Description of Allocanariomyces and Parachaetomium, two new genera, and Achaetomium aegilopis sp. nov. in the Chaetomiaceae

Abstract We describe Allocanariomyces tritici gen et sp. nov. and Achaetomium aegilopis sp. nov. as seed endophytes of wheat and its poaceous relatives in the west and northwestern provinces of Iran using morphological traits and sequences of ITS region, partial LSU rDNA, β-tubulin and the second largest subunit of DNA-directed RNA polymerase II genes. Chaetomium iranianum, C. truncatulum and C. carinthiacum are also combined here under the new genus, Parachaetomium. Allocanariomyces is differentiated from the closest genus, Canariomyces by having solitary, glabrous perithecia with walls of textura epidermoidea, stalked asci, densely granular-ornamented ascospores with a distinct subapical germ pore, and producing only solitary conidia. Parachaetomium has fusiform or navicular ascospores not bilaterally flattened, compared to Chaetomium with limoniform to globose, bilaterally flattened ascospores. Achaetomium aegilopis is mainly distinguished from A. strumarium, the closest relative, by possessing brown, often scattered perithecia, hyaline perithecial hairs covered with many hyaline crystals, hyaline chlamydospores, and lacking of the asexual morph.

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Taxonomy and phylogeny of Postia.Multi-gene phylogeny and taxonomy of the brown-rot fungi: Postia (Polyporales, Basidiomycota) and related genera

Persoonia - Molecular Phylogeny and Evolution of Fungi ◽

10.3767/persoonia.2019.42.05 ◽

2019 ◽

Vol 42 (1) ◽

pp. 101-126 ◽

Cited By ~ 14

Author(s):

L.L. Shen ◽

M. Wang ◽

J.L. Zhou ◽

J.H. Xing ◽

B.K. Cui ◽

...

Keyword(s):

Rna Polymerase ◽

Rna Polymerase Ii ◽

Dna Sequences ◽

Large Subunit ◽

Elongation Factor ◽

Brown Rot ◽

Small Subunit ◽

Rrna Gene ◽

New Genera ◽

Brown Rot Fungi

Phylogenetic and taxonomic studies on the brown-rot fungi Postia and related genera, are carried out. Phylogenies of these fungi are reconstructed with multiple loci DNA sequences including the internal transcribed spacer regions (ITS), the large subunit (nLSU) and the small subunit (nSSU) of nuclear ribosomal RNA gene, the small subunit of mitochondrial rRNA gene (mtSSU), the translation elongation factor 1-α gene (TEF1), the largest subunit of RNA polymerase II (RPB1) and the second subunit of RNA polymerase II (RPB2). Ten distinct clades of Postia s.lat. are recognized. Four new genera, Amaropostia, Calcipostia, Cystidiopostia and Fuscopostia, are established, and nine new species, Amaropostia hainanensis, Cyanosporus fusiformis, C. microporus, C. mongolicus, C. piceicola, C. subhirsutus, C. tricolor, C. ungulatus and Postia sublowei, are identified. Illustrated descriptions of the new genera and species are presented. Identification keys to Postia and related genera, as well as keys to the species of each genus, are provided.

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New taxa in Glomeromycota: Polonosporaceae fam. nov., Polonospora gen. nov., and P. polonica comb. nov.

Mycological Progress ◽

10.1007/s11557-021-01726-4 ◽

2021 ◽

Vol 20 (8) ◽

pp. 941-951

Author(s):

Janusz Błaszkowski ◽

Piotr Niezgoda ◽

Edward Meller ◽

Paweł Milczarski ◽

Szymon Zubek ◽

...

Keyword(s):

Rna Polymerase ◽

Rna Polymerase Ii ◽

New Taxa ◽

Internal Transcribed Spacer ◽

New Genus ◽

Phylogenetic Analyses ◽

Large Subunit ◽

Small Subunit ◽

Worldwide Distribution ◽

New Family

AbstractPhylogenetic analyses of sequences of the nuc rDNA small subunit (18S), internal transcribed spacer (ITS1-5.8S-ITS2 = ITS), and large subunit (28S) region (= 18S-ITS-28S), as well as sequences of this region concatenated with sequences of the largest subunit of RNA polymerase II (RPB1) gene, proved that the species originally described as Acaulospora polonica (phylum Glomeromycota) represents a new genus and a new family of the ancient order Archaeosporales, here introduced into the Glomeromycota under the names Polonospora and Polonosporaceae, respectively. The phylogenetic analyses and BLASTn queries also indicated that the Polonosporaceae with P. polonica comb. nov. still contains several morphologically undescribed taxa at the ranks of genus and species, which have a worldwide distribution.

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Nutrient-regulated gene expression in eukaryotes

Biochemical Society Symposium ◽

10.1042/bss0730085 ◽

2006 ◽

Vol 73 ◽

pp. 85-96 ◽

Cited By ~ 8

Author(s):

Richard J. Reece ◽

Laila Beynon ◽

Stacey Holden ◽

Amanda D. Hughes ◽

Karine Rébora ◽

...

Keyword(s):

Gene Expression ◽

Rna Polymerase ◽

Rna Polymerase Ii ◽

Transcriptional Control ◽

Direct Interaction ◽

Signalling Pathways ◽

A Cell ◽

One Step ◽

Higher Eukaryotes ◽

Regulated Gene Expression

The recognition of changes in environmental conditions, and the ability to adapt to these changes, is essential for the viability of cells. There are numerous well characterized systems by which the presence or absence of an individual metabolite may be recognized by a cell. However, the recognition of a metabolite is just one step in a process that often results in changes in the expression of whole sets of genes required to respond to that metabolite. In higher eukaryotes, the signalling pathway between metabolite recognition and transcriptional control can be complex. Recent evidence from the relatively simple eukaryote yeast suggests that complex signalling pathways may be circumvented through the direct interaction between individual metabolites and regulators of RNA polymerase II-mediated transcription. Biochemical and structural analyses are beginning to unravel these elegant genetic control elements.

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