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Seasonal dynamics of microbial diversity in the rhizosphere of Ulmus pumila L. var. sabulosa in a steppe desert area of Northern China

机译：榆（Ulmus pumila L. var）根际微生物多样性的季节动态。北方草原荒漠地区的

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摘要

The seasonal dynamics of microbial diversity within the rhizosphere of Ulmus pumila L. var. sabulosa in the hinterland of the Otindag Sandy Land of China were investigated using high-throughput sequencing of bacterial 16S rRNA genes and fungal ITS region sequences. A significant level of bacterial and fungal diversity was observed overall, with detection of 7,676 bacterial Operational Taxonomic Units (OTUs) belonging to 40 bacteria phyla and 3,582 fungal OTUs belonging to six phyla. Proteobacteria, Actinobacteria, and Firmicutes were the dominant bacterial phyla among communities, while Ascomycota, Basidiomycota, and Zygomycota were the dominant phyla of fungal communities. Seasonal changes influenced the α-diversity and β-diversity of bacterial communities within elm rhizospheres more than for fungal communities. Inferred functional analysis of the bacterial communities identified evidence for 41 level two KEGG (Kyoto Encyclopedia of Genes and Genomes) orthology groups, while guild-based analysis of the fungal communities identified eight ecological guilds. Metabolism was the most prevalent bacterial functional group, while saprotrophs prevailed among the identified fungal ecological guilds. Soil moisture and soil nutrient content were important factors that affected the microbial community structures of elm rhizospheres across seasons. The present pilot study provides an important baseline investigation of elm rhizosphere microbial communities.
机译：榆（Ulmus pumila L. var）根际内微生物多样性的季节性动态。使用细菌16S rRNA基因的高通量测序和真菌ITS区序列，对中国Otindag沙地腹地的小bul进行了调查。总体上观察到显着水平的细菌和真菌多样性，检测到属于40个细菌门的7,676个细菌操作分类单位（OTU）和属于六个门的3,582个真菌OTU。变形杆菌，放线菌和硬毛菌是群落中的优势菌门，而子囊菌，担子菌和合子菌是真菌群落的优势菌门。季节变化对榆树根际内细菌群落的α多样性和β多样性的影响大于对真菌群落的影响。对细菌群落的推断功能分析确定了41个二级KEGG（基因和基因组京都百科全书）矫正组的证据，而基于行会的真菌群落分析确定了八个生态行会。代谢是最普遍的细菌功能组，而腐生菌在确定的真菌生态协会中占主导地位。土壤水分和养分含量是影响整个季节榆树根际微生物群落结构的重要因素。本试验研究提供了榆树根际微生物群落的重要基线调查。

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