Oxo-phytodienoic acid (OPDA) is formed on fatty acids esterified to galactolipids after tissue disruption in Arabidopsis thaliana.
Biotic and abiotic stress induces the formation of galactolipids esterified with the phytohormones 12-oxo-phytodienoic acid (OPDA) and dinor-oxo-phytodienoic acid (dnOPDA) in Arabidopsis thaliana. The biosynthetic pathways of free (dn)OPDA is well described, but it is unclear how they are incorporated into galactolipids. We herein show that (dn)OPDA containing lipids are formed rapidly after disruption of cellular integrity in leaf tissue. Five minutes after freeze-thawing, 60-70% of the trienoic acids esterified to chloroplast galactolipids are converted to (dn)OPDA. Stable isotope labeling with (18)O-water provides strong evidence for that the fatty acids remain attached to galactolipids during the enzymatic conversion to (dn)OPDA.
Department of Biological and Environmental Sciences, University of Gothenburg, Box 461, SE-405 30 Gothenburg, Sweden.
Anders K
AK
Nilsson
Per
P
Fahlberg
Mats
M
Ellerström
Mats X
MX
Andersson
D017360:Arabidopsis / Q000378:metabolism*; D002736:Chloroplasts / Q000378:metabolism; D003517:Cyclopentanes / Q000737:chemistry; D004952:Esters / Q000737:chemistry*; D005227:Fatty Acids / Q000737:chemistry / Q000378:metabolism*; D005230:Fatty Acids, Nonesterified / Q000737:chemistry; D005615:Freezing; D038983:Galactolipids / Q000737:chemistry*; D008055:Lipids / Q000737:chemistry; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry; D054883:Oxylipins / Q000737:chemistry; D010937:Plant Growth Regulators / Q000737:chemistry*; D018515:Plant Leaves; D018087:Plastids / Q000737:chemistry; D013997:Time Factors
D003517:Cyclopentanes; D004952:Esters; D005227:Fatty Acids; D005230:Fatty Acids, Nonesterified; D038983:Galactolipids; D008055:Lipids; D054883:Oxylipins; D010937:Plant Growth Regulators; C011006:jasmonic acid; D010100:Oxygen