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Publikationen - Molekulare Signalverarbeitung

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Publikation

Meixner, C.; Ludwig-Müller, J.; Miersch, O.; Gresshoff, P.; Staehlin, C.; Vierheilig, H. Lack of mycorrhizal autoregulation and phytohormonal changes in the supernodulating soybean mutant nts1007 Planta 222, 709-715, (2005)

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Publikation

Schneider, K.; Kienow, L.; Schmelzer, E.; Colby, T.; Bartsch, M.; Miersch, O.; Wasternack, C.; Kombrink, E.; Stuible, H.-P. A new type of peroxisomal acyl-coenzyme A synthetase from <EM>Arabidopsis thaliana</EM> has the catalytic capacity of activate biosynthetic precursors of jasmonic acid J. Biol. Chem. 280, 13962-13972, (2005)

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Publikation

Andrade, A.; Vigliocco, A.; Alemano, S.; Miersch, O.; Botella, M.A. Endogenous jasmonates and octadecanoids during germination and seedling development: their relation with hypersensitive tomato mutants to abiotic stress Seed Sci. Res. 15, 309-318, (2005)

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Publikation

Fortes, A.M.; Miersch, O.; Lange, P.R.; Malho, R.; Testillano, P.S.; del Risueno, M.C.; Wasternack, C.; Pais, M.S. Expression of allene oxide cyclase and accumulation of jasmonates during organogenic nodule formation from hop (<EM>Humulus lupulus</EM> var. Nugget) internodes Plant Cell Physiol. 46, 1713-23, (2005)

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Publikation

Danon, A.; Miersch, O.; Felix, G.; op den Camp, R.G.L.; Apel, K. Concurrent activation of cell death-regulating signaling pathways by singlet oxygen in Arabidopsis thaliana Plant J. 41, 68-80, (2005)

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Publikation

Rudus, I.; Kepczynska, E.; Kepczynski, J.; Wasternack, C.; Miersch, O. Changes in jasmonates and 12-oxophytodienoic acid contents of <EM>Medicago sativa</EM> L. during somatic embryogenesis Acta Physiol. Plantar. 27, 497-504, (2005)

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Publikation

Ludwig, A.A.; Saitoh, H.; Felix, G.; Freymark, G.; Miersch, O.; Wasternack, C.; Boller, T.; Jones, J.D.G.; Romeis, T. Ethylene-mediated cross-talk between calcium-dependent protein kinase and MAPK signaling controls stress responses in plants PNAS 102, 10736-10741, (2005)

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Publikation

Maucher, H.; Stenzel, I.; Miersch, O.; Stein, N.; Prasad, M.; Zierold, U.; Schweizer, P.; Dorer, C.; Hause, B.; Wasternack, C. The allene oxide cyclase of barley (<span>Hordeum vulgare</span> L.) - cloning and organ-specific expression Phytochemistry 65, 801-811, (2004) DOI: 10.1016/j.phytochem.2004.01.009

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Publikation

Gidda, K.S.; Miersch, O.; Schmidt, J.; Wasternack, C.; Varin, L. Biochemical and molecular characterization of a hydroxy-jasmonate sulfotransferase from Arabidopsis thaliana J. Biol. Chem. 278, 17895-17900, (2003) DOI: 10.1074/jbc.M211943200

12-Hydroxyjasmonate, also known as tuberonic acid, was first isolated from Solanum tuberosum and was shown to have tuber-inducing properties. It is derived from the ubiquitously occurring jasmonic acid, an important signaling molecule mediating diverse developmental processes and plant defense responses. We report here that the gene AtST2a from Arabidopsis thaliana encodes a hydroxyjasmonate sulfotransferase. The recombinant AtST2a protein was found to exhibit strict specificity for 11- and 12-hydroxyjasmonate with Km values of 50 and 10 µM, respectively. Furthermore, 12-hydroxyjasmonate and its sulfonated derivative are shown to be naturally occurring in A. thaliana. The exogenous application of methyljasmonate to A. thaliana plants led to increased levels of both metabolites, whereas treatment with 12-hydroxyjasmonate led to increased level of 12-hydroxyjasmonate sulfate without affecting the endogenous level of jasmonic acid. AtST2a expression was found to be induced following treatment with methyljasmonate and 12-hydroxyjasmonate. In contrast, the expression of the methyljasmonate-responsive gene Thi2.1, a marker gene in plant defense responses, is not induced upon treatment with 12-hydroxyjasmonate indicating the existence of independent signaling pathways responding to jasmonic acid and 12-hydroxyjasmonic acid. Taken together, the results suggest that the hydroxylation and sulfonation reactions might be components of a pathway that inactivates excess jasmonic acid in plants. Alternatively, the function of AtST2a might be to control the biological activity of 12-hydroxyjasmonic acid.
Publikation

Färber, K.; Schumann, B.; Miersch, O.; Roos, W. Selective desensitization of jasmonate- and pH-dependent signaling in the induction of benzophenanthridine biosynthesis in cells of Eschscholzia californica Phytochemistry 62, 491-500, (2003)

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