Phylogenetic relationships among ascomycetous truffles and the true and false morels inferred from 18S and 28S ribosomal DNA sequence analysis

O’Donnell, Kerry; Cigelnik, Elizabeth; Weber, Nancy S.; Trappe, James M.

doi:10.1080/00275514.1997.12026754

Cited by 168 publications

(88 citation statements)

References 39 publications

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“…The molecular positioning of L. carthusianum (syn. Picoa carthusiana) within the Morchellaceae-Discinaceae lineage, proposed in this study, corroborates earlier morphological and ecological data and confirms the exclusion of this species from the genus Picoa (O'Donnell et al 1997). An ultra-structural study of L. carthusianum performed by Li (1997) showed that this species is characterized by lemonshaped and multinucleated ascospores.…”

Section: Discussionsupporting

confidence: 92%

“…P. carthusiana, originally described by Tulasne and Tulasne (1862), was reassigned to Leucangium carthusianum by Trappe (1971) based on ascocarp differences with P. juniperi. Morphological and molecular data have provided evidence for the membership of L. carthusianum within the Morchellaceae-Helvellaceae lineage (Li 1997;O'Donnell et al 1997), while its exact assignment still remains uncertain (Laessøe and Hansen 2007). P. pachyascus, originally described by Lange (1956), was recently documented as a synonym of Imaia gigantean in Morchellaceae (Kovacs et al 2008).…”

Section: Introductionmentioning

confidence: 97%

“…Preliminary large subunit (LSU) rDNA sequence data suggest a close relationship between P. juniperi and Otidea spp. within the Pyrenomataceae family (O'Donnell et al 1997). More recently, Tedersoo et al (2010) considered Picoa to be a member of the Geopora lineage, but the exact phylogenetic positions of P. juniperi and P. lefebvrei have not yet been assessed.…”

Section: Introductionmentioning

confidence: 97%

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Phylogenetic affiliation of the desert truffles Picoa juniperi and Picoa lefebvrei

Sbissi

Neffati

Boudabous

et al. 2010

Antonie van Leeuwenhoek

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The molecular phylogeny and comparative morphological studies reported here provide evidence for the recognition of the genus Picoa, an hypogeous desert truffle, in the family Pyronemataceae (Ascomycota, Pezizales). Picoa juniperi and Picoa lefebvrei were reassigned to the genus Picoa based on large subunit (LSU) sequence (28S) rDNA and internal transcribed spacer (ITS) rDNA (including the partial 18S, ITS1, ITS2, 5.8S gene, and partial 28S of the nuclear rDNA) data. Morphological studies of spores, asci, perida, and gleba revealed high similarities between P. lefebvrei and P. juniperi, thereby confirming the membership of both species in the genus Picoa. These two species were primarily distinguishable based on ascospore ornamentation.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Phylogenetic affiliation of the desert truffles Picoa juniperi and Picoa lefebvrei

Sbissi

Neffati

Boudabous

et al. 2010

Antonie van Leeuwenhoek

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“…Underground mycorrhizal Pezizales fungi, to which members of the Terfezia genus belong (Laessoe and Hansen 2007), are continually being reassessed in the wake of the development of molecular tools for phylogenetic analysis (e.g., Diez et al 2002;Ferdman et al 2005;Hansen et al 2001;Norman and Egger 1999;O'Donnell et al 1997;Percudani et al 1999;Van Tuinen et al 1998). Such tools have lately enabled the identification of new mycorrhizal species within the Pezizales (Tedersoo et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Cryptic species in the Terfezia boudieri complex

Ferdman

Sitrit

et al. 2009

Antonie van Leeuwenhoek

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Phylogenetic analyses have corroborated the discovery of three internal transcribed spacer (ITS) Types in Terfezia boudieri isolates in the course of earlier studies and have emphasized the divergence of Type 2 from Types 1 and 3. The application of molecular and physiological tools described below, revealed the existence of cryptic species within T. boudieri. The markers used include sequences taken from the 5' end of the ribosomal large subunit gene, a chitin synthase partial sequence, beta-tubulin partial sequence and amplified fragment length polymorphism (AFLP)-based markers. Following initial sequencing of a single PCR amplified sample for each Type, mass analysis of specimens relied on RFLP differences between the Types. Over 100 fruit bodies, 30 or more specimens for each ITS Type, were tested with each of the markers. The markers analysis divided the isolates into three groups, each correlated to a specific ITS Type. Two of the physiological traits examined: mycelial proliferation and mycorrhiza formation, consistently showed responses paralleling the ITS Types; the data presented suggest that T. boudieri is comprised of three cryptic species.

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“…Enough detailed descriptions of ECM are only available for Ascomycetes and Hymenomycetidae to attempt a synthesis of structural patterns and a comparison to fungal relationships, as they are presently discussed or accepted. For the following comparison between structural patterns of ECM and fungal lineages, we use for Hymenomycetidae preferentially Binder et al (2005) and Moncalvo et al (2002), and for Ascomycetes Landvik et al (1997) and O'Donnell et al (1997).…”

Section: Introductionmentioning

confidence: 99%

Fungal relationships and structural identity of their ectomycorrhizae

2006

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Aproximately 5,000-6,000 fungal species form ectomyorrhizae (ECM), the symbiotic organs with roots of predominantly trees. The contributing fungi are not evenly distributed over the system of fungi. Within Basidiomycota exclusively Hymenomycetes and within Ascomycota exclusively Ascomycetes contribute to the symbiosis. Hymenomycetes play a big part, Ascomycetes a minor role; Zygomycetes only form exceptionally ECM. Responsible for ascomycetous ECM are mostly Pezizales with their hypogeous derivatives, whereas Boletales, Gomphales, Thelephorales, Amanitaceae, Cantharellaceae, Cortinariaceae, Russulaceae, and Tricholomataceae are the most important ectomycorrhizal relationships within Hymenomycetes. ECM, as transmitting organs between soil and roots, are transporting carbohydrates for growth of mycelium and fruitbodies from roots and have to satisfy the tree's demand for water and nutrients. The latter task particularly influences the structure of ECM as nutrients are patchily distributed in the soil and saprotrophic as well as ectomycorrhizal fungi can act as strong competitors for nutrients. In focusing these requirements, ECM developed variously structured hyphal sheaths around the roots, the so-called mantles, and differently organized mycelium that emanates from the mantle, the so-called extramatrical mycelium. The mantles can be plectenchymatous consisting of loosely woven, differently arranged hyphae or they are densely packed, forming a pseudoparenchyma similar to the epidermis of leaves. The extramatrical mycelium grows either as simple scattered hyphae from the mantle into the soil or it can be united to undifferentiated rhizomorphs with a small reach or to highly organized root-like organs with vessel-like hyphae for efficient water and nutrient transport from distances of decimeters. Cystidia, sterile and variously shaped hyphal ends, possibly appropriate for preventing animal attack, in addition, can cover mantles and rhizomorphs. Although only a limited number of species could be considered, some general conclusions are possible.The genus Tuber forms needle-shaped cystidia and lacks rhizomorphs and clamps. Gomphales ECM are identified by rhizomorphs with ampullate inflations at septa of some hyphae and by oleoacanthocystidia or/and oleoacanthohyphae. Thelephoraceae reveal a great diversity of mantle structures and of extramatrical mycelium, with some additional optional characters, i.e., dark brown color, cystidia, blue granules, amyloid hyphae, or amyloid septa. Bankeraceae are mostly characterized by plectenchymatous mantles with star-like pattern and chlamydospores. Russulaceae possess smooth and hydrophilic ECM. Russula forms plectenchymatous mantles with knob-bearing cystidia, so-called russuloid cystidia, or pseudoparenchymatous mantles without cystidia. Lactarius lacks cystidia and shows laticifers within plectenchymatous or within pseudoparenchymatous mantles. The Boletales families Boletaceae, Gyroporaceae, Melanogastraceae, Paxillaceae, Rhizopogonaceae, Sclerodermataceae, and Suillaceae have...

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Phylogenetic relationships among ascomycetous truffles and the true and false morels inferred from 18S and 28S ribosomal DNA sequence analysis

Cited by 168 publications

References 39 publications

Phylogenetic affiliation of the desert truffles Picoa juniperi and Picoa lefebvrei

Phylogenetic affiliation of the desert truffles Picoa juniperi and Picoa lefebvrei

Cryptic species in the Terfezia boudieri complex

Fungal relationships and structural identity of their ectomycorrhizae

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