The slippery nature of ectomycorrhizal host specificity: Suillus fungi associated with novel pinoid (Picea) and abietoid (Abies) hosts

Pérez-Pazos, Eduardo; Certano, Amanda K.; Gagne, Joe; Lebeuf, Renée; Siegel, Noah; Nguyen, Nhu; Kennedy, Peter G.

doi:10.1080/00275514.2021.1921525

Cited by 8 publications

(13 citation statements)

References 31 publications

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“…Yet, there are new reports of various Suillus species sporocarps from forests in which their Pinaceae hosts are absent. In bioassays, Suillus was found to form mycorrhiza with Abies and Tsuga that belong to the abietoid clade of Pinaceae, indicating that Suillus host specificity is more flexible than previously thought (Pérez‐Pazos et al, 2021). Here, Suillus collinitus was indeed most abundant on Pinus saplings, yet we found it on roots of all species.…”

Section: Discussionmentioning

confidence: 86%

“…However, root grafts occur mostly between trees of the same species (Fraser et al, 2006; Graham & Bormann, 1966; Woods & Brock, 1964) and therefore it does not provide a good explanation for carbon transfer between trees of different taxa. Another possible explanation is that carbon of one tree is secreted to the soil and is being absorbed by a root of a different tree (Pérez‐Pazos et al, 2021). A third possibility is that trees exchange carbon through mycorrhizal networks (Fitter et al, 1998; Francis & Read, 1984; Högberg et al, 2008; Simard, et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Asymmetric belowground carbon transfer in a diverse tree community

et al. 2022

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Roots of vascular plants interact with mycorrhizal fungi along withother components of the soil microbiome including nonmycorrhizal fungi, archaea, and bacteria (Högberg et al., 2008). The symbiotic interaction between the fungus and the root relies on transmission of soil-derived nutrients from the fungus to the host tree (Collins Johnson et al., 2010), increasing root absorption of water by the fungal hyphae and mediating the interaction of the root with other microbes in the soil (Aroca et al., 2007;Hestrin et al., 2019). The heterotrophic fungus benefits from the interaction by receiving carbon from the autotrophic host tree (Högberg et al., 2008). There are two main functional groups of mycorrhizae: ectomycorrhiza (EM) which do not penetrate the root cortex of the host and interact mainly with trees that are located in seasonally cold and dry climates, and arbuscular mycorrhiza (AM) whose hyphae penetrate the root cortex and interact mainly with plants that are located in seasonally warm and wet climates (Steidinger et al., 2019). Each individual tree may

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Asymmetric belowground carbon transfer in a diverse tree community

et al. 2022

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“…An ecological difference can serve as a taxonomic character to distinguish novel species. Although the host preference/specificity of mycorrhizal fungi is complex and needs both field surveys and in vitro mycorrhizal synthesis assays using mycelia and basidiospores to evaluate accurately ( Lofgren et al, 2018 ; Pérez-Pazos et al, 2021 ), our observations and molecular analyses of mycorrhizae demonstrated that S. flavorhizomorphae prefers pines whereas S. chloroporum prefers broadleaved trees in Betulaceae ( Carpinus ) and Fagaceae ( Castanopsis and Quercus ). This suggests that different species in this genus have different host preferences.…”

Section: Discussionmentioning

confidence: 85%

Two new species of Sistotrema s.l. (Cantharellales) from Japan with descriptions of their ectomycorrhizae

et al. 2022

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We describe two new species of resupinate Sistotrema sensu lato ( Cantharellales ) collected in Japan: S. flavorhizomorphae and S. chloroporum . Both species have urniform basidia with more than four sterigmata and monomitic hyphal system, oil-rich hyphae in subiculum, which is typical for this genus. Sistotrema chloroporum is characterized by poroid hymenophore partly yellowish-green, basidia 4-6-spored, medium-sized basidiospores (4.5-6.5 × 3.5-6 µm), and broadleaf forest habitat. Sistotrema flavorhizomorphae is characterized by hydnoid-irpicoid hymenophore, bright yellowish rhizomorphs, basidia 6-8-spored, small basidiospores (3-3.5 × 2.5-3 µm), and pine forest habitat. Phylogenetic trees inferred from the fungal nrDNA ITS and LSU and the rpb2 sequences supported that both species were distinct and grouped with other ectomycorrhizal Sistotrema and Hydnum species, but their generic boundary was unclear. Mycorrhizae underneath basidiomes of both species were identified and described via molecular techniques. Mycorrhizae of S. chloroporum have similar characteristics to those of other Sistotrema s.l. and Hydnum species, i.e., S. confluens and H. repandum , whereas S. flavorhizomorphae has a distinct morpho-anatomy, for example, a distinct pseudoparenchymatous mantle. Comprehensive characterizations of basidiomes and mycorrhizae improve the taxonomic analysis of mycorrhizal species of Sistotrema s.l.

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“…In natural environments, Suillus typically associates with three of the four subfamilies of the Pinaceae (Pinoideae, Laricoieae, and Piceoideae), allowing researchers to study host–symbiont associations across different taxonomic levels, including among host genera, subgenera, and species. Suillus also facilitates the study of host switching (Lofgren et al ., 2021; Zhang et al ., 2022), both between typical hosts and outside of these host groups, thanks to several species that defy the canonical partner specificity patterns demonstrated by most species (Lofgren et al ., 2018; Pérez‐Pazos et al ., 2021).…”

Section: Suillus As a Model Genusmentioning

confidence: 99%

“…Conversely, the /placidus clade contains a group of species ( S. placidus , S. subalpinus , S. anomalus , and S. punctatipes ) which, although morphologically distinct, are not (yet) supported as a monophyletic group (Nguyen et al ., 2016b). Among these clades are species such as S. punctatipes , which has the ability to associate with alternative hosts such as Picea and Abies (Pérez‐Pazos et al ., 2021), although it should be noted that species outside of these clades such as S. glandulosus and S. subaureus also have the ability to associate with alternative hosts. The active evolution within (and outside of) these species complexes provides novel information that can be leveraged to understand the molecular and evolutionary mechanisms of host association and host‐switching among plant‐associated fungi.…”

Section: Taxonomy and Evolutionmentioning

confidence: 99%

Suillus: an emerging model for the study of ectomycorrhizal ecology and evolution

Lofgren,

Nguyen,

Kennedy

et al. 2024

New Phytologist

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SummaryResearch on mycorrhizal symbiosis has been slowed by a lack of established study systems. To address this challenge, we have been developing Suillus, a widespread ecologically and economically relevant fungal genus primarily associated with the plant family Pinaceae, into a model system for studying ectomycorrhizal (ECM) associations. Over the last decade, we have compiled extensive genomic resources, culture libraries, a phenotype database, and protocols for manipulating Suillus fungi with and without their tree partners. Our efforts have already resulted in a large number of publicly available genomes, transcriptomes, and respective annotations, as well as advances in our understanding of mycorrhizal partner specificity and host communication, fungal and plant nutrition, environmental adaptation, soil nutrient cycling, interspecific competition, and biological invasions. Here, we highlight the most significant recent findings enabled by Suillus, present a suite of protocols for working with the genus, and discuss how Suillus is emerging as an important model to elucidate the ecology and evolution of ECM interactions.

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The slippery nature of ectomycorrhizal host specificity: Suillus fungi associated with novel pinoid (Picea) and abietoid (Abies) hosts

Cited by 8 publications

References 31 publications

Asymmetric belowground carbon transfer in a diverse tree community

Asymmetric belowground carbon transfer in a diverse tree community

Two new species of <i>Sistotrema</i> s.l. (<i>Cantharellales</i>) from Japan with descriptions of their ectomycorrhizae

Suillus: an emerging model for the study of ectomycorrhizal ecology and evolution

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