Phylogenetic Origins of the Asexual Mycorrhizal SymbiontCenococcum geophilumFr. and Other Mycorrhizal Fungi among the Ascomycetes

LoBuglio, Katherine F.; Berbee, Mary L.; Taylor, John W.

doi:10.1006/mpev.1996.0077

Cited by 92 publications

(54 citation statements)

References 8 publications

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“…5). Similarly, an analysis by Lobuglio, Berbee & Taylor (1996) showed clear ascomycetous affinity for Phialocephala fortinii and Phialophora finlandia. Currah & Sherburne (1992) concluded that Leptodontidium orchidicola has a likely ascomycetous affinity, as judged by the septal ultrastructure.…”

Section:    mentioning

confidence: 99%

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Dark septate endophytes: a review of facultative biotrophic root‐colonizing fungi

1998

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Dark septate root endophytes (DSE) are conidial or sterile fungi (Deuteromycotina, Fungi Imperfecti) likely to be ascomycetous and colonizing plant roots. They have been reported for nearly 600 plant species representing about 320 genera and 100 families. DSE fungi occur from the tropics to arctic and alpine habitats and comprise a heterogeneous group that functionally and ecologically overlaps with soil fungi, saprotrophic rhizoplaneinhabiting fungi, obligately and facultatively pathogenic fungi and mycorrhizal fungi. Numerous species of undescribed sterile and anamorphic taxa may also await discovery. Although DSE are abundant in washed root and soil samples from various habitats, and are easily isolated from surface-sterilized roots of ecto-, ectendo-, endo-and non-mycorrhizal host species, their ecological functions are little understood. Studies of DSE thus far have yielded inconsistent results and only poorly illustrate the role of DSE in their natural habitats. These inconsistencies are largely due to the uncertain taxonomic affinities of the strains of DSE used. In addition, because different strains of a single anamorph taxon seem to vary greatly in function, no clear generalizations on their ecological role have been drawn. This paper reviews the current literature on DSE and the ecology and discusses the need for and direction of future research.

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Section:    mentioning

confidence: 99%

“…5). The 18S data by Lobuglio et al (1996) positioned Phialocephala fortinii close to Leotiales. reported small aggregations of apothecium-like structures on the surface of the substrate in cultures in which colonization brachycarpum was inoculated with Phialocephala fortinii.…”

Section:    mentioning

confidence: 99%

Dark septate endophytes: a review of facultative biotrophic root‐colonizing fungi

1998

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“…It colonizes a broad range of host species and habitats and is one of the most frequent, often dominant, ECM types (Trappe 1964;Horton and Bruns 2001;Richard et al 2005). This fungus lacks sexual and asexual spores, but it produces sclerotia that may be dispersed by water or animals (Massicotte et al 1992;LoBuglio et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity and differential in vitro responses to Ni in Cenococcum geophilum isolates from serpentine soils in Portugal

et al. 2007

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Amplified fragment length polymorphism (AFLP) analysis was used to investigate the genetic diversity in isolates of the ectomycorrhizal fungus Cenococcum geophilum from serpentine and non-serpentine soils in Portugal. A high degree of genetic diversity was found among C. geophilum isolates; AFLP fingerprints showed that all the isolates were genetically distinct. We also assessed the in vitro Ni sensitivity in three serpentine isolates and one non-serpentine isolate. Only the nonserpentine isolate was significantly affected by the addition of Ni to the growth medium. At 30 μg g −1 Ni, radial growth rate and biomass accumulation decreased to 73.3 and 71.6% of control, respectively, a highly significant inhibitory effect. Nickel at this concentration had no significant inhibitory effect on serpentine isolates, and so the fitness of serpentine isolates, as evaluated by radial growth rate and biomass yield, is likely unaffected by Ni in the field. In all isolates, the Ni concentration in the mycelia increased with increasing Ni concentration in the growth medium, but two profiles of Ni accumulation were identified. One serpentine isolate showed a linear trend of Ni accumulation. At the highest Ni exposure, the concentration of Ni in the mycelium of this isolate was in the hyperaccumulation range for Ni as defined for higher plants. In the remaining isolates, Ni accumulation was less pronounced and seems to approach a plateau at 30 μg g −1 Ni. Because two profiles of Ni accumulation emerged among our Ni-insensitive serpentine isolates, this result suggests that different Ni detoxification pathways may be operating. The nonserpentine isolate whose growth was significantly affected by Ni was separated from the other isolates in the genetic analysis, suggesting a genetic basis for the Ni-sensitivity trait. This hypothesis is further supported by the fact that all isolates were maintained on medium without added Ni to avoid carry-over effects. However, because AFLP analysis failed to distinguish between serpentine and non-serpentine isolates, we cannot conclude that Ni insensitivity among our serpentine isolates is due to evolutionary adaptation. Screening a larger number of isolates, from different geographical origins and environments, should clarify the relationships between genetic diversity, morphology, and physiology in this important species.

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“…A phylogenetic analysis of C. geophilum by nuclear small subunit ribosomal RNA analysis revealed that this fungus is a lineage of ascomycetes (LoBuglio et al, 1996). As proliferating hyphae of ascomycetes are usually haploid, the C. geophilum mycelium may also consist of haploid cells.…”

Section: Discussionmentioning

confidence: 99%

“…Worldwide molecular surveys of C . geophilum isolates conducted to understand the genetic diversity of this common and functional ECM fungus have revealed its significant and unexpectedly high genetic diversity (LoBuglio et al ., 1991(LoBuglio et al ., , 1996Shinohara et al ., 1999;Panaccione et al ., 2001;Jany et al ., 2002;LoBuglio & Taylor, 2002). Using RAPD, PCR /RFLP of the rDNA internal transcribed spacer (ITS), and other molecular analyses, Jany et al .…”

Section: Introductionmentioning

confidence: 99%

Genetic structure of Cenococcum geophilum populations in primary successional volcanic deserts on Mount Fuji as revealed by microsatellite markers

Nara

Hogetsu

2004

New Phytologist

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Summary• Polymorphic simple sequence repeat (SSR) markers were used to investigate the genetic structure in a Cenococcum geophilum population associated with Salix reinii in an early successional volcanic desert at Gotenba, on the south-eastern slope of Mount Fuji in Japan, and in three other populations associated with the same host at more developed sites on the mountain, one at Fujinomiya and two at Subashiri.• The genotype richness of C . geophilum tended to be higher in more developed vegetation patches as well as in more developed sites, suggesting that genotype richness increased with advanced succession because new genotypes might have been introduced into these sites over time.• High genotypic similarity was observed between the Gotenba and Fujinomiya populations but not between the Gotenba and Subashiri populations, suggesting that C . geophilum genotypes in Gotenba were introduced from the direction of Fujinomiya.• Genotypes in the Gotenba population were clearly distinguishable into two groups. The absence of any intermediate genotype suggests the absence of frequent recombination in this C . geophilum population associated with early successional vegetation.

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Phylogenetic Origins of the Asexual Mycorrhizal SymbiontCenococcum geophilumFr. and Other Mycorrhizal Fungi among the Ascomycetes

Cited by 92 publications

References 8 publications

Dark septate endophytes: a review of facultative biotrophic root‐colonizing fungi

Dark septate endophytes: a review of facultative biotrophic root‐colonizing fungi

Genetic diversity and differential in vitro responses to Ni in Cenococcum geophilum isolates from serpentine soils in Portugal

Genetic structure of Cenococcum geophilum populations in primary successional volcanic deserts on Mount Fuji as revealed by microsatellite markers

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