期刊
PLANT JOURNAL
卷 34, 期 3, 页码 363-375出版社
WILEY
DOI: 10.1046/j.1365-313X.2003.01730.x
关键词
isoprostane; jasmonic acid; phytoprostane; prostaglandin; 12-oxo-phytodienoic
Lipid peroxidation may be initiated either by lipoxygenases or by reactive oxygen species (ROS). Enzymatic oxidation of alpha-linolenate can result in the biosynthesis of cyclic oxylipins of the jasmonate type while free-radical-catalyzed oxidation of alpha-linolenate may yield several classes of cyclic oxylipins termed phytoprostanes in vivo . Previously, we have shown that one of these classes, the E-1-phytoprostanes (PPE1), occurs ubiquitously in plants. In this work, it is shown that PPE1 are converted to novel cyclopentenone A(1)- and B-1-phytoprostanes (PPA(1) and PPB1 ) in planta . Enhanced formation of PPE1, PPA(1), and PPB1 is observed after peroxide stress in tobacco cell cultures as well as after infection of tomato plants with a necrotrophic fungus, Botrytis cinerea . PPA(1) and PPB1 display powerful biologic activities including activation of mitogen-activated protein kinase (MAPK) and induction of glutathione-S-transferase (GST), defense genes, and phytoalexins. Data collected so far infer that enhanced phytoprostane formation is a general consequence of oxidative stress in plants. We propose that phytoprostanes are components of an oxidant-injury-sensing, archaic signaling system that serves to induce several plant defense mechanisms.
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