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Publikationen - Molekulare Signalverarbeitung

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Publikation

Harms, K.; Atzorn, R.; Brash, A.; Kühn, H.; Wasternack, C.; Willmitzer, L.; Peña-Cortés, H. Expression of a flax allene oxide synthase cDNA leads to an increase in the endogenous jasmonic acid level in transgenic potato plants but not to a corresponding activation of jasmonic acid-responding genes The Plant Cell 7, 1645-1654, (1995)

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Publikation

Ellis, C.; Karafyllidis, I.; Wasternack, C.; Turner, J.G. The Arabidopsis mutant cev1 links cell wall signaling to jasmonate and ethylene responses The Plant Cell 14, 1557-1566, (2002)

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Publikation

Schilling, S.; Wasternack, C.; Demuth, H.U. Glutaminyl cyclases from animals and plants: a case of functionally convergent protein evolution Biol. Chem 389, 983-991, (2008) DOI: 10.1515/BC.2008.111

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Publikation

Brüx, A.; Liu, T-Y.; Krebs, M.; Stierhof, Y.-D.; Lohmann, J.U.; Miersch, O.; Wasternack, C.; Schumacher, K. Reduced V-ATPase Activity in the trans-Golgi Network Causes Oxylipin-Dependent Hypocotyl Growth Inhibition in Arabidopsis The Plant Cell 20, 1088-1100, (2008) DOI: 10.1105/tpc.108.058362

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Publikation

Bosch, M.; Wright, L. P.; Gershenzon, J.; Wasternack, C.; Hause, B.; Schaller, A.; Stintzi, A. Jasmonic acid and its precursor 12-oxophytodienoic acid control different aspects of constitutive and induced herbivore defenses in tomato Plant Physiology 166, 396-410, (2014) DOI: 10.1104/pp.114.237388

The jasmonate family of growth regulators includes the isoleucine conjugate of jasmonic acid (JA-Ile) and its biosynthetic precursor 12-oxophytodienoic acid (OPDA) as signaling molecules. In order to assess the relative contribution of JA/JA-Ile and OPDA to insect resistance in tomato, we silenced the expression of OPDA reductase (OPR3) by RNA interference. Consistent with a block in the biosynthetic pathway downstream of OPDA, OPR3-RNAi plants contained wild-type levels of OPDA but failed to accumulate JA or JA-Ile after wounding. JA/JA-Ile deficiency in OPR3-RNAi plants resulted in reduced trichome formation and impaired monoterpene and sesquiterpene production. The loss of these JA/JA-Ile-dependent defense traits rendered them more attractive to the specialist herbivore Manduca sexta with respect to feeding and oviposition. Oviposition preference resulted from reduced levels of repellant mono- and sesquiterpenes. Feeding preference, on the other hand, was caused by increased production of cis-3-hexenal acting as a feeding stimulant for M. sexta larvae in OPR3-RNAi plants. Despite impaired constitutive defenses and increased palatability of OPR3-RNAi leaves, larval development was indistinguishable on OPR3-RNAi and wild-type plants, and much delayed as compared to development on the JA/JA-Ile insensitive (jai1) mutant. Apparently, signaling through JAI1, the tomato ortholog of COI1 in Arabidopsis, is required for defense while the conversion of OPDA to JA/JA-Ile is not. Comparing the signaling activities of OPDA and JA/JA-Ile, we found that OPDA can substitute for JA/JA-Ile in the local induction of defense gene expression, but the production of JA/JA-Ile is required for a systemic response.
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