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Publikationen - Molekulare Signalverarbeitung

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Publikation

Wasternack, C. & Hause, B. Jasmonsäure – ein universelles Pflanzenhormon: Blütenduft, Abwehr, Entwicklung Biologie in unserer Zeit 44, 164 - 171, (2014) DOI: 10.1002/biuz.201410535

Jasmonsäure (JA) und ihre Metaboliten kommen in allen niederen und höheren Pflanzen vor. Sie sind universell wirksame, aus Lipiden gebildete Signalstoffe bei der Abwehr von biotischem und abiotischem Stress sowie in der pflanzlichen Entwicklung. Rezeptor und Komponenten von JA–Signalketten wurden identifiziert. In der Entwicklung von Blüten, Früchten, Samen, Trichomen oder in der Abwehr von Insekten und Pathogenen treten ähnliche JA-vermittelte Signalproteine auf, die eine Feinregulation der Prozesse erlauben und eine Verbindung (cross-talk) zu anderenPflanzenhormonen aufweisen.

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.

Publikation

Wasternack, C. & Hause, B. Jasmonates: biosynthesis, perception, signal transduction and action in plant stress response, growth and development. An update to the 2007 review in Annals of Botany Annals of Botany 111, 1021-1058, (2013) DOI: 10.1093/aob/mct067

Background: Jasmonates are important regulators in plant responses to biotic and abiotic stresses as well as in

development. Synthesized from lipid-constituents, the initially formed jasmonic acid is converted to different

metabolites including the conjugate with isoleucine. Important new components of jasmonate signalling including

its receptor were identified, providing deeper insight into the role of jasmonate signalling pathways in stress

responses and development.

Scope: The present review is an update of the review on jasmonates published in this journal in 2007. New data

of the last five years are described with emphasis on metabolites of jasmonates, on jasmonate perception and

signalling, on cross-talk to other plant hormones and on jasmonate signalling in response to herbivores and pathogens,

in symbiotic interactions, in flower development, in root growth and in light perception.

Conclusions: The last few years have seen breakthroughs in the identification of JASMONATE ZIM DOMAIN

(JAZ) proteins and their interactors such as transcription factors and co-repressors, and the crystallization of the

jasmonate receptor as well as of the enzyme conjugating jasmonate to amino acids. Now, the complex nature of

networks of jasmonate signalling in stress responses and development including hormone cross-talk can beaddressed.

Publikation

Goetz, S., Hellwege, A., Stenzel, I., Kutter, C., Hauptmann, V., Forner, S., Mc Caig, B., Hause, G., Miersch, O., Wasternack, C. & Hause, B. Role of cis-12-oxo-phytodienoic acid in tomato embryo development. Plant Physiol 158 (4), 1715-1727, (2012)

Oxylipins including jasmonates are signaling compounds in plant growth, development, and responses to biotic and abiotic stresses. In Arabidopsis (Arabidopsis thaliana) most mutants affected in jasmonic acid (JA) biosynthesis and signaling are male sterile, whereas the JA-insensitive tomato (Solanum lycopersicum) mutant jai1 is female sterile. The diminished seed formation in jai1 together with the ovule-specific accumulation of the JA biosynthesis enzyme allene oxide cyclase (AOC), which correlates with elevated levels of JAs, suggest a role of oxylipins in tomato flower/seed development. Here, we show that 35S::SlAOC-RNAi lines with strongly reduced AOC in ovules exhibited reduced seed set similarly to the jai1 plants. Investigation of embryo development of wild-type tomato plants showed preferential occurrence of AOC promoter activity and AOC protein accumulation in the developing seed coat and the embryo, whereas 12-oxo-phytodienoic acid (OPDA) was the dominant oxylipin occurring nearly exclusively in the seed coat tissues. The OPDA- and JA-deficient mutant spr2 was delayed in embryo development and showed an increased programmed cell death in the developing seed coat and endosperm. In contrast, the mutant acx1a, which accumulates preferentially OPDA and residual amount of JA, developed embryos similar to the wild type, suggesting a role of OPDA in embryo development. Activity of the residual amount of JA in the acx1a mutant is highly improbable since the known reproductive phenotype of the JA-insensitive mutant jai1 could be rescued by wound-induced formation of OPDA. These data suggest a role of OPDA or an OPDA-related compound for proper embryo development possibly by regulating carbohydrate supply and detoxification.

Publikation

Wasternack, C., Goetz, S., Hellwege, A., Forner, S., Strnad, M. & Hause, B. Another JA/COI1-independent role of OPDA detected in tomato embryo development Plant Signal Behav 7(10), 1349-1353, (2012)

Jasmonates (JAs) are ubiquitously occurring signaling compounds in plants formed in response to biotic and abiotic stress as well as in development. (+)-7-iso-jasmonoyl isoleucine, the bioactive JA, is involved in most JA-dependent processes mediated by the F-box protein COI1 in a proteasome-dependent manner. However, there is an increasing number of examples, where the precursor of JA biosynthesis, cis-(+)-12-oxophytodienoic acid (OPDA) is active in a JA/COI1-independent manner. Here, we discuss those OPDA-dependent processes, thereby giving emphasis on tomato embryo development. Recent data on seed coat-generated OPDA and its role in embryo development is discussed based on biochemical and genetic evidences.

Publikation

Hause, B., Wasternack, C. & Strack, D. Jasmonates in stress responses and development Phytochemistry 70, 1483 - 1484, (2009)

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Publikation

Wasternack, C. & Hause, B. Emerging complexity: jasmonate-induced volatiles affect parasitoid choice J Exp Bot 60, 2451-2453, (2009)

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Bücher und Buchkapitel

Dorka, R., Miersch, O., Hause, B., Weik, P. & Wasternack, C. Chronobiologische Phänomene und Jasmonatgehalt bei Viscum album L.. In: Die Mistel in der Tumortherapie 2 (Scheer, R.; Bauer, R.; Bekker, A.; Berg, P. A.; Fintelmann, V.). KVC-Verlag Essen 49-56, (2009) ISBN: 978-3-933351-82

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Publikationen in Druck

Floss, D.S., Hause, B., Lange, P.R., Küster, H., Strack, D. & Walter, M.H. Knock-down of the MEP pathway isogene 1-deoxy-d-xylulose 5-phosphate synthase 2 inhibits formation of arbuscular mycorrhiza-induced apocarotenoids, and abolishes normal expression of mycorrhiza-specific plant marker genes Plant J. 56 (1), 86-100, (2008)

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Publikation

Stenzel, I., Hause, B., Proels, R., Miersch, O., Oka, M., Roitsch, T. & Wasternack, C. The AOC promoter of tomato is regulated by developmental and environmental stimuli Phytochemistry 69, 1859-1869, (2008)

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