Sugar and organic acid availability modulate soil diazotroph community assembly and species co-occurrence patterns on the Tibetan Plateau
Sugar and organic acid availability modulate soil diazotroph community assembly and species co-occurrence patterns on the Tibetan Plateau
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DOI：
10.1007/s00253-021-11629-9
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发表时间：
2021-10-18
影响因子：
5
通讯作者：
He, Shuai
中科院分区：
文献类型：
--
作者：
Ding, Xiaowei;Liu, Kaihui;He, Shuai
代谢产物可以介导物种间的相互作用和微生物群落的组装。然而，这些化学品如何涉及到组装过程和共生模式的固氮组合在根相关的土壤仍然在很大程度上未知。在这里，我们研究了重氮营养群落的多样性和组装，并进一步破译它们与代谢物的联系。我们发现，糖和有机酸在根相关土壤中的分布显着相关的固氮生物的丰富度。这两种土壤代谢产物的存在解释了固氮菌群落组成的变异性。这些代谢物的差异浓度显着链接到不同的丰度固氮类群在同一土地类型占主导地位的不同植物或不同的土壤由相同的植物。重氮营养群落的组装是受确定性的生态过程，这是广泛调制的种类和数量的糖和有机酸。有机酸，如3-（4-羟基苯基）丙酸和柠檬酸，是有效的预测的重氮营养组合的特点，在沙漠栖息地。固氮共生网络往往更复杂，并连接在同一植物物种覆盖的不同土地类型。共生网络中，固氮菌、固氮菌、慢生根瘤菌和中生根瘤菌等关键种的分布与多种糖和有机酸的浓度存在显著的耦合关系。这些发现为青藏高原荒漠生态系统根系固氮营养群落的组装机制提供了新的见解。
Metabolites can mediate species interactions and the assembly of microbial communities. However, how these chemicals relate to the assembly processes and co-occurrence patterns of diazotrophic assemblages in root-associated soils remains largely unknown. Here, we examined the diversity and assembly of diazotrophic communities and further deciphered their links with metabolites on Tibetan Plateau. We found that the distribution of sugars and organic acids in the root-associated soils was significantly correlated with the richness of diazotrophs. The presence of these two soil metabolites explains the variability in diazotrophic community compositions. The differential concentrations of these metabolites were significantly linked with the distinctive abundances of diazotrophic taxa in same land types dominated by different plants or dissimilar soils by same plants. The assembly of diazotrophic communities is subject to deterministic ecological processes, which are widely modulated by the variety and amount of sugars and organic acids. Organic acids, for instance, 3-(4-hydroxyphenyl)propionic acid and citric acid, were effective predictors of the characteristics of diazotrophic assemblages across desert habitats. Diazotrophic co-occurrence networks tended to be more complex and connected within different land types covered by the same plant species. The concentrations of multiple sugars and organic acids were coupled significantly with the distribution of keystone species, such as Azotobacter, Azospirillum, Bradyrhizobium, and Mesorhizobium, in the co-occurrence network. These findings provide new insights into the assembly mechanisms of root-associated diazotrophic communities across the desert ecosystems of the Tibetan Plateau.