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首页> 外文期刊>Applied Microbiology >Contrasting Patterns in Diversity and Community Assembly of Phragmites australis Root-Associated Bacterial Communities from Different Seasons
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Contrasting Patterns in Diversity and Community Assembly of Phragmites australis Root-Associated Bacterial Communities from Different Seasons

机译：来自不同季节的芦苇澳洲相关细菌社区的多样性和社区组装的对比模式

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The common reed ( Phragmites australis ), a cosmopolitan aquatic macrophyte, plays an important role in the structure and function of aquatic ecosystems. We compared bacterial community compositions (BCCs) and their assembly processes in the root-associated compartments (i.e., rhizosphere and endosphere) of reed and bulk sediment between summer and winter. The BCCs were analyzed using high-throughput sequencing of the bacterial 16S rRNA gene; meanwhile, null-model analysis was employed to characterize their assembly mechanisms. The sources of the endosphere BCCs were quantitatively examined using SourceTracker from bulk sediment, rhizosphere, and seed. We observed the highest α-diversity and the lowest β-diversity of BCCs in the rhizosphere in both seasons. We also found a significant increase in α- and β-diversity in summer compared to that in winter among the three compartments. It was demonstrated that rhizosphere sediments were the main source (～70%) of root endosphere bacteria during both seasons. Null-model tests indicated that stochastic processes primarily affected endosphere BCCs, whereas both deterministic and stochastic processes dictated bacterial assemblages of the rhizosphere, with the relative importance of stochastic versus deterministic processes depending on the season. This study suggests that multiple mechanisms of bacterial selection and community assembly exist both inside and outside P. australis roots in different seasons.IMPORTANCE Understanding the composition and assembly mechanisms of root-associated microbial communities of plants is crucial for understanding the interactions between plants and soil. Most previous studies of the plant root-associated microbiome focused on model and economic plants, with fewer temporal or seasonal investigations. The assembly mechanisms of root-associated bacterial communities in different seasons remain poorly known, especially for the aquatic macrophytes. In this study, we compared the diversity, composition, and relative importance of two different assembly processes (stochastic and deterministic processes) of bacterial communities associated with bulk sediment and the rhizosphere and endosphere of Phragmites australis in summer and winter. While we found apparent differences in composition, diversity, and assembly processes of bacterial communities among different compartments, season played important roles in determining BCCs and their diversity patterns and assemblages. We also found that endosphere bacteria mainly originated from the rhizosphere. The results add new knowledge regarding the plant-microbe interactions in aquatic ecosystems.
机译：常见的芦苇（芦苇澳大利亚人）是一个过多的水生产物宏观物质在水生生态系统的结构和功能中起着重要作用。我们将细菌群落组合物（BCCS）及其组装过程与夏季和冬季之间的根系和散装沉积物中的根部相关隔室（即根际和圆形圈）进行比较。使用细菌16s rRNA基因的高通量测序分析BCCS;同时，采用零模型分析来表征其装配机制。使用Sourcetracker从散装沉积物，根际和种子中定量地检查难度的骨晶体BCC的来源。我们在两个季节中观察到了最高的α-多样性和根际BCC的最低β-多样性。与三个隔间中的冬季相比，我们还发现夏天的α-和β-多样性显着增加。据证明，根际沉积物是两种季节的根胸椎细菌的主要来源（〜70％）。零模型试验表明随机过程主要影响难度晶体博彩，而确定性和随机过程均对根际的细菌组装，随机与确定性过程的相对重要性取决于季节。本研究表明，在不同季节的P.澳大利亚根部内外，存在多种细菌选择和社区组装机制。分析，了解根系相关的微生物社区的组成和组装机制植物的组成和组装机制对于了解植物和土壤之间的相互作用至关重要。最先前的植物根源微生物组研究专注于模型和经济植物，时间或季节性调查较少。不同季节的根系细菌社区的组装机制仍然已知是众所周知的，特别是对于水生甲状腺素。在这项研究中，我们将两种不同的组装过程（随机和确定方法）进行了与散装沉积物相关的细菌社区的多样性，组成和相对重要性，以及夏季和冬季芦苇芦苇的根际和骨质层。虽然我们发现不同隔间之间的细菌社区的组成，多样性和组装过程的明显差异，但季节在确定BCC和它们的多样性模式和组合中发挥了重要作用。我们还发现，肢体晶间细菌主要来自根际。结果为水生生态系统中的植物微生物相互作用增加了新的知识。

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