論文 - 詳細
| RRC ID | 34407 |
|---|---|
| 著者 | Stevenson A, Hallsworth JE. |
| タイトル | Water and temperature relations of soil Actinobacteria. |
| ジャーナル | Environ Microbiol Rep |
| Abstract |
Actinobacteria perform essential functions within soils, and are dependent on available water to do so. We determined the water-activity (aw ) limits for cell division of Streptomyces albidoflavus, Streptomyces rectiviolaceus, Micromonospora grisea and Micromonospora (JCM 3050) over a range of temperatures, using culture media supplemented with a biologically permissive solute (glycerol). Each species grew optimally at 0.998 aw (control; no added glycerol) and growth rates were near-optimal in the range 0.971-0.974 (1 M glycerol) at permissive temperatures. Each was capable of cell division at 0.916-0.924 aw (2 M glycerol), but only S. albidoflavus grew at 0.895 or 0.897 aw (3 M glycerol, at 30 and 37°C respectively). For S. albidoflavus, however, no growth occurred on media at ≤ 0.870 (4 M glycerol) during the 40-day assessment period, regardless of temperature, and a theoretical limit of 0.877 aw was derived by extrapolation of growth curves. This level of solute tolerance is high for non-halophilic bacteria, but is consistent with reported limits for the growth and metabolic activities of soil microbes. The limit, within the range 0.895-0.870 aw , is very much inferior to those for obligately halophilic bacteria and extremely halophilic or xerophilic fungi, and is inconsistent with earlier reports of cell division at 0.500 aw . These findings are discussed in relation to planetary protection policy for space exploration and the microbiology of arid soils. |
| 巻・号 | 6(6) |
| ページ | 744-55 |
| 公開日 | 2014-12-1 |
| DOI | 10.1111/1758-2229.12199 |
| PMID | 25132485 |
| MeSH | Actinobacteria / growth & development* Actinobacteria / metabolism Culture Media / chemistry Culture Media / metabolism Hydrogen-Ion Concentration Soil / chemistry Soil Microbiology Temperature Water / analysis* Water / metabolism |
| IF | 2.975 |
| 引用数 | 41 |
| WOS 分野 | ENVIRONMENTAL SCIENCES MICROBIOLOGY |
| オルトメトリクス指標 |
オルトメトリクス指標項目
|
| 最多言及媒体 | X(Twitter) |
| 各媒体での言及数の合計 | 1 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| 一般微生物 | JCM 3050 JCM 3182 JCM 4198 JCM 9092 |