14 documents found

Dissertation
CC BY 4.0
2019

Inter-kingdom communication in the marine environment : bacterial modulation o ...

Mikroalgen, und insbesondere Kieselalgen, spielen eine grundlegende ökologische Rolle und haben ein breites Feld von industriellen und technologischen Anwendungen. In den letzten Jahren hat sich die Forschung in der chemischen Ökologie und Biotechnologie auf molekulare Mechanismen, die die Wechselwirkung...
Dissertation
All rights reserved
2017

The role of cryptochromes in the sexual life cycle of Chlamydomonas reinhardtii

Cryptochromes are known as blue light sensory flavoproteins in plants, insects, fungi, and bacteria and as part of the circadian oscillator, the latter mainly in mammals. An animal-like cryptochrome (aCRY) from Chlamydomonas reinhardtii was recently characterized as a blue and red light photoreceptor...
Dissertation
CC BY 3.0
2017

Phyto-hormonal regulation of local and systemic defense and photosynthetic-responses...

Evolution led to the development of mechanisms for the recognition of herbivores in plants (the doors of perception). These mechanisms by themselves induce changes in plants that allows them to respond adequately to the threat by the herbivore. These changes not only include mechanisms of defense, but...
Dissertation
2015-08-21

The role of cytokinins in plant-herbivore interactions : response to herbivory ...

Cytokinins (CK) are a group of phytohormones that are well-known to regulate the plant development, but also environmental interactions. The most prominent examples for CK functions in plant-insect interactions are the leaf miner and sawfly induced formation of “green islands” and leaf galls, respectively....
Dissertation
2014-07-11

Metabolic investigation of the microalga Emiliania huxleyi in laboratory...

The coccolithophore Emiliania huxleyi constitutes a key player of global carbon cycling and its massive algal blooms are frequently terminated by viruses. Thus, the alga is an attractive target for investigations in the context of its ecological role or mechanisms of viral infection, which I addressed...
Dissertation
2014-06-05

Die funktionelle Charakterisierung des Augenfleckproteins SOUL3 in Chlamydomonas...

Die Familie der SOUL/HBPs sind Häm-bindende Proteine, über deren biologische Funktion relativ wenig bekannt ist. Sie kommen z. Bsp. in Cyanobakterien, Pflanzen und Wirbeltieren vor. In der Grünalge Chlamydomonas reinhardtii war im Proteom des Augenflecks, einem primitiven visuellen System, das Protein...
Dissertation
2014-05-09

Timing for outcrossing : circadian clock regulates floral rhythms with large f ...

Like most organisms, plants need to keep a daily rhythm to synchronize their inner functions to the available energy and nutrients; even due to its sessile nature it’s especially important for a large group to find ways to reproduce by outcrossing. The endogenous clock regulates metabolic processes related...
Dissertation
2009-01-13

The Function of the RNA-Binding Protein CHLAMY1 in the Circadian Clock...

The research of this thesis focused on the circadian RNA-binding protein CHLAMY1 from the green alga Chlamydomonas reinhardtii that consists of two subunits, C1 and C3. CHLAMY1 binds specifically to (UG)≥7-repeat sequences situated in the 3'-UTRs of several mRNAs such as nitrite reductase 1 (nii1). The...
Dissertation
All rights reserved
2007-11

Qualitative and quantitative analyses of the composition and dynamics of...

The photosynthetic apparatus of eukaryotic organisms posseses a remarkable ability to adapt to ever changing light conditions and other environmental cues. In the present study, the compositon of plant light harvesting complex I (LHCI), its association with photosystem I (PSI) and its dynamic changes...
Dissertation
2007-03-29

Molekulare und physiologische Analyse redoxregulierter Lichtakklimations-Antworten...

Arabidepsis thaliana zeigt Kurz- (STR) und Langzeitakklimation (LTR) des Photosyntheseapparates nach Veränderungen der Lichtqualität. Die STR beeinflusst bereits vorhandene Komponenten des photosynthetischen Apparates, während über die LTR eine gezielte Verschiebung der Photosystemstöchiometrie erfolgt....
Dissertation
All rights reserved
2007

Comparing induced responses of medicago truncatula to biotic challenges

In der vorliegenden Arbeit wurden die Antworten von Medicago truncatula Gaertner (gestutzter Schneckenklee, Fabaceae) auf verschiedene biotische Reize verglichen. Dabei wurden Reaktionen auf verschiedene Fraßfeinde und mikrobielle Oligosaccharide analysiert. Des Weiteren wurden der Einfluß von Mykorrhizierung...
Dissertation
2006-07-13

Untersuchungen zur Lipoxygenase-vermittelten chemischen Verteidigung

Chemische Verteidigungsstrategien der Diatomeen (Kieselalgen) werden als neuer Aspekt der Diatomeen/Kopepoden-Interaktion diskutiert, da eine diatomeenreiche maternale Ernährung die Embyrogenese von Kopepoden inhibieren kann. Nach Zellverletzung bilden Diatomeen aus C20-/C16-Polyenfettsäuren Lipoxygenase-vermittelt...
Dissertation
2005-04-28

Mediation of photosynthetic redox signals in the regulation of plant gene...

The presented work contributes novel aspects to the understanding of function and co-action of cellular signalling networks in higher plants in the course of acclimation to a changing light environment. The results show that redox signals generated in the photosynthetic electron transport chain have...