Nitrogen-fixing bacterial communities in invasive legume nodules and associated soils are similar across introduced and native range populations in Australia

Article


Birnbaum, Christina, Bissett, Andrew, Thrall, Peter H. and Leishman, Michelle R.. 2016. "Nitrogen-fixing bacterial communities in invasive legume nodules and associated soils are similar across introduced and native range populations in Australia ." Journal of Biogeography. 43 (8), pp. 1631-1644. https://doi.org/10.1111/jbi.12752
Article Title

Nitrogen-fixing bacterial communities in invasive legume nodules and associated soils are similar across introduced and native range populations in Australia

ERA Journal ID3269
Article CategoryArticle
AuthorsBirnbaum, Christina, Bissett, Andrew, Thrall, Peter H. and Leishman, Michelle R.
Journal TitleJournal of Biogeography
Journal Citation43 (8), pp. 1631-1644
Number of Pages14
YearAug 2016
PublisherJohn Wiley & Sons
Place of PublicationUnited Kingdom
ISSN0305-0270
1365-2699
Digital Object Identifier (DOI)https://doi.org/10.1111/jbi.12752
Web Address (URL)https://onlinelibrary.wiley.com/doi/10.1111/jbi.12752
Abstract

Aim
Understanding the interactions between invasive legumes and soil biota in both native and introduced ranges could assist in managing biological invasions. We analysed the diversity of putative nitrogen-fixing bacteria (NFB, i.e. nifH gene present) associated with five invasive legumes, four Acacia spp. and a sister taxon Paraserianthes lophantha in introduced and native range populations in Australia. We predicted that, because these host species are widely distributed, they are likely to encounter different nitrogen-fixing bacterial communities in soils and nodules across their introduced and native ranges.

Location
Australia.

Methods
NifH genes were amplified from rhizosphere soils collected from beneath each species (multiple populations) within their native and introduced range and directly from nodules collected from plants previously grown in the glasshouse using field-collected soil as inoculum. NifH gene sequences from soils and nodules were 454 pyrosequenced and assigned to taxonomic groups based on nifH consensus taxonomy.

Results
We found no difference in the NFB community of soils or nodules between native and introduced ranges across the five species, suggesting that these legumes encounter similar NFB communities in soils across Australia. Bradyrhizobium was the most abundant rhizobial genus present in both soils and nodules. Bradyrhizobium species found in nodules were significantly different across the ranges for A. longifolia.

Main conclusions
The results indicate that these invasive legumes have similar nitrogen-fixing bacterial communities in their rhizosphere and nodules across Australia, with the exception of A. longifolia. This species has diverse Bradyrhizobium genotypes in its nodules suggesting that A. longifolia may be a more generalist host compared to the other four legumes. Thus, it is unlikely that the invasive success of these legumes is constrained by the absence of suitable bacterial symbionts in soil. Better knowledge of legume–soil interactions could facilitate more informed and effective management of invasive legumes in their introduced ranges in Australia and elsewhere.

KeywordsAcacia; Australia; free-living nitrogen fixers; invasion; legumes; mutualism; rhizobia
ANZSRC Field of Research 2020310308. Terrestrial ecology
310703. Microbial ecology
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsMacquarie University
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australia
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