Physiological Basis of the Selective Advantage of a Spirillum sp. in a Carbon-limited Environment

Matin, Abdul; Veldkamp, H.

doi:10.1099/00221287-105-2-187

Cited by 94 publications

(49 citation statements)

References 13 publications

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“…This trade-off hypothesis, if valid, has important implications for understanding the structure of microbial communities, as well as for identifying strains that are most likely to be useful in applications such as bioremediation. Previous tests of this hypothesis have yielded mixed results [14,17,19,20,21,22,27,38,39,41], and the results of our study must be added to those that do not support this hypothesis. This lack of support for the trade-off hypothesis is consistent with recent discoveries in several microbes of both high-and low-affinity uptake systems for a variety of specific nutrients [6,24,31,34,42].…”

Section: Discussioncontrasting

confidence: 49%

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Application of Traditional and Phylogenetically Based Comparative Methods to Test for a Trade-off in Bacterial Growth Rate at Low versus High Substrate Concentration

Velicer¹,

Schmidt²,

Lenski³

1999

Microb Ecol

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A B S T R A C TIt is often hypothesized that those organisms that are superior competitors for sparse resources fare poorly in competition for abundant resources, and vice versa. If there is indeed such a systematic trade-off, then this has important implications for the choice of bacterial strains in bioremediation and other applications. We studied seven bacterial strains that can grow on either 2,4-dichlorophenoxyacetate (2,4-D) or succinate as a sole source of carbon. Growth rates were measured on each substrate at both low (5 µg/ml) and high (500 µg/ml) concentrations. We used two different methods to test the significance of correlations among growth rates, a traditional method that treats each strain as an independent observation and a newer method that takes into account phylogenetic relationships between strains, thereby avoiding spurious correlations caused by a lack of statistical independence of strains. In both 2,4-D and succinate, we observed significant positive correlations between growth rates measured at high and low substrate concentrations by the traditional comparative method. No significant correlations were detected after adjusting for the phylogenetic relationships among the strains. In neither case did we observe the negative correlation expected from a trade-off between growth rates at high and low substrate levels.

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Section: Discussioncontrasting

confidence: 49%

“…It is widely assumed that bacterial species cannot be successful competitors at both low and high resource concentrations, but instead they must pursue one strategy or the other [12,14,27]. This view is closely related to the distinction between r-and K-strategists in animals and plants [29,32].…”

Section: Introductionmentioning

confidence: 99%

Application of Traditional and Phylogenetically Based Comparative Methods to Test for a Trade-off in Bacterial Growth Rate at Low versus High Substrate Concentration

Velicer¹,

Schmidt²,

Lenski³

1999

Microb Ecol

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“…From a cell morphology point of view, Zoogloea may have a higher substrate affinity compared with P. acidivorans, because P. acidivorans cells were significantly larger than Zoogloea (1.8 mm vs 0.6 mm diameter). Larger cells have a lower surface to volume ratio, suggesting that P. acidivorans may have a lower substrate affinity (Matin and Veldkamp, 1978). Additionally, the use of a different inoculum might be another explanation for the absence of P. acidivorans in their system.…”

Section: Discussionmentioning

confidence: 99%

Effect of temperature and cycle length on microbial competition in PHB-producing sequencing batch reactor

et al. 2010

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The impact of temperature and cycle length on microbial competition between polyhydroxybutyrate (PHB)-producing populations enriched in feast-famine sequencing batch reactors (SBRs) was investigated at temperatures of 20 1C and 30 1C, and in a cycle length range of 1-18 h. In this study, the microbial community structure of the PHB-producing enrichments was found to be strongly dependent on temperature, but not on cycle length. Zoogloea and Plasticicumulans acidivorans dominated the SBRs operated at 20 1C and 30 1C, respectively. Both enrichments accumulated PHB more than 75% of cell dry weight. Short-term temperature change experiments revealed that P. acidivorans was more temperature sensitive as compared with Zoogloea. This is particularly true for the PHB degradation, resulting in incomplete PHB degradation in P. acidivorans at 20 1C. Incomplete PHB degradation limited biomass growth and allowed Zoogloea to outcompete P. acidivorans. The PHB content at the end of the feast phase correlated well with the cycle length at a constant solid retention time (SRT). These results suggest that to establish enrichment with the capacity to store a high fraction of PHB, the number of cycles per SRT should be minimized independent of the temperature.

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“…That higher levels of a catabolic enzyme are indeed of selective advantage to organisms when exposed to low concentrations of carbon sources is well documented in the literature (for reviews see 45, 68 109). Significantly, evidence (52,80) also suggests that environments, characterized by a constant low concentration of a specific carbon substrate, tend to select for organisms that have become constitutive with respect to the synthesis of enzymes involved in the early metabolism of that substrate.…”

Section: Regulate!on Of Intracellular Enzymesmentioning

confidence: 99%

Physiological Responses to Nutrient Limitation

Harder¹,

Dijkhuizen²

1983

Annu. Rev. Microbiol.

342

166

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Physiological Basis of the Selective Advantage of a Spirillum sp. in a Carbon-limited Environment

Cited by 94 publications

References 13 publications

Application of Traditional and Phylogenetically Based Comparative Methods to Test for a Trade-off in Bacterial Growth Rate at Low versus High Substrate Concentration

Application of Traditional and Phylogenetically Based Comparative Methods to Test for a Trade-off in Bacterial Growth Rate at Low versus High Substrate Concentration

Effect of temperature and cycle length on microbial competition in PHB-producing sequencing batch reactor

Physiological Responses to Nutrient Limitation

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