Effects of root-associated N2-fixing cyanobacteria on the growth and nitrogen content of wheat (Triticum vulgare L.) seedlings |
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Authors: | Zorica Obreht Nigel W Kerby Miroslav Gantar Peter Rowell |
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Institution: | (1) Institute of Biology, University of Novi Sad, 2100 Novi Sad, Yugoslavia;(2) Department of Biological Sciences, The University of Dundee, DD1 4HN Dundee, UK |
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Abstract: | Summary Following co-cultivation of wheat with N2-fixing cyanobacterial isolates capable of forming associations, Nostoc 2S6B, 2S9B or Anabaena C5, for 15 days in the presence or absence of combined N a large stimulation of root length was observed without any increase in root dry weight. Increases in the N concentrations of both roots and shoots occurred following co-cultivation with most cyanobacteria tested. The increase in plant N concentrations appeared to be dependent on the wheat cultivar and the cyanobacterial isolate used. Nostoc isolates had similar nitrogenase activities when associated with roots and when grown in shake-flask cultures. The nitrogenase activity of roots colonized by Anabaena C5 or Nostoc 2S6B was higher following removal of loosely associated cyanobacteria. |
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Keywords: | Anabaena Cyanobacteria Nitrogenase activity (acetylene reduction assay) Nostoc Symbiosis Triticum vulgare Wheat |
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