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Applied and Environmental Microbiology, December 2007, p. 8018-8022, Vol. 73, No. 24
0099-2240/07/$08.00+0     doi:10.1128/AEM.01431-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Nickel Resistance Determinants in Bradyrhizobium Strains from Nodules of the Endemic New Caledonia Legume Serianthes calycina{triangledown} ,{dagger}

Clémence Chaintreuil,1* Frédéric Rigault,2 Lionel Moulin,1 Tanguy Jaffré,2 Joël Fardoux,1 Eric Giraud,1 Bernard Dreyfus,1 and Xavier Bailly1

Laboratoire des Symbioses Tropicales et Méditerranéennes (UMR113), IRD/CIRAD/SUPAGRO/INRA/UM2, Montpellier, France,1 Laboratoire de Botanique et d'Ecologie Végétale, IRD, Nouméa, Nouvelle-Calédonie2

Received 27 June 2007/ Accepted 5 October 2007

Bradyrhizobium strains, isolated in New Caledonia from nodules of the endemic legume Serianthes calycina growing in nickel-rich soils, were able to grow in the presence of 15 mM NiCl2. The genomes of these strains harbored two Ni resistance determinants, the cnr and nre operons. By constructing a cnrA mutant, we demonstrated that the cnr operon determines the high nickel resistance in Bradyrhizobium strains.

* Corresponding author. Mailing address: LSTM, Campus International de Baillarguet, TA A-82/J, 34398 Montpellier Cedex 5, France. Phone: (334) 67 59 38 51. Fax: (334) 67 59 38 02. E-mail: clemence.chaintreuil{at}mpl.ird.fr

{triangledown} Published ahead of print on 19 October 2007.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

Applied and Environmental Microbiology, December 2007, p. 8018-8022, Vol. 73, No. 24
0099-2240/07/$08.00+0     doi:10.1128/AEM.01431-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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