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Applied and Environmental Microbiology, November 2005, p. 7531-7535, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7531-7535.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Sulfate-Reducing Bacteria in Floating Macrophyte Rhizospheres from an Amazonian Floodplain Lake in Bolivia and Their Association with Hg Methylation

Darío Achá,1* Volga Iñiguez,1 Marc Roulet,2 Jean Remy Davée Guimarães,3 Ruddy Luna,1 Lucia Alanoca,2 and Samanta Sanchez1

Instituto de Biología Molecular y Biotecnología, Facultad de Ciencias Puras, Universidad Mayor de San Andrés, C. 27 Campus Universitario Cota Cota, La Paz, Bolivia,1 Institut de Recherche pour le Developpement, HYBAM, UMR154-LMTG, CP 9214, La Paz, Bolivia,2 Laboratorio de Traçadores, IBCCF, Bloco G/CCS/Ilha do Fundão, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil3

Received 25 March 2005/ Accepted 24 June 2005

Five subgroups of sulfate-reducing bacteria (SRB) were detected by PCR in three macrophyte rhizospheres (Polygonum densiflorum, Hymenachne donacifolia, and Ludwigia helminthorriza) and three subgroups in Eichhornia crassipes from La Granja, a floodplain lake from the upper Madeira basin. The SRB community varied according to the macrophyte species but with different degrees of association with their roots. The rhizosphere of the C4 plant Polygonum densiflorum had higher frequencies of SRB subgroups as well as higher mercury methylation potentials (27.5 to 36.1%) and carbon (16.06 ± 5.40%), nitrogen (2.03 ± 0.64%), Hg (94.50 ± 6.86 ng Hg g–1), and methylmercury (8.25 ± 1.45 ng Hg g–1) contents than the rhizosphere of the C3 plant Eichhornia crassipes. Mercury methylation in Polygonum densiflorum and Eichhornia crassipes was reduced when SRB metabolism was inhibited by sodium molybdate.

* Corresponding author. Mailing address: Watershead Ecosystems Graduate Programe, Trent University, Symons Campus, 1600 West Bank Drive, Peterborough, ON K9J 7B8, Canada. Phone: (705) 740-9030. Fax: (705) 748-1625. E-mail: darioacha{at}yahoo.ca.

Applied and Environmental Microbiology, November 2005, p. 7531-7535, Vol. 71, No. 11
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.11.7531-7535.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.





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