Fungal-Bacterial Cooccurrence Patterns Differ between Arbuscular Mycorrhizal Fungi and Nonmycorrhizal Fungi across Soil Niches

Abstract

Soils near living and decomposing roots form distinct niches that promote microorganisms with distinctive environmental preferences and interactions. Yet few studies have assessed the community-level cooccurrence of bacteria and fungi in these soil niches as plant roots grow and senesce.

Hyphae move matter and microbes to mineral microsites: Integrating the hyphosphere into conceptual models of soil organic matter stabilization

“…Bacterial community composition in the hyphosphere varies with nutritional demand in both mycorrhizal (Gorka et al, 2019; Wang et al, 2019); and saprotrophic fungi (Zhang et al, 2020), and the functional genomics of bacteria residing on a single fungal taxon can be experimentally altered based on nutrient addition (Zhang et al, 2020). Multiple lines of evidence suggest that the presence of individual fungal taxa can structure the composition and function of soil bacterial communities (Jeewani et al, 2021; Liu et al, 2018; Nuccio et al, 2013; Yuan et al, 2021; Zagryadskaya et al, 2011), which can subsequently impact organo‐mineral interactions (Jeewani et al, 2021). In sum, the fungal community composition of the hyphosphere affects the functional diversity of the bacterial communities colonizing soil minerals, with clear implications for the organic chemistry of MAOM formation.…”

A Single Application of Compost Can Leave Lasting Impacts on Soil Microbial Community Structure and Alter Cross-Domain Interaction Networks

“…Cross-domain networks provide a more comprehensive understanding of the complexity of soil communities than individual-domain networks. Using crossdomain network interactions such as those between prokaryotes and fungi can provide a greater understanding of beneficial, antagonistic, and associative interactions of the microbes in the soil system (35,37,84). This study revealed greater connectivity in cross-domain networks compared to individual-domain networks, and from these network associations, we can create and test hypotheses about how these organisms might interact.…”

“…Most previous soil microbial network studies have used single gene amplicon analyses to gain important insight on prokaryotic and eukaryotic network interactions. Current inference techniques exist that allow for analyses among multiple marker genes, giving insight into associations across biological domains and elucidate, for instance, the importance of fungi in stabilizing bacterial network connections in the human lung microbiome (35), or across soil profiles (36) and rhizospheres after wetups (37). Cross-domain network analyses applied to the soil microbiome offer unique opportunities to hypothesize interactions among communities of fungi, bacteria, and archaea, and how these interactions may ultimately lead to biological insights relevant to soil health such as the movement and cycling of nutrients in soil environment.…”

Community Assembly of Fungi and Bacteria along Soil-Plant Continuum Differs in a Zoige Wetland

“…In addition, the higher host selection intensity of AM plants on fungal community in roots from rhizosphere soil may be because of restrict screening on AM fungal groups to form mycorrhizal symbiont with roots but not in non-AM plant ( 36 , 37 , 40 ). By contrast, the lower host selection intensity of AM plants T. mongolicum and E. nutans on bacterial communities in roots from rhizosphere soil may be resulted from more habitat and nutrients provided in hyphosphere for bacteria by the AM fungi ( 81 – 84 ) compared with the non-AM plant C. enervis .…”