Integrative Fungal Research Cluster IPF

St. Georg, Germany

Integrative Fungal Research Cluster IPF

St. Georg, Germany
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Kruse J.,Goethe University Frankfurt | Kruse J.,Biodiversity and Climate Research Center | Choi Y.-J.,Biodiversity and Climate Research Center | Choi Y.-J.,Kunsan National University | And 3 more authors.
Mycological Progress | Year: 2017

The smut fungi (Ustilaginomycotina) are a highly diverse group, containing about 115 genera and 1700 species, most of which are biotrophic plant pathogens. As for other fungal groups, the ITS rDNA region is widely used to determine smut fungi at species level due to its high discriminatory power and for phylogenetic reconstructions within genera. So far, two primer sets, ITS1/ITS4 and M-ITS1/ITS4, were generally used to amplify smut fungi, but these often co-amplify host plants or contaminant fungi and do not yield satisfactory amplification for a variety of smut fungi. In the present study, based on a selection of genera that include more than 90% of the species of smut fungi (more than half of the genera of smut fungi), three new primers, smITS-F, smITS-R1 and smITS-R2, situated in the SSU or LSU region, were designed to avoid the amplification of host plants and to extend the coverage of PCR amplification for as many smut genera as possible. © 2017 German Mycological Society and Springer-Verlag Berlin Heidelberg

Bennett R.M.,Biodiversity and Climate Research Center | Bennett R.M.,Goethe University Frankfurt | Thines M.,Biodiversity and Climate Research Center | Thines M.,Goethe University Frankfurt | Thines M.,Integrative Fungal Research Cluster IPF
Nova Hedwigia | Year: 2017

Over the past 10 years evidence has increased that Phytophthora species are common in estuarine and coastal environments. These findings made it seem possible that Phytophthora spp. might also be present in mangrove habitats of the Philippines. In this manuscript P insolita, an oospore-producing Phytophthora species devoid of antheridia, is reported as an additional member of estuarine oomycetes and reported from the Philippines for the first time. The Philippine strain, P insolita H3YB, was isolated from a fallen senescent mangrove leaf in Hinigaran, Negros Occidental, Philippines. The morphology of H3YB and its phylogenetic placement agreed with its identification as P insolita. Further targeted studies into the ecology of Phytophthora species in mangroves might shed light on the ecological role of these species in the mangrove ecosystem. © 2017 J. Cramer in Gebr.

Choi Y.-J.,Goethe University Frankfurt | Choi Y.-J.,Biodiversity and Climate Research Center | Thines M.,Goethe University Frankfurt | Thines M.,Biodiversity and Climate Research Center | Thines M.,Integrative Fungal Research Cluster IPF
PLoS ONE | Year: 2015

Even though the microevolution of plant hosts and pathogens has been intensely studied, knowledge regarding macro-evolutionary patterns is limited. Having the highest species diversity and host-specificity among Oomycetes, downy mildews are a useful a model for investigating long-term host-pathogen coevolution. We show that phylogenies of Bremia and Asteraceae are significantly congruent. The accepted hypothesis is that pathogens have diverged contemporarily with their hosts. But maximum clade age estimation and sequence divergence comparison reveal that congruence is not due to long-term coevolution but rather due to host-shift driven speciation (pseudo-cospeciation). This pattern results from parasite radiation in related hosts, long after radiation and speciation of the hosts. As large host shifts free pathogens from hosts with effector triggered immunity subsequent radiation and diversification in related hosts with similar innate immunity may follow, resulting in a pattern mimicking true co-divergence, which is probably limited to the terminal nodes in many pathogen groups. © 2015 Choi, Thines. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Choi Y.-J.,Goethe University Frankfurt | Choi Y.-J.,Biodiversity and Climate Research Center | Klosterman S.J.,U.S. Department of Agriculture | Kummer V.,University of Potsdam | And 6 more authors.
Molecular Phylogenetics and Evolution | Year: 2015

Accurate species determination of plant pathogens is a prerequisite for their control and quarantine, and further for assessing their potential threat to crops. The family Peronosporaceae (Straminipila; Oomycota) consists of obligate biotrophic pathogens that cause downy mildew disease on angiosperms, including a large number of cultivated plants. In the largest downy mildew genus Peronospora, a phylogenetically complex clade includes the economically important downy mildew pathogens of spinach and beet, as well as the type species of the genus Peronospora. To resolve this complex clade at the species level and to infer evolutionary relationships among them, we used multi-locus phylogenetic analysis and species tree estimation. Both approaches discriminated all nine currently accepted species and revealed four previously unrecognized lineages, which are specific to a host genus or species. This is in line with a narrow species concept, i.e. that a downy mildew species is associated with only a particular host plant genus or species. Instead of applying the dubious name Peronospora farinosa, which has been proposed for formal rejection, our results provide strong evidence that Peronospora schachtii is an independent species from lineages on Atriplex and apparently occurs exclusively on Beta vulgaris. The members of the clade investigated, the Peronospora rumicis clade, associate with three different host plant families, Amaranthaceae, Caryophyllaceae, and Polygonaceae, suggesting that they may have speciated following at least two recent inter-family host shifts, rather than contemporary cospeciation with the host plants. © 2015 Elsevier Inc.

Thines M.,Biodiversity and Climate Research Center | Thines M.,Goethe University Frankfurt | Thines M.,Integrative Fungal Research Cluster IPF | Choi Y.-J.,Biodiversity and Climate Research Center | And 2 more authors.
Phytopathology | Year: 2016

Downy mildews are a notorious group of oomycete plant pathogens, causing high economic losses in various crops and ornamentals. The most species-rich genus of oomycetes is the genus Peronospora. This review provides a wide overview of these pathogens, ranging from macro- and micro-evolutionary patterns, their biodiversity and ecology to short overviews for the currently economically most important pathogens and potential emerging diseases. In this overview, the taxonomy of economically relevant species is also discussed, as the application of the correct names and species concepts is a prerequisite for effective quarantine regulations and phytosanitary measures. © 2016 The American Phytopathological Society.

Splivallo R.,Goethe University Frankfurt | Splivallo R.,Integrative Fungal Research Cluster IPF | Ebeler S.E.,University of California at Davis
Applied Microbiology and Biotechnology | Year: 2015

Truffles are symbiotic fungi in high demand for the aroma of their fruiting bodies which are colonized by a diverse microbial flora. Specific sulfur containing volatiles (thiophene derivatives) characteristic of the white truffle Tuber borchii were recently shown to be derived from the bacterial community inhabiting truffle fruiting bodies. Our aim here was to investigate whether thiophene derivatives contributed to the human-sensed aroma of T. borchii. Furthermore, we questioned whether the concentration of thiophene volatiles was affected by freezing or whether it differed in truffles from distinct geographical origins. Gas chromatography–olfactometry (GC-O) analysis revealed that thiophene derivatives were major contributors to the aroma of T. borchii. Of four thiophene derivatives detected in this study, 3-methyl-4,5-dihydrothiophene was the most important one in terms of its contribution to the overall aroma. The relative concentration of thiophene derivatives was unaffected by freezing; however, it differed in samples collected in distinct geographical locations (Italy versus New Zealand). The causes of this variability might be differences in storage conditions and/or in bacterial community composition of the fruiting bodies; however, further work is needed to confirm these hypotheses. Overall, our results demonstrate that thiophene derivatives are major contributors to the human-sensed aroma of T. borchii. © 2015, Springer-Verlag Berlin Heidelberg.

Thines M.,Integrative Fungal Research Cluster IPF | Thines M.,Biodiversity and Climate Research Center | Thines M.,Goethe University Frankfurt
European Journal of Plant Pathology | Year: 2014

Oomycetes have colonised all continents and oceans in a great variety of habitats and are arguably one of the most successful eukaryotic lineages. This is contrasted by the limited knowledge available for this group in various fields in comparison to other ubiquitous eukaryotes, such as unikont fungi, animals or plants. In this review an overview is given on the evolution and diversification of the oomycetes, with focus on the plant parasitic lineages and aspects of wild pathosystems. © 2014 KNPV.

Keim J.,Goethe University Frankfurt | Keim J.,Biodiversity and Climate Research Center | Mishra B.,Goethe University Frankfurt | Mishra B.,Biodiversity and Climate Research Center | And 7 more authors.
Fungal Diversity | Year: 2014

Root-associated fungi, with the focus on endophytic species, were isolated from healthy Arabidopsis thaliana and Microthlaspi perfoliatum plants collected at different locations in Germany. A large number of fungal taxa were discovered with a small-scale approach. This provides additional evidence that root-associated and endophytic fungi are common in Brassicaceae. The most prevalent genera associated with A. thaliana roots were Trichoderma and Fusarium, while the roots of M. perfoliatum were dominated by different species of Fusarium and Penicillium. Differences in species composition and richness might be due to preferences and life-cycle of the two plant species. Strains of endophyte species that did not have closely related species in GenBank searches and those already known as root endophytes were chosen for preliminary co-cultivation experiments using germinating host plants on agar medium to observe effects on plant growth and health. Under these conditions several fungal isolates had an adverse effect on plant growth and health, especially on Arabidopsis thaliana. Some isolates did not adversely affect biomass during initial plant growth, while they altered the shoot-root ratio in favour of the shoot, especially in Microthlaspi perfoliatum. These strains are promising candidates for future research on endophytes as they might have some effects in Brassicaceae that are similar to mycorrhizal fungi. They are also promising candidates for investigating interactions with their host plants. © 2014 Mushroom Research Foundation.

Hemetsberger C.,Max Planck Institute for Terrestrial Microbiology | Hemetsberger C.,TU Munich | Mueller A.N.,Max Planck Institute for Terrestrial Microbiology | Matei A.,Max Planck Institute for Terrestrial Microbiology | And 15 more authors.
New Phytologist | Year: 2015

The secreted fungal effector Pep1 is essential for penetration of the host epidermis and establishment of biotrophy in the Ustilago maydis-maize pathosystem. Previously, Pep1 was found to be an inhibitor of apoplastic plant peroxidases, which suppresses the oxidative burst, a primary immune response of the host plant and enables fungal colonization. To investigate the conservation of Pep1 in other pathogens, genomes of related smut species were screened for pep1 orthologues. Pep1 proteins were produced in Escherichia coli for functional assays. The biological function of Pep1 was tested by heterologous expression in U. maydis and Hordeum vulgare. Pep1 orthologues revealed a remarkable degree of sequence conservation, indicating that this effector might play a fundamental role in virulence of biotrophic smut fungi. Pep1 function and its role in virulence are conserved in different pathogenic fungi, even across the monocot-dicot border of host plants. The findings described in this study classify Pep1 as a phylogenetically conserved fungal core effector. Furthermore, we documented the influence of Pep1 on the disease caused by Blumeria graminis f. sp. hordei which is a non-smut-related pathosystem. © 2015 New Phytologist Trust.

PubMed | Integrative Fungal Research Cluster IPF, Pamukkale University, Goethe University Frankfurt and Biodiversity and Climate Research Center
Type: Journal Article | Journal: Environmental microbiology | Year: 2016

Root endophytic fungi are found in a great variety of plants and ecosystems, but the ecological drivers of their biogeographic distribution are poorly understood. Here, we investigate the occurrence of root endophytes in the non-mycorrhizal plant genus Microthlaspi, and the effect of environmental factors and geographic distance in structuring their communities at a continental scale. We sampled 52 plant populations across the northern Mediterranean and central Europe and used a cultivation approach to study their endophytic communities. Cultivation of roots yielded 2601 isolates, which were grouped into 296 operational taxonomic units (OTUs) by internal transcribed spacer sequencing of 1998 representative colonies. Climatic and spatial factors were the best descriptors of the structure of endophytic communities, outweighing soil characteristics, host genotype and geographical distance. OTU richness was negatively affected by precipitation, and the composition of communities followed latitudinal gradients of precipitation and temperature. Only six widespread OTUs belonging to the orders Pleosporales, Hypocreales and Helotiales represented about 50% of all isolates. Assessments of their individual distribution revealed particular ecological preferences or a cosmopolitan occurrence. Our findings support a strong influence of the local environment in determining root endophytic communities, and show a different niche occupancy by individual endophytes.

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