Linking ecology and systematics of acidobacteria: Distinct habitat preferences of the Acidobacteriia and Blastocatellia in tundra soils
Linking ecology and systematics of acidobacteria: Distinct habitat preferences of the Acidobacteriia and Blastocatellia in tundra soils
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DOI：
10.1371/journal.pone.0230157
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发表时间：
2020-03-17
期刊：
影响因子：
3.7
通讯作者：
Dedysh, Svetlana N.
中科院分区：
文献类型：
--
作者：
Ivanova, Anastasia A.;Zhelezova, Alena D.;Dedysh, Svetlana N.
酸杆菌是土壤和泥炭地中的主要细菌门之一。目前探索的多样性在这个门被分配到15个类级单位，其中五个包含描述的成员。不同种类的酸细菌的生态相关特性仍然知之甚少。在这里，我们比较了模式的酸化细菌多样性的桑迪土壤的苔原，沿着梯度增加植被不固定的风成沙，半固定表面的苔藓和地衣，和成熟的土壤下充分发达的植物覆盖。从这些土壤中检索到的酸杆菌属的16S rRNA基因序列占细菌总读数的11%至33%，并且主要属于酸杆菌属和芽囊菌属的成员，其表现出相反的栖息地偏好。Blastocatellia的相对丰度在未固定的沙地中最大，在植被样地的土壤中下降，与土壤pH值呈正相关，与碳和氮的有效性呈负相关。酸杆菌属的特征是相反的趋势。大多数Blastocatella附属读取属于尚未描述的家庭Arenimicrobiaceae的成员，这似乎是干燥的特点，耗尽有机质土壤栖息地。除了酸杆菌科和苔藓菌科相关的读数外，酸杆菌属附属序列的池中有很大比例的序列来自尚未描述的家族，这些家族似乎专门降解植物来源的有机物。这项分析揭示了桑迪土壤的苔原作为一种新的酸细菌多样性的来源，并提供了一个洞察不同的分类群体在这个门的生态偏好。
The Acidobacteria is one of the major bacterial phyla in soils and peatlands. The currently explored diversity within this phylum is assigned to 15 class-level units, five of which contain described members. The ecologically relevant traits of acidobacteria from different classes remain poorly understood. Here, we compared the patterns of acidobacterial diversity in sandy soils of tundra, along a gradient of increasing vegetation-unfixed aeolian sand, semi-fixed surfaces with mosses and lichens, and mature soil under fully developed plant cover. The Acidobacteria-affiliated 16S rRNA gene sequences retrieved from these soils comprised 11 to 33% of total bacterial reads and belonged mostly to members of the classes Acidobacteriia and Blastocatellia, which displayed opposite habitat preferences. The relative abundance of the Blastocatellia was maximal in unfixed sands and declined in soils of vegetated plots, showing positive correlation with soil pH and negative correlation with carbon and nitrogen availability. An opposite tendency was characteristic for the Acidobacteriia. Most Blastocatellia-affiliated reads belonged to as-yet-undescribed members of the family Arenimicrobiaceae, which appears to be characteristic for dry, depleted in organic matter soil habitats. The pool of Acidobacteriia-affiliated sequences, apart from Acidobacteriaceae-and Bryobacteraceae-related reads, had a large proportion of sequences from as-yet-undescribed families, which seem to specialize in degrading plant-derived organic matter. This analysis reveals sandy soils of tundra as a source of novel acidobacterial diversity and provides an insight into the ecological preferences of different taxonomic groups within this phylum.