Microb Ecol. 2013 Nov;66(4):961-71. doi: 10.1007/s00248-013-0280-6.
In this study, we explore variation in resource use among Streptomyces in prairie soils. Resource use patterns were highly variable among Streptomyces isolates and were significantly related to location, phylogeny, and nitrogen (N) amendment history. Streptomyces populations from soils less than 1 m apart differed significantly in their ability to use resources, indicating that drivers of resource use phenotypes in soil are highly localized. Variation in resource use within Streptomyces genetic groups was significantly associated with the location from which Streptomyces were isolated, suggesting that resource use is adapted to local environments. Streptomyces from soils under long-term N amendment used fewer resources and grew less efficiently than those from non-amended soils, demonstrating that N amendment selects for Streptomyces with more limited catabolic capacities. Finally, resource use among Streptomyces populations was correlated with soil carbon content and Streptomyces population densities. We hypothesize that variation in resource use among Streptomyces reflects adaptation to local resource availability and competitive species interactions in soil and that N amendments alter selection for resource use phenotypes.
在这项研究中，我们探讨了草原土壤中链霉菌的资源利用变化。链霉菌分离物的资源利用模式差异很大，与地理位置、系统发育和氮（N）添加史显著相关。相距不到 1 米的土壤中的链霉菌种群在利用资源的能力上有显著差异，表明土壤中资源利用表型的驱动因素高度本地化。链霉菌遗传群内资源利用的变化与链霉菌分离的位置显著相关，表明资源利用适应于当地环境。长期接受 N 添加的土壤中的链霉菌比未添加土壤中的链霉菌使用的资源更少，生长效率更低，这表明 N 添加选择了具有更有限的分解代谢能力的链霉菌。最后，链霉菌种群之间的资源利用与土壤碳含量和链霉菌种群密度相关。我们假设链霉菌之间资源利用的变化反映了对土壤中当地资源可用性和竞争物种相互作用的适应，而 N 添加改变了对资源利用表型的选择。
