Relative efficiency,ureide transport and harvest index in soybeans inoculated with isogenic HUP mutants of Bradyrhizobium japonicum |
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Authors: | M Hungria M C P Neves J Döbereiner |
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Institution: | (1) EMBRAPA-UAPNPBS, Seropédica, 23851 Rio de Janeiro, Brasil |
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Abstract: | Summary Differences between isogenic uptake hydrogenase (HUP) mutants of Bradyrhizobium japonicum in terms of nodule efficiency, N2 fixation and N incorporation into various plant parts were studied in a monoxenic greenhouse experiment in order to confirm previous results with soybeans and beans inoculated with various HUP+ and HUP– strains. The HUP+ revertant PJ17-1 of a HUP– mutant (PJ17) of strain USDA DES 122 showed a completely restored relative efficiency (100% versus 78±2% for the HUP– mutant), higher nodule efficiency (N2 fixed per g nodules), higher ureide-N transport rates, higher N contents in pods and higher N harvest indices. All these observations confirm previous experiments with HUP+ and HUP– strains. |
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Keywords: | N2 fixation Soybeans Bradyrhizobium japonicum HUP mutants N transport Ureide Acetylene reduction assay (ARA) |
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