Unexpected and novel putative viruses in the sediments of a deep-dark permanently anoxic freshwater habitat. - Université Clermont Auvergne Accéder directement au contenu
Article Dans Une Revue The International Society of Microbiologial Ecology Journal Année : 2012

Unexpected and novel putative viruses in the sediments of a deep-dark permanently anoxic freshwater habitat.

Résumé

Morphological diversity, abundance and community structure of viruses were examined in the deep and anoxic sediments of the volcanic Lake Pavin (France). The sediment core, encompassing 130 years of sedimentation, was subsampled every centimeter. High viral abundances were recorded and correlated to prokaryotic densities. Abundances of viruses and prokaryotes decreased with the depth, contrasting the pattern of virus-to-prokaryote ratio. According to fingerprint analyses, the community structure of viruses, bacteria and archaea gradually changed, and communities of the surface (0-10 cm) could be discriminated from those of the intermediate (11-27 cm) and deep (28-40 cm) sediment layers. Viral morphotypes similar to virions of ubiquitous dsDNA viruses of bacteria were observed. Exceptional morphotypes, previously never reported in freshwater systems, were also detected. Some of these resembled dsDNA viruses of hyperthermophilic and hyperhalophilic archaea. Moreover, unusual types of spherical and cubic virus-like particles (VLPs) were observed. Infected prokaryotic cells were detected in the whole sediment core, and their vertical distribution correlated with both viral and prokaryotic abundances. Pleomorphic ellipsoid VLPs were visible in filamentous cells tentatively identified as representatives of the archaeal genus Methanosaeta, a major group of methane producers on earth.

Dates et versions

hal-00819247 , version 1 (30-04-2013)

Identifiants

Citer

Guillaume Borrel, Jonathan Colombet, Agnès Robin, Anne-Catherine Lehours, David Prangishvili, et al.. Unexpected and novel putative viruses in the sediments of a deep-dark permanently anoxic freshwater habitat.. The International Society of Microbiologial Ecology Journal, 2012, 6 (11), pp.2119-27. ⟨10.1038/ismej.2012.49⟩. ⟨hal-00819247⟩
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