Phylogenetic relationships among host plants explain differences in fungal species richness and community composition in ectomycorrhizal symbiosis

Tedersoo, Leho; Mett, Marit; Ishida, Tomoya; Bahram, Mohammad

doi:10.1111/nph.12328

Cited by 157 publications

(142 citation statements)

References 54 publications

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“…2009; Tedersoo et al. 2013), and has even been proposed as the main determinant of EM fungal community structure (Murata et al. 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Taxonomic relatedness was indeed found to be one of the main factor governing host effect among Salicaceae trees (Tedersoo et al. 2013; Bell et al. 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Other studies also found that host phylogeny explained important proportions of variation in EM communities associated with members of the Salicaceae (Tedersoo et al. 2013; Bell et al. 2014).…”

Section: Discussionmentioning

confidence: 99%

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High richness of ectomycorrhizal fungi and low host specificity in a coastal sand dune ecosystem revealed by network analysis

Roy‐Bolduc

Laliberté

Hijri

2015

Ecology and Evolution

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Ectomycorrhizal (EM) fungi are ubiquitous in temperate and boreal forests, comprising over 20,000 species forming root symbiotic associations with Pinaceae and woody angiosperms. As much as 100 different EM fungal species can coexist and interact with the same tree species, forming complex multispecies networks in soils. The degree of host specificity and structural properties of these interaction networks (e.g., nestedness and modularity) may influence plant and fungal community assembly and species coexistence, yet their structure has been little studied in northern coniferous forests, where trees depend on EM fungi for nutrient acquisition. We used high‐throughput sequencing to characterize the composition and diversity of bulk soil and root‐associated fungal communities in four co‐occurring Pinaceae in a relic foredune plain located at Îles de la Madeleine, Québec, Canada. We found high EM fungal richness across the four hosts, with a total of 200 EM operational taxonomic units (OTUs), mainly belonging to the Agaricomycetes. Network analysis revealed an antinested pattern in both bulk soil and roots EM fungal communities. However, there was no detectable modularity (i.e., subgroups of interacting species) in the interaction networks, indicating a low level of specificity in these EM associations. In addition, there were no differences in EM fungal OTU richness or community structure among the four tree species. Limited shared resources and competitive exclusion typically restrict the number of taxa coexisting within the same niche. As such, our finding of high EM fungal richness and low host specificity highlights the need for further studies to determine the mechanisms enabling such a large number of EM fungal species to coexist locally on the same hosts.

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“…2009; Tedersoo et al. 2013), and has even been proposed as the main determinant of EM fungal community structure (Murata et al. 2013).…”

Section: Discussionmentioning

confidence: 99%

“…Taxonomic relatedness was indeed found to be one of the main factor governing host effect among Salicaceae trees (Tedersoo et al. 2013; Bell et al. 2014).…”

Section: Discussionmentioning

confidence: 99%

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High richness of ectomycorrhizal fungi and low host specificity in a coastal sand dune ecosystem revealed by network analysis

Roy‐Bolduc

Laliberté

Hijri

2015

Ecology and Evolution

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“…2; cf. [74]), the environmental conditions experienced by root-associated fungi might be almost identical between the two host species. Hence, the use of congeneric host plant species in the present study may have precluded the detection of hosts' effects on fungus–fungus interactions.…”

Section: Discussionmentioning

confidence: 99%

Spatial Segregation and Aggregation of Ectomycorrhizal and Root-Endophytic Fungi in the Seedlings of Two Quercus Species

et al. 2014

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Diverse clades of mycorrhizal and endophytic fungi are potentially involved in competitive or facilitative interactions within host-plant roots. We investigated the potential consequences of these ecological interactions on the assembly process of root-associated fungi by examining the co-occurrence of pairs of fungi in host-plant individuals. Based on massively-parallel pyrosequencing, we analyzed the root-associated fungal community composition for each of the 249 Quercus serrata and 188 Quercus glauca seedlings sampled in a warm-temperate secondary forest in Japan. Pairs of fungi that co-occurred more or less often than expected by chance were identified based on randomization tests. The pyrosequencing analysis revealed that not only ectomycorrhizal fungi but also endophytic fungi were common in the root-associated fungal community. Intriguingly, specific pairs of these ectomycorrhizal and endophytic fungi showed spatially aggregated patterns, suggesting the existence of facilitative interactions between fungi in different functional groups. Due to the large number of fungal pairs examined, many of the observed aggregated/segregated patterns with very low P values (e.g., < 0.005) turned non-significant after the application of a multiple comparison method. However, our overall results imply that the community structures of ectomycorrhizal and endophytic fungi could influence each other through interspecific competitive/facilitative interactions in root. To test the potential of host-plants' control of fungus–fungus ecological interactions in roots, we further examined whether the aggregated/segregated patterns could vary depending on the identity of host plant species. Potentially due to the physiological properties shared between the congeneric host plant species, the sign of hosts' control was not detected in the present study. The pyrosequencing-based randomization analyses shown in this study provide a platform of the high-throughput investigation of fungus–fungus interactions in plant root systems.

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“…Host identity was measured as the phylogenetic distance among the seven host genera, computed according to Tedersoo et al, 2013. Plastid matK and trnL gene sequences were downloaded from INSD or generated during our molecular host identification (Supplementary Table S1).…”

Section: Statistical Analysesmentioning

confidence: 99%

Strong effect of climate on ectomycorrhizal fungal composition: evidence from range overlap between two mountains

et al. 2015

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Separating the effects of environmental factors and spatial distance on microbial composition is difficult when these factors covary. We examined the composition of ectomycorrhizal (EM) fungi along elevation gradients on geographically distant mountains to clarify the effect of climate at the regional scale. Soil cores were collected from various forest types along an elevation gradient in southwestern Japan. Fungal species were identified by the internal transcribed spacer regions of the rDNA using direct sequencing. The occurrence of fungal species in this study was compared with a previous study conducted on a mountain separated by B550 km. In total, we recorded 454 EM fungi from 330 of 350 soil cores. Forty-seven fungal species (B20% of the total excluding singletons) were shared between two mountains, mostly between similar forest types on both mountains. Variation partitioning in redundancy analysis revealed that climate explained the largest variance in EM fungal composition. The similarity of forest tree composition, which is usually determined by climatic conditions, was positively correlated with the similarity of the EM fungal composition. However, the lack of large host effects implied that communities of forest trees and EM fungi may be determined independently by climate. Our data provide important insights that host plants and mutualistic fungi may respond to climate change idiosyncratically, potentially altering carbon and nutrient cycles in relation to the plant-fungus associations.

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Phylogenetic relationships among host plants explain differences in fungal species richness and community composition in ectomycorrhizal symbiosis

Cited by 157 publications

References 54 publications

High richness of ectomycorrhizal fungi and low host specificity in a coastal sand dune ecosystem revealed by network analysis

High richness of ectomycorrhizal fungi and low host specificity in a coastal sand dune ecosystem revealed by network analysis

Spatial Segregation and Aggregation of Ectomycorrhizal and Root-Endophytic Fungi in the Seedlings of Two Quercus Species

Strong effect of climate on ectomycorrhizal fungal composition: evidence from range overlap between two mountains

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