Sulfate-reducing bacteria in floating macrophyte rhizospheres from an Amazonian floodplain lake in Bolivia and their association with Hg methylation

Darío Achá, Volga Iñiguez, Marc Roulet, Jean Remy Davée Guimarães, Ruddy Luna, Lucia Alanoca, Samanta Sanchez

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

70 Citas (Scopus)

Resumen

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.

Idioma originalInglés
Páginas (desde-hasta)7531-7535
Número de páginas5
PublicaciónApplied and Environmental Microbiology
Volumen71
N.º11
DOI
EstadoPublicada - nov. 2005

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