Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Habitats impacts by beam and pulse trawling in the Southern North Sea
    Depestele, Jochen ; Degrendele, Koen ; Esmaeili, Moosa ; Ivanovic, Ana ; Kroger, Silke ; O'Neill, Finbarr G. ; Parker, Ruth ; Polet, Hans ; Roche, Marc ; Summerbell, Keith ; Teal, L.R. ; Vanelslander, Bart ; Rijnsdorp, A.D. - \ 2018
    - 17 p.
    Mechanical seabed disturbance by flatfish-directed tickler-chain trawls and pulse trawls
    Depestele, Jochen ; Degrendele, Koen ; Esmaeili, Moosa ; Ivanovic, Ana ; Kroger, Silke ; O'Neill, Finbarr G. ; Parker, Ruth ; Polet, Hans ; Roche, Marc ; Summerbell, Keith ; Teal, L.R. ; Vanelslander, Bart ; Rijnsdorp, A.D. - \ 2018
    Measuring and assessing the physical impact of beam trawling
    Depestele, J. ; Ivanovic, A. ; Esmaelli, M. ; Polet, H. ; Roche, M. ; Summerbell, K. ; Teal, L.R. ; Vanelslander, B. ; O'Neill, F.G. - \ 2016
    ICES Journal of Marine Science 73 (2016)S1. - ISSN 1054-3139 - p. i15 - i26.
    Beam trawling causes physical disruption of the seabed through contact of the gear components with the sediment and the resuspension of sediment into the water column in the turbulent wake of the gear. To be able to measure and quantify these impacts is important so that gears of reduced impact can be developed. Here we assess the physical impact of both a conventional 4 m tickler-chain beam trawl and a “Delmeco” electric pulse beam trawl. We measure the changes in seabed bathymetry following the passage of these gears using a Kongsberg EM2040 multi-beam echosounder and use a LISST 100X particle size analyser to measure the concentration and particle size distribution of the sediment mobilized into the water column. We also estimate the penetration of the gears into the seabed using numerical models for the mechanical interaction between gears and seabed. Our results indicate that the seabed bathymetry changes between ~1 and 2 cm and that it is further increased by higher trawling frequencies. Furthermore, our results suggest that the alteration following the passage of the conventional trawl is greater than that following the pulse trawl passage. There was no difference in the quantity of sediment mobilized in the wake of these two gears; however, the numerical model introduced in this study predicted that the tickler-chain trawl penetrates the seabed more deeply than the pulse gear. Hence, greater alteration to the seabed bathymetry by the tickler-chain beam trawling is likely to be a result of its greater penetration. The complimentary insights of the different techniques highlight the advantage of investigating multiple effects such as sediment penetration and resuspension simultaneously and using both field trials and numerical modelling approaches.
    Genera in Bionectriaceae, Hypocreaceae, and Nectriaceae (Hypocreales) proposed for acceptance or rejection
    Rossman, A.Y. ; Seifert, K.A. ; Samuels, G.J. ; Minnis, A.M. ; Schroers, H.J. ; Lombard, L. ; Crous, P.W. ; Põldmaa, K. ; Cannon, P.F. ; Summerbell, R.C. ; Geiser, D.M. ; Zhuang, W. ; Hirooka, Y. ; Herrera, C. ; Salgado-Salazar, C. ; Chaverri, P. - \ 2013
    IMA fungus 4 (2013)1. - ISSN 2210-6340 - p. 41 - 51.
    With the recent changes concerning pleomorphic fungi in the new International Code of Nomenclature for algae, fungi, and plants (ICN), it is necessary to propose the acceptance or protection of sexual morph-typified or asexual morph-typified generic names that do not have priority, or to propose the rejection or suppression of competing names. In addition, sexual morph-typified generic names, where widely used, must be proposed for rejection or suppression in favour of asexual morph-typified names that have priority, or the latter must be proposed for conservation or protection. Some pragmatic criteria used for deciding the acceptance or rejection of generic names include: the number of name changes required when one generic name is used over another, the clarity of the generic concept, their relative frequencies of use in the scientific literature, and a vote of interested mycologists. Here, twelve widely used generic names in three families of Hypocreales are proposed for acceptance, either by conservation or protection, despite their lack of priority of publication, or because they are widely used asexual morph-typified names. Each pair of generic names is evaluated, with a recommendation as to the generic name to be used, and safeguarded, either through conservation or protection. Four generic names typified by a species with a sexual morph as type that are younger than competing generic names typified by a species with an asexual morph type, are proposed for use. Eight older generic names typified by species with an asexual morph as type are proposed for use over younger competing generic names typified by a species with a sexual morph as type. Within Bionectriaceae, Clonostachys is recommended over Bionectria; in Hypocreaceae, Hypomyces is recommended over Cladobotryum, Sphaerostilbella over Gliocladium, and Trichoderma over Hypocrea; and in Nectriaceae, Actinostilbe is recommended over Lanatonectria, Cylindrocladiella over Nectricladiella, Fusarium over Gibberella, Gliocephalotrichum over Leuconectria, Gliocladiopsis over Glionectria, Nalanthamala over Rubrinectria, Nectria over Tubercularia, and Neonectria over Cylindrocarpon.
    An internet-accessible DNA sequence database for identifying fusaria from human and animal infections
    O'Donnell, K. ; Sutton, D.A. ; Rinaldi, M.G. ; Sarver, B.A.J. ; Balajee, S.A. ; Schroers, H.J. ; Summerbell, R.C. ; Robert, V.A.R.G. ; Crous, P.W. ; Zhang, N. ; Aoki, T. ; Jung, K. ; Park, J. ; Lee, Y.H. ; Kang, S. ; Park, B. ; Geiser, D.M. - \ 2010
    Journal of Clinical Microbiology 48 (2010)10. - ISSN 0095-1137 - p. 3708 - 3718.
    solani species complex - vitro antifungal susceptibility - molecular phylogenetic diversity - gene genealogies - fungal pathogens - reproductive isolation - cryptic speciation - contact-lens - identification - aspergillus
    Because less than one-third of clinically relevant fusaria can be accurately identified to species level using phenotypic data (i.e., morphological species recognition), we constructed a three-locus DNA sequence database to facilitate molecular identification of the 69 Fusarium species associated with human or animal mycoses encountered in clinical microbiology laboratories. The database comprises partial sequences from three nuclear genes: translation elongation factor 1{alpha} (EF-1{alpha}), the largest subunit of RNA polymerase (RPB1), and the second largest subunit of RNA polymerase (RPB2). These three gene fragments can be amplified by PCR and sequenced using primers that are conserved across the phylogenetic breadth of Fusarium. Phylogenetic analyses of the combined data set reveal that, with the exception of two monotypic lineages, all clinically relevant fusaria are nested in one of eight variously sized and strongly supported species complexes. The monophyletic lineages have been named informally to facilitate communication of an isolate's clade membership and genetic diversity. To identify isolates to the species included within the database, partial DNA sequence data from one or more of the three genes can be used as a BLAST query against the database which is Web accessible at FUSARIUM-ID (http://isolate.fusariumdb.org) and the Centraalbureau voor Schimmelcultures (CBS-KNAW) Fungal Biodiversity Center (http://www.cbs.knaw.nl/fusarium). Alternatively, isolates can be identified via phylogenetic analysis by adding sequences of unknowns to the DNA sequence alignment, which can be downloaded from the two aforementioned websites. The utility of this database should increase significantly as members of the clinical microbiology community deposit in internationally accessible culture collections (e.g., CBS-KNAW or the Fusarium Research Center) cultures of novel mycosis-associated fusaria, along with associated, corrected sequence chromatograms and data, so that the sequence results can be verified and isolates are made available for future study.
    Dark septate root endophytic fungi increase growth of Scots pine seedlings under elevated CO2 through enhanced nitrogen use efficiency.
    Alberton, O. ; Kuyper, T.W. ; Summerbell, R.C. - \ 2010
    Plant and Soil 328 (2010)1-2. - ISSN 0032-079X - p. 459 - 470.
    sub-alpine plants - phialocephala-fortinii - ectomycorrhizal fungi - glacier forefront - molecular characterization - microfungal endophytes - ecosystem responses - 2 strains - mycorrhizal - soil
    Although increasing concentrations of atmospheric CO2 are predicted to have substantial impacts on plant growth and functioning of ecosystems, there is insufficient understanding of the responses of belowground processes to such increases. We investigated the effects of different dark septate root endophytic (DSE) fungi on growth and nutrient acquisition by Pinus sylvestris seedlings under conditions of N limitation and at ambient and elevated CO2 (350 or 700 µ1 CO2 l-1). Each seedling was inoculated with one of the following species: Phialocephala fortinii (two strains), Cadophora finlandica, Chloridium paucisporum, Scytalidium vaccinii, Meliniomyces variabilis and M. vraolstadiae. The trial lasted 125 days. During the final 27 days, the seedlings were labeled with 14CO2 and 15NH4+. We measured extraradical hyphal length, internal colonization, plant biomass, 14C allocation, and plant N and 15N content. Under elevated CO2, the biomass of seedlings inoculated with DSE fungi was on average 17% higher than in control seedlings. Simultaneously, below-ground respiration doubled or trebled, and as a consequence carbon use efficiency by the DSE fungi significantly decreased. Shoot N concentration decreased on average by 57% under elevated CO2 and was lowest in seedlings inoculated with S. vaccinii. Carbon gain by the seedlings despite reduced shoot N concentration indicates that DSE fungi increase plant nutrient use efficiency and are therefore more beneficial to the plant under elevated CO2
    The Ascomycota tree of life: a phylum-wide phylogeny clarifies the origin and evolution of fundamental reproductive and ecological traits
    Schoch, C.L. ; Sung, G.H. ; López-Giráldez, F. ; Townsend, J.P. ; Miadlikowska, J. ; Hofstetter, V. ; Robbertse, B. ; Brandon Matheny, P. ; Kauff, F. ; Wang, Z. ; Gueidan, C. ; Andrie, R.M. ; Trippe, K. ; Ciufetti, L.M. ; Wynns, A. ; Fraker, E. ; Hodkinson, B.P. ; Bonito, G. ; Groenewald, J.Z. ; Arzanlou, M. ; Hoog, G.S. de; Crous, P.W. ; Hewitt, D. ; Pfister, D.H. ; Peterson, K. ; Gryzenhout, M. ; Wingfield, M.J. ; Aptroot, A. ; Suh, S.O. ; Blackwell, M. ; Hillis, D.M. ; Griffith, G.W. ; Castlebury, L.A. ; Rossman, A.Y. ; Lumbsch, H.T. ; Lücking, R. ; Büdel, B. ; Rauhut, A. ; Diederich, P. ; Ertz, D. ; Geiser, D.M. ; Hosaka, K. ; Inderbitzin, P. ; Kohlmeyer, J. ; Volkmann-Kohlmeyer, B. ; Mostert, L. ; O'Donnell, K. ; Sipman, H. ; Rogers, J.D. ; Shoemaker, R.A. ; Sugiyama, J. ; Summerbell, R.C. ; Untereiner, W. ; Johnston, P.R. ; Stenroos, S. ; Zuccaro, A. ; Dyer, P.S. ; Crittenden, P.D. ; Cole, M.S. ; Hansen, K. ; Trappe, J.M. ; Yahr, R. ; Lutzoni, F. ; Spatafora, J.W. - \ 2009
    Systematic Biology 58 (2009)2. - ISSN 1063-5157 - p. 224 - 239.
    rna-polymerase-ii - multiple sequence alignment - fungal lineages - cleistothecial fungi - classification - subunit - pezizomycotina - divergence - morphology - eukaryotes
    We present a 6-gene, 420-species maximum-likelihood phylogeny of Ascomycota, the largest phylum of Fungi. This analysis is the most taxonomically complete to date with species sampled from all 15 currently circumscribed classes. A number of superclass-level nodes that have previously evaded resolution and were unnamed in classifications of the Fungi are resolved for the first time. Based on the 6-gene phylogeny we conducted a phylogenetic informativeness analysis of all 6 genes and a series of ancestral character state reconstructions that focused on morphology of sporocarps, ascus dehiscence, and evolution of nutritional modes and ecologies. A gene-by-gene assessment of phylogenetic informativeness yielded higher levels of informativeness for protein genes (RPB1, RPB2, and TEF1) as compared with the ribosomal genes, which have been the standard bearer in fungal systematics. Our reconstruction of sporocarp characters is consistent with 2 origins for multicellular sexual reproductive structures in Ascomycota, once in the common ancestor of Pezizomycotina and once in the common ancestor of Neolectomycetes. This first report of dual origins of ascomycete sporocarps highlights the complicated nature of assessing homology of morphological traits across Fungi. Furthermore, ancestral reconstruction supports an open sporocarp with an exposed hymenium (apothecium) as the primitive morphology for Pezizomycotina with multiple derivations of the partially (perithecia) or completely enclosed (cleistothecia) sporocarps. Ascus dehiscence is most informative at the class level within Pezizomycotina with most superclass nodes reconstructed equivocally. Character-state reconstructions support a terrestrial, saprobic ecology as ancestral. In contrast to previous studies, these analyses support multiple origins of lichenization events with the loss of lichenization as less frequent and limited to terminal, closely related species.
    Molecular mechanisms of pathogenicity: how do pathogenic microorganisms develop cross-kingdom host jumps?
    Baarlen, P. van; Belkum, A. van; Summerbell, R.C. ; Crous, P.W. ; Thomma, B.P.H.J. - \ 2007
    FEMS Microbiology Reviews 31 (2007)3. - ISSN 0168-6445 - p. 239 - 277.
    programmed cell-death - nf-kappa-b - staphylococcus-aureus pathogenesis - mucoid pseudomonas-aeruginosa - burkholderia-cepacia complex - microbial iron transport - cultured-mammalian-cells - iii protein secretion - f-sp lycopersici - cryptococcus-neoformans
    It is common knowledge that pathogenic viruses can change hosts, with avian influenza, the HIV, and the causal agent of variant Creutzfeldt-Jacob encephalitis as well-known examples. Less well known, however, is that host jumps also occur with more complex pathogenic microorganisms such as bacteria and fungi. In extreme cases, these host jumps even cross kingdom of life barriers. A number of requirements need to be met to enable a microorganism to cross such kingdom barriers. Potential cross-kingdom pathogenic microorganisms must be able to come into close and frequent contact with potential hosts, and must be able to overcome or evade host defences. Reproduction on, in, or near the new host will ensure the transmission or release of successful genotypes. An unexpectedly high number of cross-kingdom host shifts of bacterial and fungal pathogens are described in the literature. Interestingly, the molecular mechanisms underlying these shifts show commonalities. The evolution of pathogenicity towards novel hosts may be based on traits that were originally developed to ensure survival in the microorganism's original habitat, including former hosts.
    Eucalyptus microfungi known from culture. 2. Alysidiella, Fusculina and Phlogicylindrium genera nova, with notes on some other poorly known taxa
    Summerell, B.A. ; Groenewald, J.Z. ; Carnegie, A.J. ; Summerbell, R.C. ; Crous, P.W. - \ 2006
    Fungal Diversity 23 (2006). - ISSN 1560-2745 - p. 323 - 350.
    south-africa - phylogenetic reassessment - mycosphaerella spp. - cylindrocladium anamorphs - australia - fungi - genus - cryphonectria - speciation - vesicles
    Although numerous microfungi have been described from Eucalyptus in recent years, this plant genus remains a rich substrate colonized by numerous undescribed species. In the present study several species and genera of ascomycetes were collected from symptomatic leaves or from leaf litter of this host in Australia, South Africa and Europe. New genera include those encompassing Alysidiella parasitica and Phlogicylindrium eucalypti genera et spp. nov. (hyphomycetes), and Fusculina eucalypti gen. et sp. nov. (a coelomycete). New species include Colletogloeopsis blakelyi, C. considenianae, C. dimorpha, Elsinoe eucalyptorum, Harknessia rhabdosphaera, Neofusicoccum corticosae and Staninwardia suttonii. A new combination is proposed for Microsphaeropsis eucalypti in Readeriella, while new cultures, hosts and distribution records are reported for Cytospora diatrypelloidea, Mycosphaerella swartii, Plectosphaera eucalypti and Valsa fabianae.
    Preliminary studies on Botryosphaeria species from Southern Hemisphere conifers in Australasia and South Africa
    Slippers, B. ; Summerbell, B.A. ; Crous, P.W. ; Coutinho, T.A. ; Wingfield, B.D. ; Wingfield, M.J. - \ 2005
    Australasian Plant Pathology 34 (2005)2. - ISSN 0815-3191 - p. 213 - 220.
    wollemia-nobilis - genetic-variation - sp-nov - eucalyptus - dothidea - characters - pathogens - sequences - cankers - ribis
    Wollemia nobilis is an ancient coniferous tree species that was recently discovered in eastern Australia. This tree is highly threatened due to its limited distribution. No genetic variation has been detected within the wild populations of ~100 adult plants. A recent study has revealed that a species of Botryosphaeria is highly pathogenic to W. nobilis. The aim of the present study was to identify this fungus, as well as Botryosphaeria isolates of unknown identity from other Southern Hemisphere coniferous hosts, Araucaria from New Zealand and Widdringtonia from South Africa. To facilitate their identification, sequence data for the ITS rDNA, as well as the ß-tubulin and translation elongation factor 1-¿ genes were combined to determine the phylogenetic relationship of these isolates with those of known Botryosphaeria spp. Isolates from W. nobilis included two Botryosphaeria spp. The first is closely related to B. ribis, but also shares some unique sequence polymorphisms with B. parva. One isolate grouped with B. australis, but also varied slightly from this taxon in the gene regions analysed. Additional isolates will be needed to determine whether these sequence variations represent speciation events or merely variation within populations of B. ribis and B. australis. In addition to this, B. parva was identified from Araucaria in New Zealand, and B. australis was found on Widdringtonia trees in South Africa. All three reports of these fungi are new records for their various hosts and could represent important pathogens of these trees
    Species of Phaeoacremonium associated with human infections and environmental reservoirs in infected woody plants
    Mostert, L. ; Groenewald, J.Z. ; Summerbell, R.C. ; Robert, V. ; Sutton, D.A. ; Padhye, A.A. ; Crous, P.W. - \ 2005
    Journal of Clinical Microbiology 43 (2005)4. - ISSN 0095-1137 - p. 1752 - 1767.
    phialophora-repens - primer sets - phaeohyphomycosis - phylogeny - grapevine - togninia - disease
    To date, three species of Phaeoacremonium have been associated with phaeohyphomycosis. These are P. parasiticum (formerly Phialophora parasitica), P. inflatipes, and P. rubrigenum. Numerous unknown isolates resembling Phaeoacremonium spp. have in recent years been isolated from human patients as well as from woody plants that appear to be the main environmental source of these fungi. Nine new Phaeoacremonium species, of which six were obtained as etiologic agents of human opportunistic infection, are reported. They can be identified based on their cultural and morphological characters, and the identifications are strongly supported in phylogenetic analyses of partial sequences of the actin, ß-tubulin, and calmodulin genes. A multiple-entry electronic key based on morphological, cultural, and ß-tubulin sequence data was developed to facilitate routine species identification. Reexamination of all isolates of P. inflatipes associated with human disease showed them to be misidentified and to belong to the new taxa described here
    Microcoding: the second step in DNA barcoding
    Summerbell, R.C. ; Lévesque, C.A. ; Seifert, K.A. ; Bovers, M. ; Fell, J.W. ; Diaz, M.R. ; Boekhout, T. ; Hoog, G.S. de; Stalpers, J.A. ; Crous, P.W. - \ 2005
    Philosophical Transactions of the Royal Society B. Biological sciences 360 (2005)1462. - ISSN 0962-8436 - p. 1897 - 1903.
    mycobacterium-tuberculosis - molecular taxonomy - identification - fungi - complex - yeasts - differentiation - hybridization - systematics - phylogeny
    After the process of DNA barcoding has become well advanced in a group of organisms, as it has in the economically important fungi, the question then arises as to whether shorter and literally more barcode-like DNA segments should be utilized to facilitate rapid identification and, where applicable, detection. Through appropriate software analysis of typical full-length barcodes (generally over 500 base pairs long), uniquely distinctive oligonucleotide `microcodes¿ of less than 25bp can be found that allow rapid identification of circa 100¿200 species on various array-like platforms. Microarrays can in principle fulfill the function of microcode-based species identification but, because of their high cost and low level of reusability, they tend to be less cost-effective. Two alternative platforms in current use in fungal identification are reusable nylon-based macroarrays and the Luminex system of specific, colour-coded DNA detection beads analysed by means of a flow cytometer. When the most efficient means of rapid barcode-based species identification is sought, a choice can be made either for one of these methodologies or for basic high-throughput sequencing, depending on the strategic outlook of the investigator and on current costs. Arrays and functionally similar platforms may have a particular advantage when a biologically complex material such as soil or a human respiratory secretion sample is analysed to give a census of relevant species present.
    Diversity of symbiotic root endophytes of the Helotiales in ericaceous plants and the grass, Deschampsia flexuosa
    Zijlstra, J.D. ; Hof, P. van 't; Baar, J. ; Verkley, G.J.M. ; Summerbell, R.C. ; Paradi, I. ; Braakhekke, W.G. ; Berendse, F. - \ 2005
    Studies in Mycology (2005)53. - ISSN 0166-0616 - p. 147 - 162.
    ericoid mycorrhizal fungi - dark septate endophytes - boreal forest plants - amino-acid-uptake - phialocephala-fortinii - hymenoscyphus-ericae - molecular diversity - calluna-vulgaris - ectomycorrhizal fungi - community structure
    In a study of fungi growing in various root-associated habitats in and around Picea mariana, black spruce, in northern Ontario, Canada, an examination was made of the degree to which differences in growth sites within an area of a few square kilometers might influence the structure of root-associated filamentous microfungal populations. Picea mariana roots were collected at four strongly differing boreal forest sites: an undisturbed forest site with deep litter and humus layers; a recently regenerated forest; a clearcut, former portable sawmill site with a few small, naturally regenerated trees; and an open peat bog penetrated by roots from trees growing along the margin. Comparisons were done on isolate assemblages primarily from serially washed mycorrhizae, supplemented with comparison samples from washed root bark and adherent rhizosphere soil. The Bray & Curtis similarity index and nodal components analysis were utilised to identify trends within the data. Root endophyte fungi, mainly Phialocephala fortinii and Meliniomyces variabilis, were among the most common isolates from serially washed mycorrhizae and showed strong trends among the site types, with the former most common from sites low in humus and also low in known humus-associated microfungi, and the latter most common from the peat bog site. The overall composition of the isolate assemblages from washed mycorrhizae mainly reflected site factors, with assemblages from the undisturbed and regenerated forest sites similar to one another and those from the clearcut and peat bog sites strongly distinct. A major difference was also seen between two seasonal samples at the exposed clearcut site, but few seasonal differences were seen at the other sites. The regenerated and undisturbed forest sites were high in Umbelopsis isabellina, Mortierella verticillata and Penicillium spinulosum, fungi typical of humic horizons in boreal podzols; the clearcut yielded the greatest numbers of Fusarium proliferatum, Umbelopsis nana and Penicillium montanense isolates, an assemblage tending to indicate exposed mineral soil; while the peat bog was typified by the presence of characteristic northern peat inhabitants Mortierella pulchella and P. spinulosum, as well as temperate peat inhabitant Penicillium lividum. A synthesis of these results with other data suggests that as a microhabitat, the mycorrhizosphere, as originally defined by Foster & Marks, is of little significance in determining the structure of filamentous fungal populations in soil influenced by the presence of ectomycorrhizal forest tree roots. Edaphic and overall microbial community conditions are much more significant, but the influence of a ¿symbiorhizosphere effect¿ exerted by certain ectomycorrhizal symbionts within the whole soil volume they occupy is also known in some cases and worthy of further investigation.
    Togninia (Calosphaeriales) is confirmed as teleomorph of Phaeoacremonium by means of morphology, sexual compatibility, and DNA phylogeny
    Mostert, L. ; Crous, P.W. ; Groenewald, J.Z. ; Gams, W. ; Summerbell, R.C. - \ 2003
    Mycologia 95 (2003)4. - ISSN 0027-5514 - p. 646 - 659.
    grapevine - diseases - decline
    Petri disease, or black goo, is a serious disease of vines in most areas where grapevines are cultivated. The predominant associated fungus is Phaeomoniella chlamydospora (Chaetothyriales). Several species of Phaeoacremonium (Pm.) also are associated, of which Pm. aleophilum is the most common. Although no teleomorph is known for Phaeoacremonium, the genus Togninia previously has been linked to phaeoacremonium-like anamorphs. To investigate the possible anamorph-teleomorph connection of Phaeoacremonium to Togninia, anamorphs of Togninia minima, T fraxinopennsylvanica and T novae-zealandiae morphologically were compared with Pm. aleophilum and some representative cultures were mated in all combinations. Although no interspecies mating proved fertile, matings between isolates of Pm. aleophilum produced a Togninia teleomorph within 3-4 weeks. Certain field isolates of Pm. aleophilum commonly produced the teleomorph, demonstrating that both mating types can occur in the same vine and thus also explaining the genetic diversity observed for this fungus in some vineyards. To elucidate the phylogenetic relationships among these taxa, isolates were subjected to sequence analysis of the nuclear ribosomal internal transcribed spacers (ITS1, ITS2) and the 5.8S rRNA gene, as well as portions of the translation elongation factor I alpha (EF-1alpha) gene. The generic placement of teleomorphs within Togninia (Calosphaeriales) further was confirmed via phylogenetic analyses of 18S small subunit (SSU) DNA. From these sequences, morphological and mating data, we conclude that T minima is the teleomorph of Pm. aleophilum, and that it has a biallelic heterothallic mating system. An epitype and mating type tester strains also are designated for T minima.
    Two Cryptosporiopsis species form functional ericoid mycorrhiza in Dutch ericoid plants and are able to degrade soluble phenolics
    Zijlstra, J.D. ; Verkley, G.J.M. ; Baar, J. ; Summerbell, R. ; Berendse, F. - \ 2003
    Lange-termijneffect van biologische grondontsmetting op Verticillium verwelking bij esdoorn en trompetboom (samenvatting)
    Goud, J.C. ; Blok, W.J. ; Bruggen, A.H.C. van; Lamers, J.G. ; Termorshuizen, A.J. - \ 2003
    Gewasbescherming 34 (2003)4. - ISSN 0166-6495 - p. 134 - 135.
    plantenziektekunde - bodemschimmels - antagonisme - bacteriën - bodembiologie - biologische indicatoren (populatie-ecologie) - biologische bestrijding - organismen ingezet bij biologische bestrijding - ecosystemen - catalpa - acer pseudoplatanus - tarwe - bodemmicrobiologie - plant pathology - soil fungi - antagonism - bacteria - soil biology - biological tags - biological control - biological control agents - ecosystems - catalpa - acer pseudoplatanus - wheat - soil microbiology
    Samenvattingen van 5 presentaties met auteurs en titels: 1) J.F. Salles; P. Garbeva, J.A. van Veen en J.D. van Elsas. Invloed van verschillende gewassen op de diversiteit van Burkholderia-stammen en de selectie van antagonistische isolaten; 2) J.C. Goud, W.J. Blok, A.H.C. Lamers en A.J. Termorshuizen. Lange-termijneffect van biologische grondontsmetting op Verticillium-verwelking bij esdoorn en trompetboom; 3) F.X. Prenafeta-Boldù, R.C. Summerbell en W. Gams. Schimmeldiversiteit in bodems van uiteenlopende rijpheid: vergelijking van isolatieresultaten en moleculaire karakterisering; 4) L.B. Folman. Fungal Bacterial Interactions (FBI), een inventarisatie van microbiële gemeenschappen in bodems met verschillende schimmeldichtheid; 5) M. Viebahn, Christiaan Veenman, Diana Tellekamp, E. Smit, K. Wernars, L.C. van Loon en P.A.H.M. Bakker. Effecten van genetisch gemodificeerde Pseudomonas putida WCS358r op bacteriën en ascomyceten in de rhizosfeer van tarwe
    Phylogeny and taxonomy of root-inhabiting Cryptosporiopsis species, and C. rhizophila sp. nov., a fungus inhabiting roots of several Ericaceae
    Verkley, G.J.M. ; Zijlstra, J.D. ; Summerbell, R. ; Berendse, F. - \ 2003
    Mycological Research 107 (2003)6. - ISSN 0953-7562 - p. 689 - 698.
    ericoid mycorrhizal fungi - active secondary metabolites - quercus-robur - molecular diversity - pezicula - strains - gene - dna
    Three Cryptosporiopsis species have thus far been isolated from roots of woody plants. A fourth species, which was recently isolated from roots of Calluna vulgaris, Erica tetralix, Vaccinium vitis-idaea, and V. myrtillus in The Netherlands, is described here as new. Sporulation on the natural substratum has not been observed and the morphological description of this fungus is therefore based on characters expressed on oatmeal and malt extract agars. The phenotypic characters indicated a close relationship with the other root-inhabiting species of Cryptosporiopsis and species of the associated teleomorph genus Pezicula. This relationship was confirmed by phylogenetic analyses using sequence data of the 5.8S nuclear rDNA and flanking internal transcribed spacers. In order to facilitate recognition of this possibly under-recognized category of root inhabitants, a key to the root-inhabiting Cryptosporiopsis species based on characters in vitro is given.
    Multiple gene genealogies delineate several additional species of Phaeoacremonium
    Mostert, L. ; Crous, P.W. ; Groenewald, J.Z. ; Gams, W. ; Summerbell, R. - \ 2003
    In: Book of Abstracts of Offered Papers 8th International Congress of Plant Pathology, Christchurch, New Zealand, 2-7 February 2003 [S.l.] : S.n. - ISBN 9780864761521 - p. 343 - 343.
    Fungal biodiversity in a regeneration series in Colombia Amazonia
    Boekhout, T. ; Franco Molano, A.E. ; López Quintero, C. ; Silvestri, M. ; Cleef, A.M. ; Summerbell, R.C. - \ 2002
    The Hague, : Unknown Publisher
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