Abstract
Parasponia remains the only non-legume known to nodulate withRhizobium/Bradyrhizobium. It is a pioneer plant that is capable of rapid growth and fixing large quantities of nitrogen. In addition to its high agronomic potential, the symbiosis offers the scientist the unique opportunity of studying differences at the molecular level of both partners, and to investigate any possible extension of the symbiosis to other non-legumes of importance. Haemoglobin has been found in the nodule tissue ofParasponia and other nodulated non-legumes and the gene for it has been found and expressed in non-nodulating plants such asTrema tomentosa andCeltis australis. Bradyrhizobium strains isolated from species ofParasponia growing in Papua New Guinea form a group that are more specific in their host requirements thanBradyrhizobium strains from tropical legumes from the same area. They do not effectively nodulate (except CP283) tropical legumes, andParasponia is not readily nodulated withRhizobium andBradyrhizobium strains from legumes. The effectiveness of the symbiosis is influenced by host species, theBradyrhizobium strain and the environment.Parasponia andersonii forms a more effective symbiosis than the other species tested. In competition studies with strains from legumes, isolates fromParasponia always dominate in nodules onParasponia.
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Trinick, M.J., Hadobas, P.A. Biology of theParasponia-Bradyrhizobium symbiosis. Plant Soil 110, 177–185 (1988). https://doi.org/10.1007/BF02226797
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DOI: https://doi.org/10.1007/BF02226797