59 Result(s)

Article

Streptomyces AcH 505 triggers production of a salicylic acid analogue in the fungal pathogen Heterobasidion abietinum that enhances infection of Norway spruce seedlings

The necrotrophic fungus Heterobasidion spp. is the causal agent of ‘annosum root rot’ of Norway spruce. In the presence of the rhizosphere bacterium Streptomyces AcH 505, enhanced colonization of Norway spruce ro...

Nadine Keilhofer, Jonny Nachtigall, Andreas Kulik, Margret Ecke… in Antonie van Leeuwenhoek (2018)

Chapter

Interaction of Gravity with Cellular Compounds

During evolution, the majority of organisms have developed specific sensors for gravity, the only constant environmental cue on earth. Nevertheless, a variety of gravity effects on molecular, cellular, and phy...

Wolfgang Hanke, Florian P. M. Kohn, Maren Neef, Rüdiger Hampp in Gravitational Biology II (2018)

Chapter

Interaction of Gravity with Cell Metabolism

Plants orient their organs, explore, and adapt to their environment mainly by sensing light and the direction of gravity. Some theories exist about gravity sensing including as a starting point the presence of...

Wolfgang Hanke, Florian P. M. Kohn, Maren Neef, Rüdiger Hampp in Gravitational Biology II (2018)

Article

Intracellular Calcium Decreases Upon Hyper Gravity-Treatment of Arabidopsis Thaliana Cell Cultures

Cell cultures of Arabidopsis thaliana (A.t.) respond to changes in the gravitational field strength with fluctuations of the amount of cytosolic calcium (Ca²⁺). In parabolic flight experiments, where hyper- and μ

Maren Neef, Tamara Denn, Margret Ecke, Rüdiger Hampp in Microgravity Science and Technology (2016)

Article

Changes in Gene Expression of Arabidopsis Thaliana Cell Cultures Upon Exposure to Real and Simulated Partial-g Forces

Cell cultures of the plant model organism Arabidopsis thaliana were exposed to partial-g forces during parabolic flight and clinostat experiments (0.16 g, 0.38 g and 0.5 g were tested). In order to investigate gr...

Svenja Fengler, Ina Spirer, Maren Neef, Margret Ecke… in Microgravity Science and Technology (2016)

Article

Real-time Recording of Cytosolic Calcium Levels in Arabidopsis thaliana Cell Cultures during Parabolic Flights

In plants, like in other organisms, calcium (Ca²⁺) is an important second messenger which participates in the conversion of environmental signals into molecular responses. There is increasing evidence, that sensi...

Maren Neef, Margret Ecke, Rüdiger Hampp in Microgravity Science and Technology (2015)

Article

Biotransformation of the Fungal Phytotoxin Fomannoxin by Soil Streptomycetes

Rhizosphere-associated Streptomyces sp. AcH 505 (AcH 505) promotes infection of Norway spruce (Picea abies) with the pathogenic fungus Heterobasidion abietinum 331, while Streptomyces sp. GB 4–2 (GB 4–2) enhances...

Nadine Horlacher, Jonny Nachtigall, Dirk Schulz… in Journal of Chemical Ecology (2013)

Article

Carbon allocation in ectomycorrhizal plants at limited and optimal N supply: an attempt at unraveling conflicting theories

With regard to mycorrhiza, conflicting theories try to explain how the balance between fungal demand for carbohydrates and the plant’s needs for nutrients varies, resulting in conflicting predictions. In order...

Ana Corrêa, Rüdiger Hampp, Elisabeth Magel, Maria-Amélia Martins-Loução in Mycorrhiza (2011)

Chapter

Areas of Research

This chapter introduces the main topics of research that have benefited so far from the space environment (reduced gravity, ambient radiation, vacuum, etc.), and provides an outlook for future research develop...

Jessica Aceto, Joan Albiol, Audrey Berthier… in Laboratory Science with Space Data (2011)

Article

WS-5995 B, an antifungal agent inducing differential gene expression in the conifer pathogen Heterobasidion annosum but not in Heterobasidion abietinum

The mycorrhization helper bacterium Streptomyces sp. AcH 505 inhibits Norway spruce root infection and colonisation by the root and butt rot fungus Heterobasidion annosum 005 but not by the congeneric strain Hete...

Nina A. Lehr, Aleksandra Adomas… in Applied Microbiology and Biotechnology (2009)

Article

Alterations in Protein Expression of Arabidopsis thaliana Cell Cultures During Hyper- and Simulated Micro-Gravity

Callus cell cultures of Arabidopsis thaliana exposed to hypergravity (8×g), 2D clinorotation and random positioning exhibit changes in gene expression (Martzivanou et al., Protoplasma 229:155–162, 2006). In a rec...

Žarko Barjaktarović, Maren Babbick, Alfred Nordheim… in Microgravity Science and Technology (2009)

Chapter

Plant Associated Soil Micro-organisms

Roots constitute important plant organs for water and nutrient uptake. However, they also release a wide range of carbon compounds of low molecular weight. These can amount to between 10% and 20% of total net ...

Mika Tarkka, Silvia Schrey, Rüdiger Hampp in Molecular Mechanisms of Plant and Microbe … (2008)

Chapter

Secondary Metabolites of Soil Streptomycetes in Biotic Interactions

Streptomyces spp. are ubiquitous in soil microbial communities, and more than 500 species have been described thus far. The streptomycetes are generally saprophytic organisms which spend ...

Mika Tarkka, Rüdiger Hampp in Secondary Metabolites in Soil Ecology (2008)

Article

Interaction with mycorrhiza helper bacterium Streptomyces sp. AcH 505 modifies organisation of actin cytoskeleton in the ectomycorrhizal fungus Amanita muscaria (fly agaric)

The actin cytoskeleton (AC) of fungal hyphae is a major determinant of hyphal shape and morphogenesis, implicated in controlling tip structure and secretory vesicle delivery. Hyphal growth of the ectomycorrhiz...

Silvia D. Schrey, Vanamo Salo, Marjatta Raudaskoski, Rüdiger Hampp… in Current Genetics (2007)

Chapter

Mycorrhiza of Clusia Species: Types, Abundance, Responses to Environmental Conditions

Mycorrhiza is formed by more than 90 % of terrestrial plants between their roots and soil fungi (Molina et al. 1992). It is commonly accepted that mycorrhizal associations are beneficial for both partners in that...

Meike Kreuzer, Anja Vaasen, Fabio Rubio Scarano, Rüdiger Hampp in Clusia (2007)

Chapter

Population Biology of Different Clusia Species in the State of Rio de Janeiro

“Simple-Sequence-Repeats” (SSR) or “Microsatellites” are repeats of short sequence motifs with a length of 1 to 6 bp, which can be replicated up to 100 times (Tautz 1993) and occur in the non-coding regions of eu...

Anja Vaasen, Fabio Rubio Scarano, Rüdiger Hampp in Clusia (2007)

Chapter

Investigation of Horizontal Gene Transfer from Transgenic Aspen to Ectomycorrhizal Fungi

Uwe Nehls, Chi Zhang, Mika Tarkka, Rüdiger Hampp, Dr. Matthias Fladung in Tree Transgenesis (2006)