Juan Pablo Suárez

Juan Pablo Suárez
Universidad Técnica Particular de Loja | UTPL · Departamento de Ciencias Biológicas

Ph.D.

About

166
Publications
21,363
Reads
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1,262
Citations
Citations since 2016
37 Research Items
909 Citations
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2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Mycorrhiza, orchid mycorrhiza, Tulasnella, tropical mountain rain forest, Molecular Phylogenetics, building scientific capacity Ecuador

Publications

Publications (166)
Article
Full-text available
In epiphytic orchids, distinctive groups of fungi are involved in the symbiotic association. However, little is known about the factors that determine the mycorrhizal community structure. Here, we analyzed the orchid mycorrhizal fungi communities associated with three sympatric Cymbidieae epiphytic tropical orchids (Cyrtochilum flexuosum, Cyrtochil...
Article
Full-text available
Root associated fungal (RAF) communities can exert strong effects on plant communities and are potentially sensitive to shifts in soil fertility. As increased atmospheric nitrogen (N) and phosphorus (P) deposition can alter the nutrient balance in natural ecosystems, we assessed the response of RAF communities to a fertilization experiment deployed...
Article
Full-text available
In natural environments, it has been shown that orchids interact with multiple microorganisms including various species of fungi that colonize their tissues. The diversity of these fungi associated with orchid roots is still being described along with the ecological role they play when interacting with the orchids. In this study, we evaluated the r...
Article
Full-text available
Biodiversity and ecosystem functions are highly threatened by global change. It has been proposed that geodiversity can be used as an easy-to-measure surrogate of biodiversity to guide conservation management. However, so far, there is mixed evidence to what extent geodiversity can predict biodiversity and ecosystem functions at the regional scale...
Preprint
Full-text available
Andean forests are biodiversity hotspots and globally important carbon (C) repositories. This status might be at risk due to increasing rates of atmospheric nutrient deposition. As fungal communities are key in the recirculation of soil nutrients, assessing their responses to soil eutrophication can help establish a link between microbial biodivers...
Article
Full-text available
Tropical dry forests are an intricate ecosystem with special adaptations to periods of drought. Arbuscular mycorrhizal fungi (AMF) are essential for plant survival in all terrestrial ecosystems but might be of even greater importance in dry forests as plant growth is limited due to nutrient and water deficiency during the dry season. Tropical dry f...
Article
Full-text available
Tropical mountain ecosystems are threatened by climate and land-use changes. Their diversity and complexity make projections how they respond to environmental changes challenging. A suitable way are trait-based approaches, by distinguishing between response traits that determine the resistance of species to environmental changes and effect traits t...
Chapter
Except for three members of Nyctaginaceae in the lower montane forest (2000 masl) all investigated trees were arbuscular mycorrhizal. There are many rare AM fungi and only a few more common AM fungi. Each tree individual has an individual composition of AM fungal partners, which usually consist of one (two) common fungi and 3–8 rarely occurring fun...
Article
Full-text available
Anthropogenic atmospheric deposition can increase nutrient supply in the most remote ecosystems, potentially affecting soil biodiversity. Arbuscular mycorrhizal fungal (AMF) communities rapidly respond to simulated soil eutrophication in tropical forests. Yet the limited spatio‐temporal extent of such manipulations, together with the often unrealis...
Article
The community structure of arbuscular mycorrhizal fungi (AMF) is wide in terms of composition and distribution and can be influenced by the host plant. The aim of this research was to compare the diversity of AMF communities associated with cultivated (Solanum betaceum) and wild tree tomato (Solanum cajanumensis) species. Roots of both species were...
Article
Full-text available
Arbuscular mycorrhizal fungi (AMF) are the most prominent mycobionts of plants in the tropics, yet little is known about their diversity, species compositions and factors driving AMF distribution patterns. To investigate whether elevation and associated vegetation type affect species composition, we sampled 646 mycorrhizal samples in locations betw...
Article
Full-text available
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...
Article
Full-text available
In orchids, most of the root-associated fungal endophytes remain undescribed as well as the drivers that affect their interactions with the plants. We characterized root-associated fungal endophytes of co-existing orchids across sites in two areas of montane rainforest in the southern Ecuadorian Andes. We amplified the nrDNA ITS2 region of 130 orch...
Article
Though typically discussed in the context of salinity, a shortage of sodium in tropical forests has been demonstrated in recent years, inhibiting soil biota with impacts on decomposition processes (Sodium Ecosystem Respiration hypothesis). So far, sodium limitation has been shown for soil fauna, whereas a potential role in saprotrophic fungi remain...
Article
Full-text available
A present challenge in today's sustainable development efforts is to empower interoperability between variables and indicators across autonomous, distributed and heterogeneous information systems, and data service providers. Restricted access to data sources and services limits the capabilities of a smart and sustainable territory to improve social...
Article
We examined the bacterial community associated with an orchid mycorrhizal fungus from the Neotropical region. Living hyphae of Serendipita sp., isolated from roots of Stanhopea connata, were screened using molecular tools to identify associated prokaryotes. In total, nine distinctive bacterial OTUs were detected belonging to phyla Firmicutes, Prote...
Conference Paper
Full-text available
A crucial issue in the development of smart sustainable cities and territories is the use of standards and approach’s to ensure interoperability – so that equipment and systems produced by different vendors work together seamlessly – and to reduce costs through economies of scale. In this work, we investigate the core challenges faced when consumin...
Article
Biotic interactions play an important role in the assembly and stability of communities. All orchids depend on mycobionts for early establishment, but whether individual orchid species depend on a specific or broad spectrum of mycobionts is still a matter of debate. Tulasnellaceae (Basidiomycota) is the richest and most widespread mycobiont worldwi...
Article
Knowledge of fungal root-associates is essential for effective conservation of tropical epiphytic orchids. We investigated the diversity of root-associated fungi of Cyrtochilum myanthum, Scaphyglottis punctulata and Stelis superbiens from a tropical mountain rainforest in southern Ecuador, using a culture dependent approach. We identified 115 funga...
Article
Full-text available
A field trial was conducted in two localities of the Ecuadorian Andes to evaluate potato (Solanum tuberosum c.v. INIAP - Fripapa) response to inoculation with four commercial products containing the arbuscular mycorrhizal fungus (AMF) strain Rhizophagus irregularis DAOM 197198. In parallel, potato roots were analysed using 454 GS-FLX+ sequencing of...
Article
Full-text available
La lombriz de tierra, Eisenia foetida, es hospedero de numerosos microorganismos simbiontes, muchos de los cuales han sido identificados recientemente, así como se ha descrito su actividad enzimática. Estos microorganismos suelen presentar actividad enzimática de diferente tipo. Algunos podrían presentar interés industrial por sus potenciales aplic...
Conference Paper
Durante siglos el cultivo de papa ha jugado un papel fundamental en la nutrición de los habitantes de la cordillera Andina ocupando aún hoy un lugar central en la economía de pequeños y medianos agricultores en la Sierra del Ecuador. El uso de agroquímicos en la papa es el medio más eficiente para incrementar el rendimiento agrícola y para el contr...
Chapter
Full-text available
Species of Tulasnellaceae share the unique feature of tulasnelloid basidia, characterised by swollen sterigmata. All species have a resupinate inconspicuous or lacking basidiomata. Only three genera are assigned to the family, two of them being monospecific. Here, we treat the species of the genus Tulasnella phylogenetically, ecologically, and biog...
Chapter
Full-text available
Interactions between people, cities and territories are the centre of attention nowadays. Inspired by advances in the concept of smart cities, the authors present an initiative for the intelligent manage- ment of highly biodiverse territories, SmartLand. The initiative is promoted by Universidad Técnica Particular de Loja (Ecuador) and is committed...
Article
Full-text available
Aims: This study aimed at evaluating the impact of seven plant growth-promoting rhizobacteria (PGPR) on root colonization and life cycle of Rhizophagus irregularis MUCL 41833 when co-entrapped in alginate beads. Methods and results: Two in vitro experiments were conducted. The first consisted in the immobilization of R. irregularis and seven PGP...
Article
Full-text available
Orchids are a main component of the diversity of vascular plants in Ecuador with approximately 4000 species representing about 5.3% of the orchid species described worldwide. More than a third of these species are endemics. As orchids, in contrast to other plants, depend on mycorrhizal fungi already for seed germination and early seedling establish...
Article
Full-text available
The orchid genus Teagueia Luer (Orchidaceae, subtribe Pleurothallidinae) presents an extraordinary example of recent local evolutionary radiation. In principle, mutualisms might affect the origin of plant species via an effect on speciation. As orchids depend on mycorrhizal fungi for seed germination and early plantlet development we tested whether...
Article
Due to ambiguous morphological and molecular characteristics, species of Tulasnellaceae are difficult to organize taxonomically. In this study a morphological revision of the family and 30 reinvestigated morphospecies of Tulasnella are presented. Illustrations, descriptions, statistical analysis, and discussions of the species are based on exsiccat...
Article
Full-text available
Tropical ecosystems have an important role in global change scenarios, in part because they serve as a large terrestrial carbon pool. Carbon protection is mediated by soil aggregation processes, whereby biotic and abiotic factors influence the formation and stability of aggregates. Nutrient additions may affect soil structure indirectly by simultan...
Article
Studies in temperate systems provide evidence that the abundance of arbuscular mycorrhizal fungal (AMF) depends on soil nutrient availability, which is mainly explained in the context of resource stoichiometry and differential plant biomass allocation. We applied this concept to an understudied ecosystem - tropical montane forest - analyzing root a...
Research
Full-text available
New species of Tulasnella and new records for Ecuador. https://www.schweizerbart.de/papers/nova_hedwigia/detail/102/85679/Morphological_revision_of_Tulasnellaceae_with_two_new_species_of_Tulasnella_and_new_records_of_Tulasnella_spp_for_Ecuador
Article
Full-text available
Non-targeted ¹H-NMR methods were used to determine metabolite profiles from crude extracts of Alpine and Ecuadorian lichens collected from their natural habitats. In control experiments, the robustness of metabolite detection and quantification was estimated using replicate measurements of Stereocaulon alpinum extracts. The deviations in the overal...
Article
Full-text available
Food security (a pressing issue for all nations) faces a threat due to population growth, land availability for growing crops, a changing climate (leading to increases in both abiotic and biotic stresses), heightened consumer awareness of the risks related to the use of agrichemicals, and also the reliance on depleting fossil fuel reserves for thei...
Article
Full-text available
Colonization of plant rhizosphere/roots by beneficial microorganisms (e.g. plant growth promoting rhizobacteria - PGPR, arbuscular mycorrhizal fungi - AMF) confers broad-spectrum resistance to virulent pathogens and is known as induced systemic resistance (ISR) and mycorrhizal-induced resistance (MIR). ISR or MIR, an indirect mechanism for biocontr...
Poster
Full-text available
Global food insecurity is probably one of the main threats facing humankind today. Agricultural practices will continue to change over the next number of decades to take into account the demands of an ever increasing human population (9 billion by 2050), changes in global climate, depletion of natural resources and in Europe, an ever decreasing lis...
Poster
Full-text available
The most pressing issues facing the human race today is that of global food security, ever more vulnerable in the wake of major disturbances e.g climate change. Agricultural practices, globally, have to become more sustainable. Legislative changes in relation to the control and use of agrichemicals (especially in Europe) are dictating a more integr...
Article
Full-text available
Delimitation of species and the search for a proper threshold for defining phylogenetic species in fungi are under discussion. In this study, morphological and molecular data are correlated to delimit species of Tulasnella, the most important mycobionts of Orchidaceae, which suffer from poor taxonomy. Resupinate basidiomata of Tulasnella species we...
Article
Full-text available
The presence of compatible fungi is necessary for epiphytic orchid recruitment. Thus, identifying associated mycorrhizal fungi at the population level is essential for orchid conservation. Recruitment patterns may also be conditioned by factors such as seed dispersal range and specific environmental characteristics. In a forest plot, all trees with...
Chapter
Full-text available
To better understand the mechanisms behind maintenance of the extraordinary plant and fungal diversity in tropical mountain forests we applied, for the first time, network theory to investigate the mycobiont-plant communities. We addressed three different mycorrhizal classes, arbuscular mycorrhizae of tropical trees, mycorrhizae of terrestrial and...
Article
Full-text available
Arbuscular mycorrhizae are important for growth and survival of tropical trees. We studied the community of arbuscular mycorrhizal fungi in a tropical mountain rain forest and in neighbouring reforestation plots in the area of Reserva Biológica San Francisco (South Ecuador). The arbuscular mycorrhizal fungi were analysed with molecular methods sequ...
Data
Modules of plant-AMF relationships in a nested network (99% similarity cut-off). Numbers indicate module ID and percentages give the number of within-links in comparison to among-links. The higher the percentage, the more isolated is the module. All modules, with the exception of module 13, are embedded in the overall network, which is indicated by...
Data
List of all sequences with OTU numbers for the 97% similarity cut-off and the 99% similarity cut-off as well as Genbank accession number, associated plant species (numbered if there are several sampled individuals), site, order of Glomeromycota and labelling in Fig.S1. (XLS)
Data
Rarefaction curves for AMF OTUs. Rarefaction curves of the different data sets (a–j) did not reach a stable state. (Sobs = species observed, LB = lower bound, UB = upper bound). a) Samples of pristine forest and reforestation plots, 97% similarity cut-off; b) Samples of pristine forest and reforestation plots, 99% similarity cut-off; c) Samples of...
Data
AMF OTU composition for individual Cedrela seedlings. (XLS)
Data
Detailed information of module composition. (XLS)
Data
Phylogenetic relationships of Glomeromycota sequences obtained with primers AML1 and AML2 from mycorrhizae in a tropical mountain rain forest (in green letters) and neighboring reforestation sites (in red letters) in South Ecuador. The names of each sequence start with either the clone-number or the Genbank accession number, the site (F pristine fo...
Data
AMF OTU composition for individual Tabebuia seedlings. (XLS)
Data
OTU richness estimation for the following data sets: all samples combined, pristine forest only, reforestation plots only, Cedrela only and Tabebuia only. (XLS)
Chapter
Full-text available
Sebacinales form mycorrhizae with a variety of plant families including Ericaceae and Orchidaceae. Structurally, these mutual associations are quite distinct, with specific structures largely depending on the individual plant family. Many plants that are associated with Sebacinales occur in the same habitats and it has been questioned whether they...
Article
Full-text available
The genus Tulasnella comprises important orchid mycobionts. Molecular phylogenetic studies on nrITS-5.8S sequences of Tulasnella species previously isolated from mycorrhizas of epiphytic orchids from a tropical Andean forest showed genomic variability among clones which was difficult to interpret as intra- or interspecific variations or to correlat...
Article
Full-text available
Fungi are believed to be diverse in the tropics, but because many groups are only known from their DNA sequences this hampers comparative diversity studies. We investigated mycorrhizal Sebacinales (Basidiomycota) of 67 individuals of Ericaceae and Orchidaceae in a tropical mountain ecosystem in Southern Ecuador to provide a first estimate of whethe...