title: The Rise and Fall of Jasmonate Biological Activities.
abstract: Jasmonates (JAs) constitute a major class of plant regulators that coordinate responses to biotic and abiotic threats and important aspects of plant development. The core biosynthetic pathway converts linolenic acid released from plastid membrane lipids to the cyclopentenone cis-oxo-phytodienoic acid (OPDA) that is further reduced and shortened to jasmonic acid (JA) in peroxisomes. Abundant pools of OPDA esterified to plastid lipids also occur upon stress, mainly in the Arabidopsis genus. Long thought to be the bioactive hormone, JA only gains its pleiotropic hormonal properties upon conjugation into jasmonoyl-isoleucine (JA-Ile). The signaling pathway triggered when JA-Ile promotes the assembly of COI1-JAZ (Coronatine Insensitive 1-JAsmonate Zim domain) co-receptor complexes has been the focus of most recent research in the jasmonate field. In parallel, OPDA and several other JA derivatives are recognized for their separate activities and contribute to the diversity of jasmonate action in plant physiology. We summarize in this chapter the properties of different bioactive JAs and review elements known for their perception and signal transduction. Much progress has also been gained on the enzymatic processes governing JA-Ile removal. Two JA-Ile catabolic pathways, operating through ω-oxidation (cytochromes P450) or conjugate cleavage (amido hydrolases) shape signal dynamics to allow optimal control on defense. JA-Ile turnover not only participates in signal attenuation, but also impact the homeostasis of the entire JA metabolic pathway.
authors.affiliation: Institut de Biologie Moléculaire des Plantes CNRS-UPR 2357, associé à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France. thierry.heitz@ibmp-cnrs.unistra.fr.
authors.forename: Thierry
authors.initials: T
authors.lastname: Heitz
authors.affiliation: Institut de Biologie Moléculaire des Plantes CNRS-UPR 2357, associé à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France.
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Smirnova
authors.affiliation: Institut de Biologie Moléculaire des Plantes CNRS-UPR 2357, associé à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France.
authors.forename: Emilie
authors.initials: E
authors.lastname: Widemann
authors.affiliation: Institut de Biologie Moléculaire des Plantes CNRS-UPR 2357, associé à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France.
authors.forename: Yann
authors.initials: Y
authors.lastname: Aubert
authors.affiliation: Institut de Biologie Moléculaire des Plantes CNRS-UPR 2357, associé à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Pinot
authors.affiliation: Institut de Biologie Moléculaire des Plantes CNRS-UPR 2357, associé à l'Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg, France.
authors.forename: Rozenn
authors.initials: R
authors.lastname: Ménard
mesh_terms: D003517:Cyclopentanes / Q000378:metabolism*; D005227:Fatty Acids / Q000378:metabolism; D054883:Oxylipins / Q000378:metabolism*; D010937:Plant Growth Regulators / Q000378:metabolism*; D010944:Plants / Q000378:metabolism; D015398:Signal Transduction
chemical_list: D003517:Cyclopentanes; D005227:Fatty Acids; D054883:Oxylipins; D010937:Plant Growth Regulators; C011006:jasmonic acid
keywords: Biological activity; CYP94; Catabolism; Hormone homeostasis; JA-Ile; Jasmonic acid; OPDA