Phylogenetic and functional traits of ectomycorrhizal assemblages in top soil from different biogeographic regions and forest types

Pena, Rodica; Lang, Christa; Lohaus, Gertrud; Boch, Steffen; Schall, Peter; Schöning, Ingo; Ammer, Christian; Fischer, Markus; Polle, Andrea

doi:10.1007/s00572-016-0742-z

Cited by 41 publications

(57 citation statements)

References 65 publications

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“…This result was expected because the root tips of temperate forest trees are usually highly colonized with mycelium (Kubisch, Hertel, & Leuschner, 2015;Lang et al, 2011;Pena et al, 2010), forming specific ectomycorrhizal morphotypes as a visible signature of functional symbiosis (Agerer, 1987). The diversity of fungi engaged in functional symbiosis is, however, lower (10-15 species per forest plot in NE, CT and SW, Pena et al, 2017) than that present in the RAMs (47-60 mycorrhizal OTUs per plot, this study). This finding is also in agreement with previous studies that showed that mycorrhizal mycobiomes consist of active symbionts and a cryptic "reserve," whose members are recruited during temporal turnover of the assemblages (Danielsen et al, 2012(Danielsen et al, , 2013 , 2008).…”

Section: The Dominance Of Mycorrhizal Fungi In Rams Of Fagaceae Andcontrasting

confidence: 70%

“…We could not detect any distinct patterns in the communities of pathotrophic fungi, and therefore, we suggest that they occurred randomly. As no indications for a visible root injury were reported in our study regions (Pena et al, 2017), we speculate that the pathogens were subjected to natural biological pest control in temperate forests managed according to near-natural conditions without fertilizer, herbicide or fungicide application (Boncina, 2011;Brunet, Fritz, & Richnau, 2010).…”

Section: Taxonomic and Functional Structures Of Root-associated Mycmentioning

confidence: 68%

“…However, these factors have less impact on root‐associated than on soil‐localized mycorrhizal fungi (Goldmann et al., ). In managed forests, silvicultural measures, especially the selection of tree species, influence mycorrhizal associations because of fungal host preferences (Lang, Seven, & Polle, ; Pena et al., ) and also because tree species‐specific traits influence habitat properties (Bahnmann et al., ; Põlme et al., ; Urbanová, Šnajdr, & Baldrian, ). However, at larger biogeographic scales of temperate forest ecosystems, the consequences of forest management on the taxonomic and trophic structure of RAMs are unknown.…”

Section: Introductionmentioning

confidence: 99%

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Assembly processes of trophic guilds in the root mycobiome of temperate forests

et al. 2018

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Root‐associated mycobiomes (RAMs) link plant and soil ecological processes, thereby supporting ecosystem functions. Understanding the forces that govern the assembly of RAMs is key to sustainable ecosystem management. Here, we dissected RAMs according to functional guilds and combined phylogenetic and multivariate analyses to distinguish and quantify the forces driving RAM assembly processes. Across large biogeographic scales (>1,000 km) in temperate forests (>100 plots), RAMs were taxonomically highly distinct but composed of a stable trophic structure encompassing symbiotrophic, ectomycorrhizal (55%), saprotrophic (7%), endotrophic (3%) and pathotrophic fungi (<1%). Taxonomic community composition of RAMs is explained by abiotic factors, forest management intensity, dominant tree family (Fagaceae, Pinaceae) and root resource traits. Local RAM assemblies are phylogenetically clustered, indicating stronger habitat filtering on roots in dry, acid soils and in conifer stands than in other forest types. The local assembly of ectomycorrhizal communities is driven by forest management intensity. At larger scales, root resource traits and soil pH shift the assembly process of ectomycorrhizal fungi from deterministic to neutral. Neutral or weak deterministic assembly processes are prevalent in saprotrophic and endophytic guilds. The remarkable consistency of the trophic composition of the RAMs suggests that temperate forests attract fungal assemblages that afford functional resilience under the current range of climatic and edaphic conditions. At local scales, the filtering processes that structure symbiotrophic assemblies can be influenced by forest management and tree selection, but at larger scales, environmental cues and host resource traits are the most prevalent forces.

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Section: The Dominance Of Mycorrhizal Fungi In Rams Of Fagaceae Andcontrasting

confidence: 70%

Section: Taxonomic and Functional Structures Of Root-associated Mycmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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Assembly processes of trophic guilds in the root mycobiome of temperate forests

et al. 2018

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“…For example, considerable differences among taxa of EM fungi have been shown in terms of nutrient acquisition [18,19] and other functions, such as C costs for maintenance respiration [20]. Moreover, functional differences of EM taxa that follow different strategies by means of development and differentiation of their external mycelium are evident [21,22], such as differences in which form of N is preferentially taken up [23,24], and the rate at which the hyphal mass decomposes [25]. Classification into different exploration types is a widely used parameter to assess functional diversity of EM taxa, as it is also relevant for ecosystem functioning [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Patterns in Ectomycorrhizal Diversity, Community Composition, and Exploration Types in European Beech, Pine, and Spruce Forests

Rosinger

Sandén

Matthews

et al. 2018

Forests

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Ectomycorrhizal (EM) fungi are pivotal drivers of ecosystem functioning in temperate and boreal forests. They constitute an important pathway for plant-derived carbon into the soil and facilitate nitrogen and phosphorus acquisition. However, the mechanisms that drive ectomycorrhizal diversity and community composition are still subject to discussion. We investigated patterns in ectomycorrhizal diversity, community composition, and exploration types on root tips in Fagus sylvatica,Picea abies, and Pinus sylvestris stands across Europe. Host tree species is the most important factor shaping the ectomycorrhizal community as well as the distribution of exploration types. Moreover, abiotic factors such as soil properties, N deposition, temperature, and precipitation, were found to significantly influence EM diversity and community composition. A clear differentiation into functional traits by means of exploration types was shown for all ectomycorrhizal communities across the three analyzed tree species. Contact and short-distance exploration types were clearly significantly more abundant than cord- or rhizomorph-forming long-distance exploration types of EM fungi. Medium-distance exploration types were significantly lower in abundance than contact and short-distance types, however they were the most frequent EM taxa and constituted nearly half of the EM community. Furthermore, EM taxa exhibit distinct ecological ranges, and the type of soil exploration seemed to determine whether EM taxa have small or rather big environmental ranges.

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“…, Pena et al. ), it may also have reduced the need for and expression of functional complementarity between fungi and plants in terms of nutrient foraging. Nevertheless, our results do suggest that root diameter is one of many possible factors that influence the traits of EM fungal communities.…”

Section: Discussionmentioning

confidence: 99%

Root diameter predicts the extramatrical hyphal exploration distance of the ectomycorrhizal fungal community

Chen

Eissenstat

2018

Ecosphere

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Abstract. Locally coexisting tree species of temperate forests often vary widely in the diameter of their absorptive roots, resulting in contrasting strategies of root foraging within soil nutrient hot spots. We hypothesized that root diameter would also influence the extramatrical hyphal exploration distance of the mycorrhizal fungal community due to coevolution of the plant and fungal partners leading to functional complementarity. We collected absorptive roots from mature trees of nine ectomycorrhizal tree species in replicated monoculture plots of a plantation where the soil is relatively homogeneous. The identities of ectomycorrhizal fungal taxa and their relative abundances were determined by DNA sequencing. The hyphal exploration type (i.e., contact, short-distance, medium-distance or long-distance) was assigned to each taxon, allowing us to calculate an index of the abundance-weighted mean extramatrical hyphal exploration distance of the fungal community. Overall, there was a significant, positive correlation between root diameter and our index of hyphal exploration distance such that tree species with the thicker roots were associated with fungi with the longer hyphal exploration distance. Moreover, we found that root diameter negatively correlated with the proportion of contact ectomycorrhizal fungal taxa and positively correlated with the proportion of medium-distance ectomycorrhizal fungal taxa. Our results suggest that among temperate ectomycorrhizal tree species, root diameter selects for communities of mycorrhizal fungi of specific exploration distance in a way that is consistent with root-fungal functional complementarity in nutrient foraging.

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Phylogenetic and functional traits of ectomycorrhizal assemblages in top soil from different biogeographic regions and forest types

Cited by 41 publications

References 65 publications

Assembly processes of trophic guilds in the root mycobiome of temperate forests

Assembly processes of trophic guilds in the root mycobiome of temperate forests

Patterns in Ectomycorrhizal Diversity, Community Composition, and Exploration Types in European Beech, Pine, and Spruce Forests

Root diameter predicts the extramatrical hyphal exploration distance of the ectomycorrhizal fungal community

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