Co-introduction of exotic rhizobia to the rhizosphere of the invasive legume Acacia saligna, an intercontinental study

作者: João Apolinário Crisóstomo , Susana Rodríguez-Echeverría , Helena Freitas

DOI: 10.1016/J.APSOIL.2012.10.005

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摘要: Abstract Invasive woody legumes have profound impacts in the nitrogen content and cycling of invaded ecosystems due to ability enter into symbiosis with nitrogen-fixing bacteria. In spite relevance this symbiosis, identity origin symbionts involved invasion are not well understood. We conducted a study assess diversity symbiotic root-nodulating bacteria associated invasive Acacia saligna, newly colonized areas Portugal Australia. BOX-PCR was used discriminate isolated 16S rRNA nifD genes were sequenced identify different isolates their geographic origin. Bradyrhizobium Mesorhizobium nodulated A. saligna Australia while only spp. found Portugal. The dominant strains nodulating related liaoningense canariense. Co-occurring longifolia harbor rhizobial communities. As an example, we sp. Phyllobacterium trifolii respectively, being first report for association. analysis phylogeographic marker clustered most sequences obtained Australian origin, indicating that exotic bradyrhizobia might been co-introduced This result highlights risks introducing inoculants facilitate new alter native soil bacterial communities, hindering recovery ecosystems.

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