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Evaluating robustness of a diesel-degrading bacterial consortium isolated from contaminated soil

机译：评估从污染土壤中分离出的柴油降解细菌财团的稳健性

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It is not known whether diesel-degrading bacterial communities are structurally and functionally robust when exposed to different hydrocarbon types. Here, we exposed a diesel-degrading consortium to model either alkanes, cycloalkanes or aromatic hydrocarbons as carbon sources to study its structural resistance. The structural resistance was low, with changes in relative abundances of up to four orders of magnitude, depending on hydrocarbon type and bacterial taxon. This low resistance is explained by the presence of hydrocarbon-degrading specialists in the consortium and differences in growth kinetics on individual hydrocarbons. However, despite this low resistance, structural and functional resilience were high, as verified by re-exposing the hydrocarbon-perturbed consortium to diesel fuel. The high resilience is either due to the short exposure time, insufficient for permanent changes in consortium structure and function, or the ability of some consortium members to be maintained during exposure on degradation intermediates produced by other members. Thus, the consortium is expected to cope with short-term exposures to narrow carbon feeds, while maintaining its structural and functional integrity, which remains an advantage over biodegradation approaches using single species cultures. (C) 2016 Elsevier B.V. All rights reserved.
机译：未知柴油降解细菌群落在暴露于不同碳氢化合物类型时在结构和功能上是否健壮。在这里，我们暴露了一个可降解柴油的财团，以烷烃，环烷烃或芳烃为碳源建模，以研究其结构阻力。结构阻力很低，相对丰度的变化最多可达四个数量级，具体取决于碳氢化合物类型和细菌分类群。这种低抗性是由财团中存在降解碳氢化合物的专家以及各个碳氢化合物的生长动力学差异来解释的。但是，尽管阻力低，但结构和功能的回弹力却很高，这可以通过将碳氢化合物团重新暴露在柴油中来证明。高弹性要么是由于暴露时间短，不足以使财团的结构和功能发生永久性变化，要么是由于某些财团成员在暴露于其他成员产生的降解中间体期间得以维持的能力。因此，预计该财团将应对狭窄的碳原料的短期暴露，同时保持其结构和功能的完整性，与使用单一物种培养的生物降解方法相比，这仍然是一个优势。 （C）2016 Elsevier B.V.保留所有权利。

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