Dong Qiang, Guo Xin, Chen Keyu, Ren Shijie, Muneer Muhammad Atif, Zhang Jing, Li Yaoming, Ji Baoming
School of Grassland Science, Beijing Forestry University, Beijing, China.
College of Resources and Environment, International Magnesium Institute, Fujian Agriculture and Forestry University, Fuzhou, China.
Front Plant Sci. 2021 Dec 17;12:804861. doi: 10.3389/fpls.2021.804861. eCollection 2021.
Plants and arbuscular mycorrhizal fungi (AMF) can form complex symbiotic networks based on functional trait selection, contributing to the maintenance of ecosystem biodiversity and stability. However, the selectivity of host plants on AMF and the characteristics of plant-AMF networks remain unclear in Tibetan alpine meadows. In this study, we studied the AMF communities in 69 root samples from 23 plant species in a Tibetan alpine meadow using Illumina-MiSeq sequencing of the 18S rRNA gene. The results showed a significant positive correlation between the phylogenetic distances of plant species and the taxonomic dissimilarity of their AMF community. The plant-AMF network was characterized by high connectance, high nestedness, anti-modularity, and anti-specialization, and the phylogenetic signal from plants was stronger than that from AMF. The high connected and nested plant-AMF network potentially promoted the interdependence and stability of the plant-AMF symbioses in Tibetan alpine meadows. This study emphasizes that plant phylogeny and plant-AMF networks play an important role in the coevolution of host plants and their mycorrhizal partners and enhance our understanding of the interactions between aboveground and belowground communities.
植物与丛枝菌根真菌（AMF）能够基于功能性状选择形成复杂的共生网络，这有助于维持生态系统的生物多样性与稳定性。然而，在青藏高原高寒草甸中，宿主植物对AMF的选择性以及植物-AMF网络的特征仍不清楚。在本研究中，我们利用18S rRNA基因的Illumina-MiSeq测序技术，对青藏高原高寒草甸中23种植物的69个根系样本中的AMF群落进行了研究。结果表明，植物物种的系统发育距离与其AMF群落的分类学差异之间存在显著的正相关关系。植物-AMF网络具有高连接度、高嵌套性、反模块性和反专一性的特征，并且来自植物的系统发育信号强于来自AMF的信号。高度连接且嵌套的植物-AMF网络可能促进了青藏高原高寒草甸中植物-AMF共生关系的相互依存性与稳定性。本研究强调，植物系统发育和植物-AMF网络在宿主植物与其菌根伙伴的协同进化中发挥着重要作用，并增进了我们对地上与地下群落间相互作用的理解。
