Comparative Analysis of Myxococcus Predation on Soil Bacteria
Comparative Analysis of Myxococcus Predation on Soil Bacteria
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DOI：
10.1128/aem.00414-10
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发表时间：
2010-10-01
影响因子：
4.4
通讯作者：
Velicer, Gregory J.
中科院分区：
文献类型：
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作者：
Morgan, Andrew D.;MacLean, R. Craig;Velicer, Gregory J.
原核生物之间的捕食-被捕食关系很少受到关注，但很可能是微生物群落组成、结构和动态的重要决定因素。许多生活在土壤中的粘细菌是其他微生物的捕食者，但它们的捕食范围没有得到很好的描述。为了更好地了解粘菌在自然界中的捕食能力，我们分析了大量粘球菌分离株对12种不同细菌的捕食性能。所有的捕食者分离株都可以利用大多数潜在的猎物物种来有效地促进群体扩张，尽管有一个物种相对于没有生长底物的对照处理阻碍了捕食者的成群。捕食者菌株在不同猎物类型之间的相对性能差异很大，但捕食性能的大部分差异由猎物类型决定，革兰氏阴性猎物物种比革兰氏阳性猎物物种支持更多的粘球菌生长。有证据表明，在一些捕食者-猎物组合中，有专门的捕食者表现。这种专门化可能会减少自然栖息地共域菌株之间的资源竞争。粘细菌属广泛的捕食范围，再加上它在土壤中的普遍存在，表明粘细菌可能对许多土壤原核生物物种具有非常重要的生态和进化影响。
Predator-prey relationships among prokaryotes have received little attention but are likely to be important determinants of the composition, structure, and dynamics of microbial communities. Many species of the soil-dwelling myxobacteria are predators of other microbes, but their predation range is poorly characterized. To better understand the predatory capabilities of myxobacteria in nature, we analyzed the predation performance of numerous Myxococcus isolates across 12 diverse species of bacteria. All predator isolates could utilize most potential prey species to effectively fuel colony expansion, although one species hindered predator swarming relative to a control treatment with no growth substrate. Predator strains varied significantly in their relative performance across prey types, but most variation in predatory performance was determined by prey type, with Gram-negative prey species supporting more Myxococcus growth than Gram-positive species. There was evidence for specialized predator performance in some predator-prey combinations. Such specialization may reduce resource competition among sympatric strains in natural habitats. The broad prey range of the Myxococcus genus coupled with its ubiquity in the soil suggests that myxobacteria are likely to have very important ecological and evolutionary effects on many species of soil prokaryotes.