In contrast, bacterial strains belonging to closely related Herbaspirillum and Janthinobacterium genera were inefficient or poorly efficient in weathering biotite. From an evolutionary point of view, the ability of Collimonads to use specific fungal-derivative metabolites, to colonize poor nutrient environments and to efficiently weather minerals suggests an adaptive evolution of the Collimonas genus to oligotrophic conditions. Based on these findings in forest soils, Collimonas and, to a lesser extent B. glathei, could be considered, in the absence of currently identified marker genes of the mineral-weathering function, as bioindicators of soil status (oligotrophic environment) and bacterial weathering potential
In this sense, recent use of pyrosequencing confirmed that Burkholderia is a major genus in forest soil and, moreover, that it is enriched in the tree rhizosphere, confirming the selection of efficient mineralweathering bacteria by trees (Uroz et al., 2010). In contrast, the Collimonas genus is comparatively rare amongst microbial communities but is functionally important.
In contrast, bacterial strains belonging to closely related Herbaspirillum and Janthinobacterium genera were inefficient or poorly efficient in weathering biotite. From an evolutionary point of view, the ability of Collimonads to use specific fungal-derivative metabolites, to colonize poor nutrient environments and to efficiently weather minerals suggests an adaptive evolution of the Collimonas genus to oligotrophic conditions. Based on these findings in forest soils, Collimonas and, to a lesser extent B. glathei, could be considered, in the absence of currently identified marker genes of the mineral-weathering function, as bioindicators of soil status (oligotrophic environment) and bacterial weathering potentialIn this sense, recent use of pyrosequencing confirmed that Burkholderia is a major genus in forest soil and, moreover, that it is enriched in the tree rhizosphere, confirming the selection of efficient mineralweathering bacteria by trees (Uroz et al., 2010). In contrast, the Collimonas genus is comparatively rare amongst microbial communities but is functionally important.
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