Nitrogen-fixing potential of Acacia mangium and Acacia auriculiformis seedlings inoculated with Bradyrhizobium and Rhizobium spp. |
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| Authors: | Galiana A Chaumont J Diem H G Dommergues Y R |
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| Institution: | (1) Biotechnologie des Systèmes Symbiotiques Forestiers Tropicaux (CTFT/ORSTOM/CNRS), 45 bis Avenue de la Belle Gabrielle, F-94736 Nogent sur Marne Cedex, France |
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| Abstract: | Summary Two Australian Acacia species, A. mangium and A. auriculiformis were inoculated in vitro with eight strains of Bradyrhizobium spp. and two strains of Rhizobium spp. On the two plant species, only Bradyrhizobium spp. strains formed effective N2-fixing nodules. A. mangium, which nodulates effectively with a restricted range of Bradyrhizobium spp. strains, is a specific host compared to A. auriculiformis. A. auriculiformis is assumed to be a promiscuous host because it nodulates effectively with a wide range of Bradyrhizobium spp. strains. Nodule efficiency as expressed by the ratio of N2 fixed to nodule dry weight appeared to be higher in A. auriculiformis (0.44–0.81) than in A. mangium (0.23–0.55). |
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| Keywords: | Acacia mangium Acacia auriculiformis Bradyrhizobium spp Rhizobium spp Nitrogen fixation Nodule efficiency Tree legumes Agroforestry |
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