Biogeography and Ecology of Tulasnellaceae

Oberwinkler, Franz; Cruz, Darío; Suárez, Juan Pablo

doi:10.1007/978-3-319-56363-3_12

Cited by 21 publications

(9 citation statements)

References 202 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Many photosynthetic orchid species are capable of extracting fungal energy as adults, a condition referred to as partial mycoheterotrophy (Gebauer, Preiss, & Gebauer, 2016;Selosse, Charpin, & Not, 2017), and some species have evolved to utilize fungal carbon exclusively (Selosse, Bocayuva, Kasuya, & Courty, 2016;Selosse et al, 2017). These fungi are generally thought to act as saprotrophs in forest environments (Rasmussen, 1995;Roberts, 1999), although Tulasnella asymmetrica is a fungus known to be facultatively ectomycorrhizal and exploited by mycoheterotrophic liverworts, as well (Bidartondo, Bruns, Weiß, Sérgio, & Read, 2003;Oberwinkler, Cruz, & Suárez, 2017). Thus, the choice of fungus may relate to the ability of the plant to extract carbohydrate resources from the fungus, although little research exists to corroborate this hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Does evolutionary history determine specificity in broad ecological interactions?

et al. 2019

View full text Add to dashboard Cite

Most species engage in broad interactions, in which they interact with multiple partner species. The evolutionary processes that generate such generalized interactions remain unknown, partly due to the difficulty in comparing their breadth. We argue that the interaction specificity of species involved in broad interactions evolves in three ways: (a) assemblage specialization, in which a species specializes on particular host species that contribute unique resources, yielding specialization on the entire host assemblage; (b) apparent generalism, in which a species specializes on one or few host species that contribute unique resources, but also associates with other host species that contribute functionally redundant resources; and (c) true generalism, in which a species associates with multiple hosts that overlap functionally, and that are geographically interchangeable based on opportunity for encounter, leading to frequent host switching. We performed a phylogenetically controlled analysis of data on mycorrhizal fungal associations for approximately 25% of the orchid subfamily Cypripedioideae to determine whether these plants have specialized on their mycorrhizal fungal communities, or whether they are true generalists. We also assessed the impact of environmental factors on these associations. Our results suggested strong support for apparent generalism, suggesting strong specialization on particular, dominant fungi and weak specialization on others. Large orchid clades associated with dominant fungal species, notably Tulasnella cystidiophora for genus Cypripedium, and T. cystidiophora and T. calospora for genus Paphiopedilum. Significant phylogenetic signal in fungal species richness per plant species, but not in the fungal phylogenetic diversity per plant species nor in the composition of fungal assemblages across orchid species suggested that plant phylogeny is an important determinant of fungal association. Mixed linear models showed that environment influenced specificity across plant species, and that observed differences were strongly driven by differences in sampling effort. Synthesis. We found evidence of specialization of plant species on dominant fungal species, and to a lesser extent on their close relatives. The strong dominance of particular fungal species in these associations suggests important ecological roles for them, while environmental gradients in specificity suggest strong environmental filtering of these interactions.

show abstract

Section: Discussionmentioning

confidence: 99%

Does evolutionary history determine specificity in broad ecological interactions?

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In accordance with previous studies performed in tropical areas ( Kottke et al, 2010 ; Cevallos et al, 2017 ), the present results revealed that epiphytic orchids were associated with a highly diverse group of mycorrhizal fungi (represented by 83 OTUs), comprising members of Tulasnellaceae, Ceratobasidiaceae, Serendipitaceae and Atractiellales. Members of Tulasnellaceae appear to be globally distributed, as they have been frequently reported in association with epiphytic orchids in many forests ( Martos et al, 2012 ; Riofrío et al, 2013 ; Suárez et al, 2016 ; Oberwinkler et al, 2017 ). Consistently, in the present study the dominant fungal group associated with C. retusum and E. macrum was Tulasnellaceae, representing 41% of the entire mycorrhizal fungi identified.…”

Section: Discussionmentioning

confidence: 99%

In situ Orchid Seedling-Trap Experiment Shows Few Keystone and Many Randomly Associated Mycorrhizal Fungal Species During Early Plant Colonization

2018

Self Cite

View full text Add to dashboard Cite

Orchids are known for their vast diversity and dependency on mycorrhizal fungi. Under in situ conditions, the biotic and abiotic factors determining the composition and distribution of orchid mycorrhizal fungi (OMF) communities remain largely unexplored. Therefore in situ experiments are needed to better understand the interactions between orchids and fungi. A seedling-trap experiment was conducted in the Reserva Biológica San Francisco, a well-known biodiversity hotspot located in the Andes of southern Ecuador. The objective was to investigate the effect of orchid species, site, elevation or temporal variation on the assembly and structure of OMF associated with Cyrtochilum retusum and Epidendrum macrum. The OMF community composition was determined using the Illumina MiSeq sequencing of the internal transcribed spacer 2 (ITS2) region. The results exhibited 83 OMF operational taxonomic units belonging to Tulasnellaceae, Ceratobasidiaceae, Serendipitaceae and Atractiellales. It was observed that the composition of the OMF communities was different among orchid species and temporal variation but was not different among sites. The results further support that orchids have a core of keystone OMF that are ubiquitously distributed and stable across temporal change, whereas the majority of these fungi are randomly associated with the plants.

show abstract

“…Tulasnellales seems to be the main order associated with terrestrial orchids (Ogura-Tsujita et al 2012). They are often fungal associates of several orchids and live in the photosynthetic roots of some epiphytic orchids or in the underground organs of terrestrial orchids (Jacquemyn et al 2017;Oberwinkler et al 2017).…”

Section: Mycorrhizal Fungi Associated With Chilean Orchidsmentioning

confidence: 99%

Orchid Mycorrhizal Interactions on the Pacific Side of the Andes from Chile. A Review

Herrera

García-Romera

Meneses

et al. 2019

J Soil Sci Plant Nutr

View full text Add to dashboard Cite

In order to confront the constant decline in global biological diversity, amelioration strategies are needed for threatened species to design reintroduction policies, particularly in plants with critical reproduction steps, such as orchids. Orchids are part of a highly diverse plant family, with several species under imminent extinction risk. This is the case of Chilean Orchidaceae, which has shown a constant decay in their populations due to an increase in the alteration processes of their natural distribution habitats. Successful orchid reintroductions require a full understanding of orchid mycorrhizal fungi and their dynamic according to different developmental stages and environmental conditions because orchid seeds need mycorrhizal fungi to obtain nutritional compounds at early developmental stages. This article performed a critical literature review of the ecological studies conducted on Chilean orchids and their relationships with mycorrhizal fungi in order to focus on the best scientific approach to achieve successful restoration programs involving orchid seeds and compatible mycorrhizal fungi.

show abstract

Biogeography and Ecology of Tulasnellaceae

Cited by 21 publications

References 202 publications

Does evolutionary history determine specificity in broad ecological interactions?

Does evolutionary history determine specificity in broad ecological interactions?

In situ Orchid Seedling-Trap Experiment Shows Few Keystone and Many Randomly Associated Mycorrhizal Fungal Species During Early Plant Colonization

Orchid Mycorrhizal Interactions on the Pacific Side of the Andes from Chile. A Review

Contact Info

Product

Resources

About