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HERO ID
3112443
Reference Type
Journal Article
Title
Ectomycorrhiza formation and willow growth promotion as affected by associated bacteria: role of microbial metabolites and use of C sources
Author(s)
Hrynkiewicz, K; Ciesielska, A; Haug, I; Baum, C
Year
2010
Is Peer Reviewed?
Yes
Journal
Biology and Fertility of Soils
ISSN:
0178-2762
EISSN:
1432-0789
Volume
46
Issue
2
Page Numbers
139-150
DOI
10.1007/s00374-009-0419-2
Web of Science Id
WOS:000273555100006
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.
Keywords
Paxillus involutus; Helper bacteria; IAA; Acid phosphatase; Siderophores; BIOLOG
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