Some Problems in the Structural Elucidation of Fungal Metabolites

Steglich, Wölfgang; Steffan, Bert; Eizenhöfer, Thomas; Fugmann, Burkhard; Herrmann, Rupert; Klamann, Jörg-Dieter

doi:10.1002/9780470514009.ch5

Cited by 1 publication

(2 citation statements)

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“…The metabolites infer good phylogenetic signals for the clades and species at hand, but their diverse chemical nature and erratic occurrence indicate that they have evolved several independent times via different biosynthetic pathways; probably as a response to environmental conditions. The bitter taste due to the alkaloids in C. infractus and C. subtortus may protect the basidiocarps from being eaten, since animals usually avoid this (Steglich et al 1990, Spiteller 2008. The same applies to the non-nitrogen compound crystallopicrin in C. vibratilis.…”

Section: Secondary Chemistrymentioning

confidence: 98%

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Phylogenetic relationships in Cortinarius with focus on North European species

Stensrud¹,

Reier-Røberg²,

Schumacher³

et al. 2014

Karstenia

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IntroductionCortinarius (Pers.) Gray is a genus of Agaricales (Basidiomycota) characterised by a fugacious veil enveloping the basidiocarp, and a cortina at first covering the lamellae, but later vanishing in expanding basidiocarps. The basidiocarp size, shape, and colour vary considerably among species. The lamellae are emarginate to adnate, variously coloured, soon becoming brownish from mature, brown-pigmented basidiospores. The basidiospores are usually verrucose, highly variable Cortinarius is an ectomycorrhizal Agaricales genus with high diversity of which rDNA sequences of 86 species together with four outgroup taxa were investigated phylogenetically by aid of Maximum Likelihood and Bayesian analyses. The Cortinarius data set represents 81 taxa from the Northern Hemisphere showing the main variation spectrum among the species. In addition, five species from the Southern Hemisphere are included. The phylogenetic tree of Cortinarius gives statistical support to twelve monophyletic groups in the upper level. They are discussed in context of morphology, chemistry (secondary compounds), and ecology. The phylogenetic tree lacks, however, satisfactory support for its backbone. Several species could not be included in any group, especially those forming the basal framework of the tree. Of special interest is a "superclade" comprising eight of our monophyletic clades and two singletons. Here we find the majority of species with soluble pigments of octaketide origin, all species with compounds of nonaketide origin, the majority of species with hygrophaneous pileus, few species with viscid pileus, and no species with bulbous stipe base. Moreover, all species except one have duplex pileus cuticle. The morphological traits are not indicative for any clade, although some are more frequent in some clades than others. During the evolution they have been gained and lost several times. The chemical characteristics are -to a certain degree -more indicative for the clades. The evolution and ecological role of these compounds are discussed. Concerning the North European species, there are ecological differences between the clades, especially between clades specializing to rich or calcareous forests and clades specializing to poor forests or arctic-alpine environments.

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Section: Secondary Chemistrymentioning

confidence: 98%

“…1). For instance, the viscid pileus cuticle of C. vibratilis contains the intensely acrid triterpenoid crystallopicrin (Steglich et al 1990). The most basal position is taken by the unsupported couple C. renidens (characterised by lacking veil and cortina) and the South American Nothofagus associated species C. austroduracinus.…”

Section: Phylogenymentioning

confidence: 99%