Jack-of-all-trades and master of many? How does associated rhizobial diversity influence the colonization success of Australian Acacia species?

摘要: Aim  To evaluate the role of rhizobial diversity, and symbiotic promiscuity, on invasive ability Australian acacias (Acacia species in subgenus Phyllodineae native to Australia). Location  Global. Methods  A bibliographic review diversity associated with Acacia was performed assess promiscuity for non-invasive species. The dealbata A. saligna Australia Portugal A. pycnantha South Africa assessed by 16S rDNA intergenic spacer sequencing bacteria isolated from field-collected nodules. Results  All studied are nodulated strains genus Bradyrhizobium, which appears be dominant group acacia symbionts non-native soils. Both literature experimental data this study suggest that bradyrhizobia might have been co-introduced new geographical regions. can also harbour other root-nodulating alpha betaproteobacteria genera, although these less abundant than Bradyrhizobium. Main conclusions  There is no clear difference acacias. nodulate both regions, harbouring predominantly Bradyrhizobium but showing some degree promiscuity. co-introduction compatible explain establishment populations, novel associations rhizobia invaded soils possible. Invasive legumes use strategies low would become only if progress invasion impacts ecosystems differ depending nodulation strategy.