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Lichenized fungi

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https://www.readbyqxmd.com/read/28087947/lichenized-fungi-and-the-evolution-of-symbiotic-organization
#1
Martin Grube, Mats Wedin
Lichen symbioses comprise a fascinating relationship between algae and fungi. The lichen symbiotic lifestyle evolved early in the evolution of ascomycetes and is also known from a few basidiomycetes. The ascomycete lineages have diversified in the lichenized stage to give rise to a tremendous variety of morphologies. Their thalli are often internally complex and stratified for optimized integration of algal and fungal metabolisms. Thalli are frequently colonized by specific nonlichenized fungi and occasionally also by other lichens...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28066125/raman-spectroscopic-analysis-of-the-effect-of-the-lichenicolous-fungus-xanthoriicola-physciae-on-its-lichen-host
#2
Howell G M Edwards, Mark R D Seaward, Tom F Preece, Susana E Jorge-Villar, David L Hawksworth
Lichenicolous (lichen-dwelling) fungi have been extensively researched taxonomically over many years, and phylogenetically in recent years, but the biology of the relationship between the invading fungus and the lichen host has received limited attention, as has the effects on the chemistry of the host, being difficult to examine in situ. Raman spectroscopy is an established method for the characterization of chemicals in situ, and this technique is applied to a lichenicolous fungus here for the first time...
2017: Symbiosis
https://www.readbyqxmd.com/read/28041784/in-vitro-neuroprotective-potential-of-lichen-metabolite-fumarprotocetraric-acid-via-intracellular-redox-modulation
#3
Carlos Fernández-Moriano, Pradeep Kumar Divakar, Ana Crespo, M Pilar Gómez-Serranillos
The lichen-forming fungi Cetraria islandica has been largely used in folk medicines, and it has recently showed promising in vitro antioxidant effects in glial-like cells. Current work aimed at investigating the neuroprotective potential of its major isolated secondary metabolite: the depsidone fumarprotocetraric acid (FUM). H2O2 was used herein to induce oxidative stress (OS)-mediated cytotoxicity in two models of neurons and astrocytes cells (SH-SY5Y and U373-MG cell lines). We found that a pre-treatment with FUM significantly enhanced cell viability compared to H2O2-treated cells, and we selected the optimal concentrations in each model (1 and 25μg/ml, respectively) for assessing its cytoprotective mechanisms...
December 29, 2016: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28035958/a-multifunctional-and-possible-skin-uv-protectant-3r-5-hydroxymellein-produced-by-an-endolichenic-fungus-isolated-from-parmotrema-austrosinense
#4
Lu Zhao, Jin-Cheol Kim, Man-Jeong Paik, Wonjae Lee, Jae-Seoun Hur
Lichens are considered a great bio-resource because they produce large numbers of secondary metabolites with many biological activities; however, they have not been cultivated under artificial conditions to date. As a result, lichen substances from natural sources are limited and have not been widely utilized in commercial applications. Accordingly, interest in lichen-associated fungi, especially endogenic fungi, has increased. Ultraviolet (UV) radiation in sunlight is harmful to human health, resulting in demand for effective UV filtering agents for use in sunscreen...
December 26, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28028548/spatial-molecular-architecture-of-the-microbial-community-of-a-peltigera-lichen
#5
Neha Garg, Yi Zeng, Anna Edlund, Alexey V Melnik, Laura M Sanchez, Hosein Mohimani, Alexey Gurevich, Vivian Miao, Stefan Schiffler, Yan Wei Lim, Tal Luzzatto-Knaan, Shengxin Cai, Forest Rohwer, Pavel A Pevzner, Robert H Cichewicz, Theodore Alexandrov, Pieter C Dorrestein
Microbes are commonly studied as individual species, but they exist as mixed assemblages in nature. At present, we know very little about the spatial organization of the molecules, including natural products that are produced within these microbial networks. Lichens represent a particularly specialized type of symbiotic microbial assemblage in which the component microorganisms exist together. These composite microbial assemblages are typically comprised of several types of microorganisms representing phylogenetically diverse life forms, including fungi, photosymbionts, bacteria, and other microbes...
November 2016: MSystems
https://www.readbyqxmd.com/read/28005941/norlichexanthone-reduces-virulence-gene-expression-and-biofilm-formation-in-staphylococcus-aureus
#6
Mara Baldry, Anita Nielsen, Martin S Bojer, Yu Zhao, Cathrine Friberg, Dan Ifrah, Nina Glasser Heede, Thomas O Larsen, Hanne Frøkiær, Dorte Frees, Lixin Zhang, Huanqin Dai, Hanne Ingmer
Staphylococcus aureus is a serious human pathogen and antibiotic resistant, community-associated strains, such as the methicillin resistant S. aureus (MRSA) strain USA300, continue to spread. To avoid resistance, anti-virulence therapy has been proposed where toxicity is targeted rather than viability. Previously we have shown that norlichexanthone, a small non-reduced tricyclic polyketide produced by fungi and lichens, reduces expression of hla encoding α-hemolysin as well as the regulatory RNAIII of the agr quorum sensing system in S...
2016: PloS One
https://www.readbyqxmd.com/read/27975879/cytotoxic-activity-of-endolichenic-fungi-isolated-from-the-lichen-nephroma-laevigatum
#7
A Lagarde, M Millot, P Jargeat, T S Ouk, V Sol, L Mambu
No abstract text is available yet for this article.
December 2016: Planta Medica
https://www.readbyqxmd.com/read/27929090/glacial-refugia-and-the-prediction-of-future-habitat-coverage-of-the-south-american-lichen-species-ochrolechia-austroamericana
#8
Martin Kukwa, Marta Kolanowska
The biogeographic history of lichenized fungi remains unrevealed because those organisms rarely fossilize due to their delicate, often tiny and quickly rotting thalli. Also the ecology and factors limiting occurrence of numerous taxa, especially those restricted in their distribution to tropical areas are poorly recognized. The aim of this study was to determine localization of glacial refugia of South American Ochrolechia austroamericana and to estimate the future changes in the coverage of its habitats using ecological niche modeling tools...
December 8, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27918622/fungal-algal-association-patterns-in-lichen-symbiosis-linked-to-macroclimate
#9
Garima Singh, Francesco Dal Grande, Pradeep K Divakar, Jürgen Otte, Ana Crespo, Imke Schmitt
Both macroclimate and evolutionary events may influence symbiont association and diversity patterns. Here we assess how climatic factors and evolutionary events shape fungal-algal association patterns in the widely distributed lichen-forming fungal genus Protoparmelia. Multilocus phylogenies of fungal and algal partners were generated using 174 specimens. Coalescent-based species delimitation analysis suggested that 23 fungal hosts are associating with 20 algal species. Principal component analysis (PCA) was performed to infer how fungal-algal association patterns varied with climate...
December 5, 2016: New Phytologist
https://www.readbyqxmd.com/read/27859075/gastropods-slow-down-succession-and-maintain-diversity-in-cryptogam-communities
#10
Steffen Boch, Daniel Prati, Markus Fischer
Herbivore effects on diversity and succession were often studied in plants, but not in cryptogams. Besides direct herbivore effects on cryptogams, we expected indirect effects by changes in competitive interactions among cryptogams. Therefore, we conducted a long-term gastropod exclusion experiment testing for grazing effects on epiphytic cryptogam communities. We estimated the grazing damage, cover and diversity of cryptogams before gastropods were excluded and three and six years thereafter. Gastropod herbivory pronouncedly affected cryptogams, except for bryophytes, strongly depending on host tree species and duration of gastropod exclusion...
September 2016: Ecology
https://www.readbyqxmd.com/read/27828951/limitations-of-species-delimitation-based-on-phylogenetic-analyses-a-case-study-in-the-hypogymnia-hypotrypa-group-parmeliaceae-ascomycota
#11
Xinli Wei, Bruce McCune, H Thorsten Lumbsch, Hui Li, Steven Leavitt, Yoshikazu Yamamoto, Svetlana Tchabanenko, Jiangchun Wei
Delimiting species boundaries among closely related lineages often requires a range of independent data sets and analytical approaches. Similar to other organismal groups, robust species circumscriptions in fungi are increasingly investigated within an empirical framework. Here we attempt to delimit species boundaries in a closely related clade of lichen-forming fungi endemic to Asia, the Hypogymnia hypotrypa group (Parmeliaceae). In the current classification, the Hypogymnia hypotrypa group includes two species: H...
2016: PloS One
https://www.readbyqxmd.com/read/27814595/particulate-beta-glucan-induces-early-and-late-phagosomal-maturation-in-murine-macrophages
#12
Nida Fatima, Tarun Upadhyay, Deepak Sharma, Rolee Sharma
Beta-glucans are carbohydrates (glucose polymers) found in the cell walls of fungi, yeast, algae, lichens, and plants such as oats and barley. Beta-glucans bind to glucan receptor on phagocytic cells and modify these cells to become "immunologically active" by generating a variety of innate immune responses. Particulate beta-glucan has been specifically shown to engage dectin-1 receptor, which leads to the recruitment and activation of nicotinamide adenine dinucleotide phosphate oxidase-2 (NOX-2) and release of antimicrobial reactive oxygen species (ROS)...
January 1, 2017: Frontiers in Bioscience (Elite Edition)
https://www.readbyqxmd.com/read/27769902/from-alaska-to-antarctica-species-boundaries-and-genetic-diversity-of-prasiola-trebouxiophyceae-a-foliose-chlorophyte-associated-with-the-bipolar-lichen-forming-fungus-mastodia-tessellata
#13
Isaac Garrido-Benavent, Sergio Pérez-Ortega, Asunción de Los Ríos
Symbiotic associations between green algae (Chlorophyta) and fungi give rise to morphologically and eco-physiologically distinct entities, or so-called, lichens. In one of the most peculiar of these associations, the partners are species of the macroscopic genus Prasiola (Trebouxiophyceae) and the ascomycete Mastodia tessellata (Verrucariaceae). This is the only known case of a lichen symbiosis involving a foliose green alga. Despite intense research targeted at understanding the biology of this particular association, little is known about the genetic variability of its symbionts...
October 18, 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/27742100/cyphobasidium-gen-nov-a-new-lichen-inhabiting-lineage-in-the-cystobasidiomycetes-pucciniomycotina-basidiomycota-fungi
#14
Ana M Millanes, Paul Diederich, Mats Wedin
Pucciniomycotina is a highly diverse group of fungi, showing a remarkably wide range of lifestyles and ecologies. However, lichen-inhabiting fungi are only represented by a few species included in the genera Chionosphaera and Cystobasidium, and their phylogenetic position has never been investigated. Phylogenetic analyses using the nuclear SSU, ITS, and LSU ribosomal DNA markers reveal that the lichenicolous members of Cystobasidium (C. hypogymniicola, C. usneicola) form a monophyletic group distinct from Cystobasidium and outside the Cystobasidiales...
November 2016: Fungal Biology
https://www.readbyqxmd.com/read/27742095/hidden-diversity-before-our-eyes-delimiting-and-describing-cryptic-lichen-forming-fungal-species-in-camouflage-lichens-parmeliaceae-ascomycota
#15
Steven D Leavitt, Theodore L Esslinger, Pradeep K Divakar, Ana Crespo, H Thorsten Lumbsch
Molecular data provide unprecedented insight into diversity of lichenized fungi, although morphologically cryptic species-level lineages circumscribed from sequence data often remain undescribed even in well-studies groups. Using diagnostic characters from DNA sequence data and support from the multispecies coalescent model, we formally describe a total of eleven new species and resurrect two others in the hyperdiverse lichen-forming fungal family Parmeliaceae. These include: four in the genus Melanelixia - M...
November 2016: Fungal Biology
https://www.readbyqxmd.com/read/27660105/a-chemogenomic-approach-to-understand-the-antifungal-action-of-lichen-derived-vulpinic-acid
#16
Y Kwon, J Cha, J Chiang, G Tran, G Giaever, C Nislow, J-S Hur, Y-S Kwak
AIM: To determine uncovered antifungal activity of lichen-derived compound, vulpinic acid, by using chemical-genetic analyses. METHODS AND RESULTS: Haploinsufficiency and homozygous-profiling assays were performed, revealing that strains lacking GLC7, MET4, RFC2, YAE1 and PRP18 were sensitive to three concentrations (12·5, 25 and 50% of inhibitory concentration) of vulpinic acid and independently validated. To verify inhibition of those genes, cell cycle analysis using flow cytometry was performed and relative expressions were measured...
December 2016: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/27658353/mangiferin-a-review-of-sources-and-interventions-for-biological-activities
#17
REVIEW
Jyotshna, Puja Khare, Karuna Shanker
Xanthones are naturally synthesized in various biological systems such as plants, lichens, and fungi and are stored as by-products. In addition to taxonomic significance they are also important in the treatment/management of a number of human disorders. Mangiferin and its derived lead molecule have never qualified for use in a clinical trial despite a number of pharmacological studies that have proven its effectiveness as an antioxidant, analgesic, antidiabetic, antiproliferative, chemopreventive, radioprotective, cardiotonic, immunomodulatory, and diuretic...
September 10, 2016: BioFactors
https://www.readbyqxmd.com/read/27648556/usnic-acid-activity-on-oxidative-and-nitrosative-stress-of-azole-resistant-candida-albicans-biofilm
#18
Mariana Andrea Peralta, María Angel da Silva, María Gabriela Ortega, José Luis Cabrera, María Gabriela Paraje
Several studies report that (+)-usnic acid, a lichen secondary metabolite, inhibits growth of different bacteria and fungi; however, the mechanism of its antimicrobial activity remains unknown. In this study, we explored the ability of usnic acid, obtained from Usnea amblyoclada, as an antibiofilm agent against azole-resistant and azole-sensitive Candida albicans strains by studying the cellular stress and antioxidant response in biofilms. The biofilm inhibitory concentration of usnic acid (4 µg/mL) exhibited a significant biofilm inhibition, 71...
September 20, 2016: Planta Medica
https://www.readbyqxmd.com/read/27647234/impact-of-alkaline-dust-pollution-on-genetic-variation-of-usnea-subfloridana-populations
#19
Polina Degtjarenko, Liis Marmor, Tiiu Tõrra, Michèle Lerch, Andres Saag, Tiina Randlane, Christoph Scheidegger
Very little is known whether and how air pollution impacts genetic diversity of lichenized fungi that are well-known indicators of environmental quality. We studied the genetic variation of eight Usnea subfloridana populations in Pinus sylvestris-dominated boreal forest stands in southern Estonia, Northern Europe; four of these populations were exposed to long-term dust pollution released from unpaved road. The mean bark pH of lichen phorophyte differed considerably between polluted and unpolluted forest stands...
October 2016: Fungal Biology
https://www.readbyqxmd.com/read/27645140/lichen-secondary-metabolites-affect-growth-of-physcomitrella-patens-by-allelopathy
#20
Michal Goga, Sebastian J Antreich, Martin Bačkor, Wolfram Weckwerth, Ingeborg Lang
Lichen secondary metabolites can function as allelochemicals and affect the development and growth of neighboring bryophytes, fungi, vascular plants, microorganisms, and even other lichens. Lichen overgrowth on bryophytes is frequently observed in nature even though mosses grow faster than lichens, but there is still little information on the interactions between lichens and bryophytes.In the present study, we used extracts from six lichen thalli containing secondary metabolites like usnic acid, protocetraric acid, atranorin, lecanoric acid, nortistic acid, and thamnolic acid...
September 19, 2016: Protoplasma
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