AUTHOR=Dave Anuja , Graham Ian A.

TITLE=Oxylipin Signaling: A Distinct Role for the Jasmonic Acid Precursor cis-(+)-12-Oxo-Phytodienoic Acid (cis-OPDA)

JOURNAL=Frontiers in Plant Science

VOLUME=3

YEAR=2012

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2012.00042

DOI=10.3389/fpls.2012.00042

ISSN=1664-462X

ABSTRACT=<p>Oxylipins are lipid-derived compounds, many of which act as signals in the plant response to biotic and abiotic stress. They include the phytohormone jasmonic acid (JA) and related jasmonate metabolites <italic>cis</italic>-(+)-12-oxo-phytodienoic acid (<italic>cis</italic>-OPDA), methyl jasmonate, and jasmonoyl-<italic>L</italic>-isoleucine (JA-Ile). Besides the defense response, jasmonates are involved in plant growth and development and regulate a range of processes including glandular trichome development, reproduction, root growth, and senescence. <italic>cis</italic>-OPDA is known to possess a signaling role distinct from JA-Ile. The non-enzymatically derived phytoprostanes are structurally similar to <italic>cis-</italic>OPDA and induce a common set of genes that are not responsive to JA in <italic>Arabidopsis thaliana</italic>. A novel role for <italic>cis</italic>-OPDA in seed germination regulation has recently been uncovered based on evidence from double mutants and feeding experiments showing that <italic>cis</italic>-OPDA interacts with abscisic acid (ABA), inhibits seed germination, and increases ABA INSENSITIVE5 (ABI5) protein abundance. Large amounts of <italic>cis</italic>-OPDA are esterified to galactolipids in <italic>A. thaliana</italic> and the resulting compounds, known as Arabidopsides, are thought to act as a rapidly available source of <italic>cis</italic>-OPDA.</p>