Ectomycorrhiza formation and willow growth promotion as affected by associated bacteria: role of microbial metabolites and use of C sources |
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Authors: | Katarzyna Hrynkiewicz Agnieszka Ciesielska Ingeborg Haug Christel Baum |
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Institution: | 1. Department of Microbiology, N. Copernicus University, ul. Gagarina 9, PL-89-100, Torun, Poland 2. Institute of Land Use, University of Rostock, Justus-von-Liebig-Weg 6, 18059, Rostock, Germany 3. Eberhard-Karls-University Tübingen, Botanical Institute, Systematic Botany and Mycology, Auf der Morgenstelle 1, 72076, Tübingen, Germany
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Abstract: | Biotic interactions affect the impact of potential plant growth promoting microorganisms in the rhizosphere, but their magnitude
and fundamentals are often hardly known. In a pot experiment, two physiologically different strains of the ectomycorrhizal
fungus Paxillus involutus (GUL and FRA) were tested separately and in combination with associated bacteria (Sphingomonas paucimobilis 1 L, Ralstonia pickettii 16 B, Sphingomonas sp. 23 L) on their effects on the growth of willows (Salix viminalis). Both P. involutus strains significantly increased the growth of the willows compared with non-inoculated plants, but the magnitude of this
effect was significantly affected by the fungal strain. The P. involutus strain GUL with higher synthesis of auxin-like substances, acid phosphatases, siderophores and faster utilisation of yeast
extract in vitro increased the willow growth in situ more effectively than strain FRA. Additionally, dual inoculation with
the P. involutus strains GUL and FRA in combination with the associated bacteria promoted the willow growth, especially the combination with
S. paucimobilis 1 L. This bacterial strain used effectively C sources which are common components of plant root exudates, e.g. glucose, sucrose,
maltose and mannose as well as compounds synthesized by fungi, e.g. trehalose in vitro. We conclude that the analyses of fungal
metabolites and of C source use of associated bacteria can successfully contribute to accelerate the selection of capable
plant growth promoting combinations. |
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