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Morphological characterization and phylogeny of pythium and related genera in rayong province, thailand
(2021-01-01)
Saelee, Rattasit
;
Busarakam, Kanungnid
;
Koohakan, Prommart
Most well-known microorganisms in the class Oomycetes (notably genera Phytophthora and Pythium) are pathogenic to both animals and plants due to their diverse lifestyle patterns. This study was designed to recover Pythium from composite soils (cultivated and forest soils) and water sources (fresh and brackish water) from Rayong Province. Twenty isolates of hyaline and non-septate fungal-like organisms were isolated from those sources. The primer pair ITS4 and ITS6 were used to amplify approximately 900 bp products from Internal transcribed spacer (ITS) region and morphological characteristics including sporangium, oogonium, antheridium and oospore, were noted. Morphological characteristics data of recovered Pythium strain can be classified into 12 source groups. ITS sequencing results revealed that eight closely related species had been recovered: Globisporangium splendens, Pythium cucurbitacearum, Pythium acanthichum, Pythium deliense, Pythium diclinum, Pythium torulosum, Phytopythium vexans and Phytopythium helicoides, which had similarities in the range 94.67-100% values at between 656 and 922 locations. Most of these species were reported as plant pathogens. Therefore, this report can be used as a guide for disease control planning.
2
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Agaricus flocculosipes sp. nov., a new potentially cultivatable species from the palaeotropics
(2012-01-01)
Zhao, Rui Lin
;
Hyde, Kevin D.
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Desjardin, Dennis E.
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Raspé, Olivier
;
Soytong, Kasem
Agaricus flocculosipes is described as new from northern Thailand and Mayotte based on morphology and ITS sequence analysis. The new species is compared with similar taxa, and a comprehensive description, line drawings, and colored photographs are provided. Agaricus flocculosipes is distinguished among the species in section Arvenses by its relatively large sporocarps (110-180 mm in diameter), erect floccose squamules on the surface of the stipe, and relatively small basidiospores (less than 6.5 μm long). Phylogenetic analyses based on ITS sequence data using maximum likelihood, parsimony, and Bayesian analyses all support A. flocculosipes as being a distinct species within section Arvenses. The new taxon is potentially cultivatable as it is presumably heterothallic, exhibits extensive genetic diversity, and occurs in section Arvenses, a lineage that contains other edible cultivatable taxa such as Agaricus arvensis and Agaricus subrufescens. © 2012 The Mycological Society of Japan and Springer.
1
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Sutorius: A new genus for Boletus eximius
(2012-01-01)
Halling, Roy E.
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Nuhn, Mitchell
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Fechner, Nigel A.
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Osmundson, Todd W.
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Soytong, Kasem
Sutorius is described as a new genus of Boletaceae to accommodate Boletus robustus originally named illegitimately by C.C. Frost from eastern North America. The legitimate name, Boletus eximius, provided by C.H. Peck, has been used since for a dark purple to chocolate brown bolete with finely scaly stipe and reddish brown spore deposit. This iconic taxon has been documented on five continents. Despite the straightforward species identification from morphology, the interpretation of stipe macromorphology and spore color has led to equivocal generic placement. Phylogenetic analyses of genes encoding large subunit rRNA and translation elongation factor 1a confirm Sutorius as a unique generic lineage in the Boletaceae. Two species are recognized based on multiple accessions: S. eximius, represented by collections from North America, Costa Rica, Guyana, Indonesia and Japan (molecular data are lacking for only the Guyanan and Japanese material); and S. australiensis, represented by material from Queensland, Australia. Additional collections from Zambia and Thailand represent independent lineages, but sampling is insufficient to describe new species for these entities. © 2012 by The Mycological Society of America.
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A new species of bird's nest fungi: Characterisation of Cyathus subglobisporus sp. nov. based on morphological and molecular data
(2008-12-01)
Zhao, R. L.
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Desjardin, D. E.
;
Soytong, K.
;
Hyde, K. D.
Recent collections of bird's nest fungi (i.e. Crucibulum, Cyathus, Mycocalia, Nidula, and Nidularia species) in northern Thailand resulted in the discovery of a new species of Cyathus, herein described as C. subglobisporus. This species is distinct by a combination of ivory-coloured fruiting bodies covered with shaggy hairs, plications on the inner surface of the peridium and subglobose basidiospores. Phylogenetic analyses based on ITS and LSU ribosomal DNA sequences using neighbour-joining, maximum likelihood and weighted maximum parsimony support Cyathus subglobisporus as a distinct species and sister to a clade containing C. annulatus, C. renweii and C. stercoreus in the Striatum group. © 2008 Nationaal Herbarium Nederland Centraalbureau voor Schimmelcultures.
1
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Advances in the phylogenesis of Agaricales and its higher ranks and strategies for establishing phylogenetic hypotheses
(2008-10-15)
Zhao, Rui Lin
;
Desjardin, Dennis E.
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Soytong, Kasem
;
Hyde, Kevin D.
We present an overview of previous research results on the molecular phylogenetic analyses in Agaricales and its higher ranks (Agaricomycetes/ Agaricomycotina/Basidiomycota) along with the most recent treatments of taxonomic systems in these taxa. Establishing phylogenetic hypotheses using DNA sequences, from which an understanding of the natural evolutionary relationships amongst clades may be derived, requires a robust dataset. It has been recognized that single-gene phylogenies may not truly represent organismal phylogenies, but the concordant phylogenetic genealogies from multiple-gene datasets can resolve this problem. The genes commonly used in mushroom phylogenetic research are summarized. © Zhejiang University and Springer-Verlag GmbH 2008.

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