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Applied and Environmental Microbiology, November 2005, p. 7461-7471, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7461-7471.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Proof that Burkholderia Strains Form Effective Symbioses with Legumes: a Study of Novel Mimosa-Nodulating Strains from South America

Wen-Ming Chen,1 Sergio M. de Faria,2 Rosângela Straliotto,2 Rosa M. Pitard,2 Jean L. Simões-Araùjo,2 Jui-Hsing Chou,1 Yi-Ju Chou,1 Edmundo Barrios,3 Alan R. Prescott,4 Geoffrey N. Elliott,4 Janet I. Sprent,5 J. Peter W. Young,6 and Euan K. James4*

Laboratory of Microbiology, Department of Seafood Science, National Kaohsiung Marine University, Kaohsiung City 811, Taiwan,1 EMBRAPA-Agrobiologia, Km 47, Seropédica, 23851-970 Rio de Janeiro, Brazil,2 Tropical Soil Biology and Fertility Institute of Centro Internacional de Agricultura Tropical (TSBF-CIAT), A.A. 6713, Cali, Colombia,3 CHIPs, MSI/WTB Complex, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom,4 Division of Environmental and Applied Biology, School of Life Sciences, University of Dundee, Dundee DD1 4HN, United Kingdom,5 Department of Biology 3, University of York, P.O. Box 373, York YO10 5YW, United Kingdom6

Received 10 January 2005/ Accepted 22 June 2005

Twenty Mimosa-nodulating bacterial strains from Brazil and Venezuela, together with eight reference Mimosa-nodulating rhizobial strains and two other ß-rhizobial strains, were examined by amplified rRNA gene restriction analysis. They fell into 16 patterns and formed a single cluster together with the known ß-rhizobia, Burkholderia caribensis, Burkholderia phymatum, and Burkholderia tuberum. The 16S rRNA gene sequences of 15 of the 20 strains were determined, and all were shown to belong to the genus Burkholderia; four distinct clusters could be discerned, with strains isolated from the same host species usually clustering very closely. Five of the strains (MAP3-5, Br3407, Br3454, Br3461, and Br3469) were selected for further studies of the symbiosis-related genes nodA, the NodD-dependent regulatory consensus sequences (nod box), and nifH. The nodA and nifH sequences were very close to each other and to those of B. phymatum STM815, B. caribensis TJ182, and Cupriavidus taiwanensis LMG19424 but were relatively distant from those of B. tuberum STM678. In addition to nodulating their original hosts, all five strains could also nodulate other Mimosa spp., and all produced nodules on Mimosa pudica that had nitrogenase (acetylene reduction) activities and structures typical of effective N2-fixing symbioses. Finally, both wild-type and green fluorescent protein-expressing transconjugant strains of Br3461 and MAP3-5 produced N2-fixing nodules on their original hosts, Mimosa bimucronata (Br3461) and Mimosa pigra (MAP3-5), and hence this confirms strongly that Burkholderia strains can form effective symbioses with legumes.

* Corresponding author. Mailing address: CHIPs, MSI/WTB Complex, School of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom. Phone: 44-1382-344741. Fax: 44-1382-345893. E-mail: e.k.james{at}dundee.ac.uk.

Applied and Environmental Microbiology, November 2005, p. 7461-7471, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7461-7471.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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