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Plant Physiology and Photobiology


  • Plant Physiology
    (Bianka Steffens)
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Plant Physiology and Photobiology

Prof. Dr. Paul Galland

Scientific focus

The perception of light and the earth's gravitational field represent crucial factors for growth and morphogenesis. We investigate the gravi- and photoperception of fungi and plants and are particularly interested in the respective primary responses and the role of the cytoskeleton. To tackle these problems we employ a spectrum of methods that are characteristic for approa-ches in physiology, spectroscopy and cell biology. Our major goal is the identification and characterization of the gravisusceptors and photoreceptors and their interaction with the cytoskeleton. In this context we also investigate basic questions pertaining to the role of the cytoskeleton in the transport and positioning of plant and fungal organelles. Particularly in large and polar growing cells, organelles are frequently characterized by non-random intracellular distributions and directional transport. This feat is achieved by the cytoskeleton, a dynamic system of filamentous protein polymers equipped with motor proteins that mediate the transport of cargo, e.g. organelles.

We employ the following organisms for comparative investigations: Phycomyces blakesleeanus (a unicellular Zygomycete fungus), Arabidopsis thaliana (a crucifer), Avena sativa (oat), and the green algae, Chara, Spirogyra and Mougeotia)(Charophyceae).

Contact

Prof. Dr. Paul Galland
Phone: ++49 6421 28 22061
Fax: ++49 6421 28 22057
galland@staff.uni-marburg.de

Dr. Franz Grolig
Phone: ++49 6421 28 23556
grolig@staff.uni-marburg.de

Dr. Hartwig Schuchart
Phone: ++49 6421 28 2067
schuchar@staff.uni-marburg.de


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Molecular Plant Physiology and Photobiology

Prof. Dr. Alfred Batschauer

Scientific focus

We investigate with various methods members of the photolyase/cryptochrome family from Arabidopsis thaliana.

Photolyases are DNA-repair enzymes, which repair mutagenic and cytotoxic DNA-lesions caused by UV-B. For repair they use light energy in the UV-A/blue region. Our research focuses on the enlightenment of the catalytic mechanism of DNA-photolyase in metazoans.

Cryptochromes are blue-light receptors closely related to photolyases, and were identified in bacteria, plants, animals and human. We investigate two plant cryptochromes, CRY2 and CRY3. CRY2 is a nuclear photoreceptor that plays an essential role in the regulation of flowering time. CRY3 is localised in organelles (chloroplasts, mitochondria) and binds DNA. Our research on cryptochromes focuses on biochemical, spectroscopic and structural aspects to understand their function at the molecular and atomic level.

Contact

Prof. Dr. Alfred Batschauer
Phone: ++49 6421 28 27064
Fax: ++49 6421 28 21545
batschau@staff.uni-marburg.de

PD Dr. Dieter Dörnemann
Phone: ++49 6421 28 22070
doernema@staff.uni-marburg.de


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Plant Physiology

PD Dr. Bianka Steffens

Scientific focus

We investigate the perception of the plant hormone auxin and the auxin signaling pathway using molecular, biochemical, cell biological and physiological methods. Auxin binding protein 1 (ABP1) is an extracellular auxin receptor for fast responses and is located at the plasma membrane. We developed a single cell method to analyze ABP1 and other components of the auxin signaling pathway. Protoplast swelling of cells of maize coleoptiles, Arabidopsis and tomato hypocotyls is mediated by ABP1. Auxin also mediates elongation growth of coleoptiles and hypocotyls. Expression analyses using ABP1 promoter GUS lines reveal specific expression pattern during development of Arabidopsis. Auxin, other plant hormones, abiotic and biotic stresses alter the expression patterns of ABP1. One aim of our work is to disentangle the auxin signaling pathway that starts with binding to ABP1 and ends up with protoplast swelling and growth.

Contact

PD Dr. Bianka Steffens
Phone: ++49 6421 28 26571
bianka.steffens@biologie.uni-marburg.de

Last modified: 18.09.2014 · hansteic

 
 
 
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