.; Acosta, I. F.; Kurenda, A.; Stolz, S.; Chételat, A.; Wolfender, J.-L.; Farmer, E. E. Axial and Radial Oxylipin Transport Plant Physiol 169, 2244-2254, (2015) DOI: 10.1104/pp.15.01104
Jasmonates are oxygenated lipids (oxylipins)
that control defense gene expression in response to cell damage in
plants. How mobile are these potent mediators within tissues? Exploiting
a series of 13-lipoxygenase (13-lox) mutants in Arabidopsis
(Arabidopsis thaliana) that displays impaired jasmonic acid (JA)
synthesis in specific cell types and using JA-inducible reporters, we
mapped the extent of the transport of endogenous jasmonates across the
plant vegetative growth phase. In seedlings, we found that jasmonate (or
JA precursors) could translocate axially from wounded shoots to
unwounded roots in a LOX2-dependent manner. Grafting experiments with
the wild type and JA-deficient mutants confirmed shoot-to-root oxylipin
transport. Next, we used rosettes to investigate radial cell-to-cell
transport of jasmonates. After finding that the LOX6 protein localized
to xylem contact cells was not wound inducible, we used the lox234
triple mutant to genetically isolate LOX6 as the only JA
precursor-producing LOX in the plant. When a leaf of this mutant was
wounded, the JA reporter gene was expressed in distal leaves. Leaf
sectioning showed that JA reporter expression extended from contact
cells throughout the vascular bundle and into extravascular cells,
revealing a radial movement of jasmonates. Our results add a crucial
element to a growing picture of how the distal wound response is
regulated in rosettes, showing that both axial (shoot-to-root) and
radial (cell-to-cell) transport of oxylipins plays a major role in the
wound response. The strategies developed herein provide unique tools
with which to identify intercellular jasmonate transport routes.