Mycorrhizal fungal community composition in seven orchid species inhabiting Song Mountain, Beijing, China

Chen, Yanhong; Gao, Yue; Song, Linli; Zhao, Zeyu; Guo, Shun‐Xing; Xing, Xiaoke

doi:10.1007/s11427-018-9471-x

Cited by 16 publications

(14 citation statements)

References 51 publications

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“…Although there was some overlap in mycorrhizal associations between the studied orchid species, our results indicated that each species associated with a distinctive set of fungi, leading to significant differences in mycorrhizal communities between species. These results are in accordance with previous studies that have compared OM fungal communities between cooccurring orchids (Jacquemyn et al, 2014(Jacquemyn et al, , 2015aChen et al, 2019). However, in contrast to these studies, the differences in mycorrhizal communities were not so pronounced that they turned the network into a set of modules that contained species that interact more strongly among themselves than with species from other modules.…”

Section: Network Architecturesupporting

confidence: 92%

The Architecture of the Network of Orchid–Fungus Interactions in Nine Co-occurring Dendrobium Species

et al. 2020

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Orchid-fungus interaction networks often consist of many different fungi that interact with co-occurring orchids in complex ways, but so far, it remains largely unclear which processes determine network structure, and both ecological and evolutionary mechanisms have been invoked to explain network architecture. In this research, we tested the hypothesis that closely related orchids associate with similar mycorrhizal fungi and vice versa by investigating the architecture of the interaction network between orchid mycorrhizal fungi (OMF) and nine co-occurring epiphytic Dendrobium species. All species grew on the bark of a single tree species (Camelia sinensis) in a traditional tea garden in China, which allowed us to assess the role of evolutionary history in determining the assembly of orchid-fungus communities without the confounding effects of environmental variation. In total, 101 different fungal operational taxonomic units (OTUs) known to be mycorrhizal in orchids were found. Most of the identified mycorrhizal OTUs were members of the Serendipitaceae (80% of all identified mycorrhizal sequences). All orchid species associated with a large number of fungi (average number of links: 31.6 ± 3.8), and orchids from the same species tended to have significantly more similar fungal partners than orchids from different species. The network of interactions was significantly nested (NODF = 41.59, p < 0.01), but not significantly compartmentalized (M = 0.26, M random = 0.27). Phylogenetic analyses showed that the interaction network was not significantly affected by the phylogenies of the orchids or the fungi. Overall, these results indicate that the studied orchid species associated with multiple fungi simultaneously and that the network of associations was built on asymmetric and weak reciprocal dependences. Associating with multiple fungi may be a successful strategy of orchids to colonize vacant sites and to increase survival of established plants in epiphytic habitats.

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Section: Network Architecturesupporting

confidence: 92%

The Architecture of the Network of Orchid–Fungus Interactions in Nine Co-occurring Dendrobium Species

et al. 2020

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“…The occurrence and geographical variation in local abundance of fungal strains can be influenced by local habitat conditions (Pandey, Sharma, Taylor, & Yadon, ) and OMF community composition may therefore be the result of complex interactions between different factors, including extrinsic factors (habitat type, geographical site, soil characteristics, etc.) and intrinsic factors (genetic differentiation, phylogeny of host plants; Chen et al, ; McCormick & Jacquemyn, ; Swarts & Dixon, ; Xing, Ma, Men, Chen, & Guo, ). Previous research has, for example, shown that variation in local environmental factors such as soil moisture content, pH, nutrient conditions (especially soil carbon, nitrogen and phosphorus) can generate pronounced differences in mycorrhizal communities (Bunch, Cowden, Wurzburger, & Shefferson, ; Jacquemyn et al, ).…”

Section: Discussionmentioning

confidence: 99%

Similarity in mycorrhizal communities associating with two widespread terrestrial orchids decays with distance

Xing

Gao

Zhao

et al. 2019

Journal of Biogeography

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Aim Interactions with mycorrhizal fungi are increasingly recognized as an important factor underlying the distribution and abundance of orchid species. However, the geographical distribution of orchid mycorrhizal fungi (OMF) and how their communities vary over large geographical areas are less well understood. Because climatic and environmental similarity may decrease with geographical distance or because some OMF have limited dispersal capabilities, similarities in orchid mycorrhizal communities can be expected to decrease with increasing distances separating orchid populations. However, up till now empirical evidence is largely lacking. Location Eurasia. Taxa Gymnadenia conopsea (L.) R. Brown and Epipactis helleborine (L.) Crantz. Methods High‐throughput sequencing was used to perform a cross‐continental comparison of OMF that associate with two widespread Eurasian terrestrial orchids, Epipactis helleborine and Gymnadenia conopsea. Both phylogenetic and nonphylogenetic measures of community dissimilarity and their components were calculated and related to geographical distances using Mantel tests. Results Our results showed that in both orchid species similarity in mycorrhizal communities decreased significantly with geographical distance. Decomposing the contribution of spatial turnover and nestedness to overall dissimilarity showed that the observed dissimilarity was mainly the result of species replacement between regions, and not of species loss. Similarly, a strong relationship was observed between phylogenetic community dissimilarity and geographical distance. Decomposing PCD values into a nonphylogenetic and phylogenetic component showed that orchid populations located closely next to each other were likely to contain the same operational taxonomic units (OTUs), but that the non‐shared taxa came from different phylogenetic clades. Species indicator analyses showed that the majority of OMF OTUs were restricted to particular geographical areas. However, some OTUs occurred in both continents, indicating that some fungi have very wide distributions. Main conclusions Overall, these results demonstrate that orchid mycorrhizal communities differ substantially across large geographical areas, but that the distribution of orchids is not necessarily restricted by the distribution of particular OMF. Hence, widespread orchid species can be considered mycorrhizal generalists that are flexible in the OMF with which they associate across large geographical areas.

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“…The number of terrestrial, epiphytic, and lithophytic orchid species in the latter study was less than 20, and the phylogenetic diversity focused on fewer orchid genera. No significant phylogenetic signals were consistently detected on either side of the interactions in the binary network formed by seven species of orchids and rhizoctonias belonging to different genera distributed in Song Mountain, Beijing (Chen et al, 2019b). Thus, further research could sample greater numbers of different types of orchids focusing on the broader orchid phylogenetic spectra.…”

Section: Phylogenetic Signals In Orchid-omf Interactionsmentioning

confidence: 96%

“…significantly affect the performance of orchid populations (Stuckey, 1967;Tsiftsis et al, 2012). Interestingly, there is growing evidence supports that coexisting orchid species usually exhibit strongly spatially segregated distribution patterns due to strong clustering within individual species and small overlap between species, and that they are often associated with different OMF communities, which are largely explained by differences in soil moisture and pH (e.g., Jacquemyn et al, 2007Jacquemyn et al, , 2012Jacquemyn et al, , 2014Jacquemyn et al, , 2015aWaud et al, 2017;Chen et al, 2019b;Kaur et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

How Mycorrhizal Associations Influence Orchid Distribution and Population Dynamics

Yang

et al. 2021

Front. Plant Sci.

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Orchid distribution and population dynamics are influenced by a variety of ecological factors and the formation of holobionts, which play key roles in colonization and ecological community construction. Seed germination, seedling establishment, reproduction, and survival of orchid species are strongly dependent on orchid mycorrhizal fungi (OMF), with mycorrhizal cheating increasingly observed in photosynthetic orchids. Therefore, changes in the composition and abundance of OMF can have profound effects on orchid distribution and fitness. Network analysis is an important tool for the study of interactions between plants, microbes, and the environment, because of the insights that it can provide into the interactions and coexistence patterns among species. Here, we provide a comprehensive overview, systematically describing the current research status of the effects of OMF on orchid distribution and dynamics, phylogenetic signals in orchid–OMF interactions, and OMF networks. We argue that orchid–OMF associations exhibit complementary and specific effects that are highly adapted to their environment. Such specificity of associations may affect the niche breadth of orchid species and act as a stabilizing force in plant–microbe coevolution. We postulate that network analysis is required to elucidate the functions of fungal partners beyond their effects on germination and growth. Such studies may lend insight into the microbial ecology of orchids and provide a scientific basis for the protection of orchids under natural conditions in an efficient and cost-effective manner.

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Mycorrhizal fungal community composition in seven orchid species inhabiting Song Mountain, Beijing, China

Cited by 16 publications

References 51 publications

The Architecture of the Network of Orchid–Fungus Interactions in Nine Co-occurring Dendrobium Species

The Architecture of the Network of Orchid–Fungus Interactions in Nine Co-occurring Dendrobium Species

Similarity in mycorrhizal communities associating with two widespread terrestrial orchids decays with distance

How Mycorrhizal Associations Influence Orchid Distribution and Population Dynamics

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