Photodynamic oxygen activation by rubellin D,a phytotoxin produced by Ramularia collo-cygni (Sutton et Waller) |
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| Affiliation: | 1. Institute of Phytopathology, Life Science Center Weihenstephan, Technical University of Munich, Am Hochanger 2, Freising-Weihenstephan D-85350, Germany;2. Federal Biological Research Center for Agriculture and Forestry, Stahnsdorfer Damm 81, Kleinmachnow D-14532, Germany;3. Institute of Pharmacy, University of Jena, Neugasse 23, Jena D-07743, Germany;1. Institute of Plant Genetics, Breeding and Biotechnology, University of Life Sciences, Lublin, Poland;2. The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, The Hebrew University of Jerusalem, Israel;1. Laboratory of Physics of Surfaces and Interfaces, LPSI, University of Mons, Place du Parc 23, B-7000 Mons, Belgium;2. Laboratory of Organic Chemistry, University of Mons, Av Maistriau, B-7000 Mons, Belgium |
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| Abstract: | Ramularia collo-cygni, a pathogenic deuteromycete, is the causal agent of Ramularia leaf spot disease on barley. It produces a number of coloured metabolites of which one was identified as rubellin D, a phytotoxin only described for Mycosphaerella rubella until now. Rubellin D induces light- and concentration-dependent necrosis on barley leaves. In a biochemical model system we could demonstrate that rubellin D exhibits photodynamic activity triggering the light-dependent production of reactive oxygen species (ROS). The use of inhibitors of ROS production confirmed mainly the production of singlet oxygen and to a lesser extent superoxide. In addition, light-dependent peroxidation of α-linolenic acid by rubellin D was shown. Based on our results we present a model for ROS-mediated symptom induction on barley leaves by Ramularia collo-cygni. |
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