ArticleFrontiers in microbiology2015
Variability of rRNA Operon Copy Number and Growth Rate Dynamics of Bacillus Isolated from an Extremely Oligotrophic Aquatic Ecosystem.
Article in Frontiers in microbiology, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 20 papers.
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20 citing papers in PubMed, 54 citations in OpenAlex.
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- Cell size, genome size, and maximum growth rate are near-independent dimensions of ecological variation across bacteria and archaea.Ecology and evolution · 2021Article
- Population genomics of Vibrionaceae isolated from an endangered oasis reveals local adaptation after an environmental perturbation.BMC genomics · 2020Article
- The SNAP hypothesis: Chromosomal rearrangements could emerge from positive Selection during Niche Adaptation.PLoS genetics · 2020Article
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- Predictive genomic traits for bacterial growth in culture versus actual growth in soil.The ISME journal · 2019Article
- Pseudomonas putida rDNA is a favored site for the expression of biosynthetic genes.Scientific reports · 2019Article
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- Comparative genomic and functional analyses of four sequenced Bacillus cereus genomes reveal conservation of genes relevant to plant-growth-promoting traits.Scientific reports · 2018Article
- Bacterial carbon use plasticity, phylogenetic diversity and the priming of soil organic matter.The ISME journal · 2017Article
- Ecological strategies and metabolic trade-offs of complex environmental biofilms.NPJ biofilms and microbiomes · 2017Article
- Nutrient Stoichiometry Shapes Microbial Community Structure in an Evaporitic Shallow Pond.Frontiers in microbiology · 2017Article
- Article
Corrections and comments
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Authors and funding
9 authors at 5 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The ribosomal RNA (rrn) operon is a key suite of genes related to the production of protein synthesis machinery and thus to bacterial growth physiology. Experimental evidence has suggested an intrinsic relationship between the number of copies of this operon and environmental resource availability, especially the availability of phosphorus (P), because bacteria that live in oligotrophic ecosystems usually have few rrn operons and a slow growth rate. The Cuatro Ciénegas Basin (CCB) is a complex aquatic ecosystem that contains an unusually high microbial diversity that is able to persist under highly oligotrophic conditions. These environmental conditions impose a variety of strong selective pressures that shape the genome dynamics of their inhabitants. The genus Bacillus is one of the most abundant cultivable bacterial groups in the CCB and usually possesses a relatively large number of rrn operon copies (6-15 copies). The main goal of this study was to analyze the variation in the number of rrn operon copies of Bacillus in the CCB and to assess their growth-related properties as well as their stoichiometric balance (N and P content). We defined 18 phylogenetic groups within the Bacilli clade and documented a range of from six to 14 copies of the rrn operon. The growth dynamic of these Bacilli was heterogeneous and did not show a direct relation to the number of operon copies. Physiologically, our results were not consistent with the Growth Rate Hypothesis, since the copies of the rrn operon were decoupled from growth rate. However, we speculate that the diversity of the growth properties of these Bacilli as well as the low P content of their cells in an ample range of rrn copy number is an adaptive response to oligotrophy of the CCB and could represent an ecological mechanism that allows these taxa to coexist. These findings increase the knowledge of the variability in the number of copies of the rrn operon in the genus Bacillus and give insights about the physiology of this bacterial group under extreme oligotrophic conditions.
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