Effect of floristic composition and configuration on plant root mycobiota: a landscape transposition at a small scale

Mony, Cendrine; Brunellière, Philomène; Vannier, Nathan; Bittebière, Anne‐kristel; Vandenkoornhuyse, Philippe

doi:10.1111/nph.16262

Cited by 13 publications

(16 citation statements)

References 62 publications

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“…For instance, in the context of invasive plants, a set of studies demonstrated that AMF associated with native plant species were impacted by the presence and density of invasive plant species even at a short distance (Mummey & Rillig, 2006; Shi et al., 2014). Similar results were also obtained with indigenous plants species: recent works in grassland communities indeed demonstrated that the identity of plants growing within a distance of a few centimetres affected the richness and composition of the endophytic root mycobiota associated with a graminean plant species (Bittebiere et al., 2020; Mony et al., 2020). However, in the field, it is difficult to disentangle the direct effect of neighbouring plants on the microbiota assemblages from their indirect effect through modifications of the abiotic environmental conditions (i.e.…”

Section: Introductionsupporting

confidence: 77%

Plant neighbours shape fungal assemblages associated with plant roots: A new understanding of niche‐partitioning in plant communities

et al. 2021

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Understanding the assembly rules of mycorrhizal fungi is crucial, given their tremendous importance in plant nutrition and health. Differentiation in plant‐associated arbuscular mycorrhizal fungi (AMF) is likely driven by a host‐preference effect. Coexisting plant species may then affect a focal plant microbiota through fungal dispersal among plants, and plant preferential recruitment of AMF. Both mechanisms are likely shaped by the plant's phylogenetic and functional strategies. We expected that (a) the structure of AMF assemblages associated with a focal plant depends on the identity of the neighbouring plant species; (b) this effect would be predicted by the phylogenetic and functional similarity between the focal and neighbouring plant species. These predictions were tested during the first stages of growth, by simulating the early development of plants within a community Using an experimental matrix‐focal plant species design testing 15 neighbouring plants from five taxonomic families, we demonstrated that the neighbouring plants provided different species pools for the focal plant, Medicago truncatula, and influenced AMF communities associated with focal plant, especially in terms of richness but not relative evenness. Medicago truncatula grown with Brassicaceae or other Poaceae species displayed respectively no or low AMF richness compared to those grown with Rosaceae and Asteraceae species. These effects were weakly dependent on the phylogenetic distance from the neighbouring plant but were predicted by the functional proximity. AMF assemblages were enriched and bore more resemblance to the neighbouring plants when the neighbouring plants were functionally dissimilar from the focal one. Functional dissimilarity was only a significant predictor when based on traits characterizing the nutrient use and uptake strategy rather than on a more integrated growing strategy of the plant. Microbiota composition was shown to be dependent on the identity of the neighbouring plant, particularly on its functional below‐ground niche. At the colonization stage, when the plant arrives in a community, plant mycobiota might be influenced by the spatial distribution of plants already present in the community. This work suggests a new view of the concept of niche partitioning in space for plants based on microorganism–plant interactions. A free Plain Language Summary can be found within the Supporting Information of this article.

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Section: Introductionsupporting

confidence: 77%

Plant neighbours shape fungal assemblages associated with plant roots: A new understanding of niche‐partitioning in plant communities

et al. 2021

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“…More recently, landscape ecology principles were applied successfully to biotic landscapes, i.e., landscapes viewed as sets of hosts. Biotic landscape heterogeneity shaped endophytic fungal assemblages in plant roots at centimetric scales (Bittebiere et al, 2020;Mony et al, 2020a), with contrasted responses: Ascomycota depended on the floristic landscape composition through plant evenness and richness, while Basidiomycota depended on the floristic landscape configuration through host plant aggregation and connectivity (Mony et al, 2020a).…”

Section: Spatial Scales Of Microbial Landscapesmentioning

confidence: 99%

A Landscape of Opportunities for Microbial Ecology Research

et al. 2020

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Microbes encompass tremendous biodiversity, provide support to all living forms, including humans, and play an important role in many ecosystem services. The rules that govern microorganism community assembly are increasingly revealed due to key advances in molecular and analytical methods but their understanding remain a key challenge in microbial ecology. The existence of biogeographic patterns within microbial communities has been established and explained in relation to landscape-scale processes, including selection, drift, dispersal and mutation. The effect of habitat patchiness on microorganisms’ assembly rules remains though incompletely understood. Here, we review how landscape ecology principles can be adapted to explore new perspectives on the mechanisms that determine microbial community structure. To provide a general overview, we characterize microbial landscapes, the spatial and temporal scales of the mechanisms that drive microbial assembly and the feedback between microorganisms and landscape structure. We provide evidence for the effects of landscape heterogeneity, landscape fragmentation and landscape dynamics on microbial community structure, and show that predictions made for macro-organisms at least partly also apply to microorganisms. We explain why emerging metacommunity approaches in microbial ecology should include explicit characterization of landscape structure in their development and interpretation. We also explain how biotic interactions, such as competition, prey-predator or mutualist relations may influence the microbial landscape and may be involved in the above-mentioned feedback process. However, we argue that the application of landscape ecology to the microbial world cannot simply involve transposing existing theoretical frameworks. This is due to the particularity of these organisms, in terms of size, generation time, and for some of them, tight interaction with hosts. These characteristics imply dealing with unusual and dependent space and time scales of effect. Evolutionary processes have also a strong importance in microorganisms’ response to their landscapes. Lastly, microorganisms’ activity and distribution induce feedback effects on the landscape that have to be taken into account. The transposition of the landscape ecology framework to microorganisms provides many challenging research directions for microbial ecology.

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“…It displays a clonal plant that forms aggregated patches thanks to its phalanx growth form (sensu Lovett‐Doust ). B. pinnatum root‐associated mycobiota has been shown to differ depending on the surrounding plant composition and configuration (Bittebiere et al , Mony et al ). Individual B. pinnatum were sampled in 16 outdoor mesocosms (1.30 × 1.30 × 0.25 m) encompassing four different compositions of herbaceous grassland plant species, following an additive design, and with four replicates for each treatment: (1) a B. pinnatum monoculture, (2) a two‐species mixtures comprised B. pinnatum and Elytrigia repens , (3) a four‐species mixture comprised B. pinnatum , Agrostis tenuis , Festuca rubra , and Anthemis vulgaris , and (4) an eight‐species mixture comprised of the four species of mixture 3, plus Elytrigia repens , Agrostis stolonifera , Holcus mollis , and Ranunculus repens .…”

Section: Methodsmentioning

confidence: 99%

The influence of host‐plant connectivity on fungal assemblages in the root microbiota of Brachypodium pinnatum

Mony

Vannier

Brunellière

et al. 2020

Ecology

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Dispersal limitation may drive the structure of fungal microbiota of plant roots at small spatial scales. Fungal root microorganisms disperse through the plant rooting systems from hosts to hosts. Due to a pronounced host‐preference effect, the composition of endophytic root microbiota may follow plant distribution. A given plant community may hence include a matrix of host‐plant species that represent various habitat permeabilities to fungal dispersal in the floristic landscape. We experimentally tested the effect of host‐plant isolation on endophytic fungal assemblages (Ascomycota, Basidiomycota, Glomeromycotina) inhabiting Brachypodium pinnatum roots. We calculated host‐plant isolation using Euclidean distance (distance‐based dispersal limitation) and resistance distance (functional‐based dispersal limitation), based on host presences. All fungal groups were more influenced by the resistance distance between B. pinnatum than by the Euclidean distance. Fungal dispersal was hence strongly related to the spatial distribution of the host plants. The fungal groups displayed however different responses (in richness, abundance, and composition) to host isolation. Additionally, fungal assemblages were more strongly controlled by the degree of connectivity between host plants during the prior year than by current connectivity. This discrepancy may be due to changes in plant species coverage in a year and/or to the delay of dispersal response of fungi. This study it the first to demonstrate how small‐scale host‐plant distributions mediate connectivity in microorganisms. The consequences of plant distributions for the permeability of the floristic landscape to fungi dispersal appear to control fungal assemblages, but with possibly different mechanisms for the different fungal groups.

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Effect of floristic composition and configuration on plant root mycobiota: a landscape transposition at a small scale

Cited by 13 publications

References 62 publications

Plant neighbours shape fungal assemblages associated with plant roots: A new understanding of niche‐partitioning in plant communities

Plant neighbours shape fungal assemblages associated with plant roots: A new understanding of niche‐partitioning in plant communities

A Landscape of Opportunities for Microbial Ecology Research

The influence of host‐plant connectivity on fungal assemblages in the root microbiota of Brachypodium pinnatum

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