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Farmer, E. E.; Gasperini, D.; Acosta, I. F. The squeeze cell hypothesis for the activation of jasmonate synthesis in response to wounding New Phytol 204, 282-288, (2014) DOI: 10.1111/nph.12897
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 cm min–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.