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- Wasternack, C. (2)
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Wasternack, C.; Strnad, M. Jasmonates: News on Occurrence, Biosynthesis, Metabolism and Action of an Ancient Group of Signaling Compounds Int J Mol Sci 19, 2539, (2018) DOI: 10.3390/ijms19092539
Jasmonic acid (JA) and its related derivatives are
ubiquitously occurring compounds of land plants acting in numerous
stress responses and development. Recent studies on evolution of JA and
other oxylipins indicated conserved biosynthesis. JA formation is
initiated by oxygenation of α-linolenic acid (α-LeA, 18:3) or 16:3 fatty
acid of chloroplast membranes leading to 12-oxo-phytodienoic acid
(OPDA) as intermediate compound, but in Marchantiapolymorpha and
Physcomitrellapatens, OPDA and some of its derivatives are final
products active in a conserved signaling pathway. JA formation and its
metabolic conversion take place in chloroplasts, peroxisomes and
cytosol, respectively. Metabolites of JA are formed in 12 different
pathways leading to active, inactive and partially active compounds. The
isoleucine conjugate of JA (JA-Ile) is the ligand of the receptor
component COI1 in vascular plants, whereas in the bryophyte M.
polymorpha COI1 perceives an OPDA derivative indicating its functionally
conserved activity. JA-induced gene expressions in the numerous biotic
and abiotic stress responses and development are initiated in a
well-studied complex regulation by homeostasis of transcription factors
functioning as repressors and activators.
Strehmel, N.; Mönchgesang, S.; Herklotz, S.; Krüger, S.; Ziegler, J.; Scheel, D. Piriformospora indica Stimulates Root Metabolism of Arabidopsis thaliana Int J Mol Sci 17, 1091, (2016) DOI: 10.3390/ijms17071091
Piriformospora indica is a root-colonizing fungus, which interacts with a variety of plants including Arabidopsis thaliana. This interaction has been considered as mutualistic leading to growth promotion of the host. So far, only indolic glucosinolates and phytohormones have been identified as key players. In a comprehensive non-targeted metabolite profiling study, we analyzed Arabidopsis thaliana’s roots, root exudates, and leaves of inoculated and non-inoculated plants by ultra performance liquid chromatography/electrospray ionization quadrupole-time-of-flight mass spectrometry (UPLC/(ESI)-QTOFMS) and gas chromatography/electron ionization quadrupole mass spectrometry (GC/EI-QMS), and identified further biomarkers. Among them, the concentration of nucleosides, dipeptides, oligolignols, and glucosinolate degradation products was affected in the exudates. In the root profiles, nearly all metabolite levels increased upon co-cultivation, like carbohydrates, organic acids, amino acids, glucosinolates, oligolignols, and flavonoids. In the leaf profiles, we detected by far less significant changes. We only observed an increased concentration of organic acids, carbohydrates, ascorbate, glucosinolates and hydroxycinnamic acids, and a decreased concentration of nitrogen-rich amino acids in inoculated plants. These findings contribute to the understanding of symbiotic interactions between plant roots and fungi of the order of Sebacinales and are a valid source for follow-up mechanistic studies, because these symbioses are particular and clearly different from interactions of roots with mycorrhizal fungi or dark septate endophytes
Wasternack, C.; Stenzel, I.; Hause, B.; Hause, G.; Kutter, C.; Maucher, H.; Neumerkel, J.; Feussner, I.; Miersch, O. The wound response in tomato - Role of jasmonic acid J. Plant Physiol 163, 297-306 , (2006) DOI: 10.1016/j.jplph.2005.10.014
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