
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.
Plant Leaves/enzymology/genetics/physiology, Plant Growth Regulators/metabolism, Lipoxygenase, Arabidopsis, Xylem/enzymology/genetics/physiology, Cyclopentanes, Oxylipins/metabolism, Cyclopentanes/metabolism, Plant Roots, Plant Growth Regulators, Plant Shoots/enzymology/genetics/physiology, Gene Expression Regulation, Plant, Stress, Physiological, Xylem, 615, Oxylipins, Arabidopsis Proteins/genetics/metabolism, Arabidopsis Proteins, Arabidopsis/enzymology/genetics/physiology, Biological Transport, Lipoxygenases, Lipoxygenases/genetics/metabolism, Plant Leaves, Seedlings, Lipoxygenase/genetics/metabolism, Plant Roots/enzymology/genetics/physiology, Plant Shoots, Seedlings/enzymology/genetics/physiology, ddc: ddc:615
Plant Leaves/enzymology/genetics/physiology, Plant Growth Regulators/metabolism, Lipoxygenase, Arabidopsis, Xylem/enzymology/genetics/physiology, Cyclopentanes, Oxylipins/metabolism, Cyclopentanes/metabolism, Plant Roots, Plant Growth Regulators, Plant Shoots/enzymology/genetics/physiology, Gene Expression Regulation, Plant, Stress, Physiological, Xylem, 615, Oxylipins, Arabidopsis Proteins/genetics/metabolism, Arabidopsis Proteins, Arabidopsis/enzymology/genetics/physiology, Biological Transport, Lipoxygenases, Lipoxygenases/genetics/metabolism, Plant Leaves, Seedlings, Lipoxygenase/genetics/metabolism, Plant Roots/enzymology/genetics/physiology, Plant Shoots, Seedlings/enzymology/genetics/physiology, ddc: ddc:615
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 55 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 10% |
