Nodulation pattern and acetylene reduction (nitrogen fixation) activity of some highland and lowland Acacia species of Ethiopia |
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Authors: | F Assefa D Kleiner |
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Institution: | (1) Microbiology Department, University of Bayreuth, D-95440 Bayreuth, Germany Fax: +49-921-552727, e-mail: diethelm.kleiner@uni-bayreuth.de, DE |
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Abstract: | Endosymbionts from the Ethiopian highland acacia species Acacia abyssinica, A. negrii and A. etbaica, and the lowland species A. nilotica, A. prasinata, A.senegal, A. seyal, A. tortilis and Faidherbia (Acacia) albida were isolated and characterized. Seven tree species were found to be nodulated by species of both Rhizobium and Bradyrhizobium. F. (Acacia) albida and A. senegal were nodulated by only Bradyrhizobium or Rhizobium, respectively. In A. abyssinica, both genera were isolated from the same nodule, whereas in A. nilotica and A. tortilis, both strains were isolated from different nodules of the same plant. The nitrogen fixation (acetylene reduction) activities
varied considerably and showed no correlation with the nitrogen content of the plant. Highland species were as effective as
lowland plants, thus demonstrating good potential for soil reclamation. The endosymbionts isolated proved rather promiscuous,
efficiently nodulating other Acacia spp. and some tropical grain legumes, but did not nodulate temperate legumes.
Received: 7 August 1997 |
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Keywords: | Acacia spp Bradyrhizobium Rhizobium Nitrogen fixation Nitrogen accumulation |
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