Frankia in the rhizosphere of nonhost plants: A comparison with root-associated N2-fixing Enterobacter,Klebsiella and Pseudomonas |
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Authors: | R Rönkkö A Smolander E -L Nurmiaho-Lassila K Haahtela |
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Institution: | (1) Department of General Microbiology, University of Helsinki, P.O. Box 41, SF-00014 Helsingin yliopisto, Finland;(2) Department of Electron Microscopy, University of Helsinki, P.O. Box 41, SF-00014 Helsingin yliopisto, Finland;(3) Department of Forest Ecology, Finnish Forest Research Institute, P.O. Box 18, SF-01301 Vantaa, Finland |
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Abstract: | Bacterial growth in the rhizosphere and resulting changes in plant growth parameters were studied in small aseptic seedlings
of birch (Betula pendula and B. pubescens) and grasses (Poa pratensis and Festuca rubra). The seedlings were inoculated with three Frankia strains (Ai1a and Ag5b isolated from native Alnus root nodules and Ai17 from a root nodule induced by soil originating from a Betula pendula stand), and three associative N2-fixing bacteria (Enterobacter agglomerans, Klebsiella pneumoniae and Pseudomonas sp., isolated from grass roots). Microscopic observations showed that all the Frankia strains were able to colonize and grow on the root surface of the plants tested without addition of an exogenous carbon source.
No net growth of the associative N2-fixers was observed in the rhizosphere, although inoculum viable counts were maintained over the experimental period. Changes
in both the biomass and morphology of plant seedlings in response to bacterial inoculation were recorded, which were more
dependent on the plant species than on the bacterial strain. |
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Keywords: | Actinorhiza Betula pendula Betula pubescens birch Enterobacter agglomerans Festuca rubra Frankia Klebsiella pneumoniae nitrogen fixation Poa pratensis Pseudomonas sp rhizosphere root |
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