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Wyświetlanie 1-10 z 38
Tytuł:
Molecular phylogeny of subgenus Polypompholyx (Utricularia; Lentibulariaceae) based on three plastid markers : diversification and proposal for a new section
Autorzy:
Baleeiro, Paulo C.
Jobson, Richard W.
Reut, Markus S.
Opis:
Phylogenetic relationships among all of the 47 recognised species and 10 putative new taxa of Utricularia subgenus Polypompholyx, were assessed using maximum parsimony and Bayesian inference analyses of DNA sequences representing the plastid rps16 intron, trnL-F intron and spacer regions and the trnD-T intron. We found strong jackknife and posterior-probability support for a monophyletic subgenus Polypompholyx and a sister relationship between the sections Polypompholyx + Tridentaria and Pleiochasia. Within the section Pleiochasia, are two well-supported major clades, each containing three supported clades. Our S-DIVA biogeographic analysis, using five major Australian drainage basins and New Zealand as geographic areas, estimated two early vicariance events between south-western and northwestern mainland regions, corresponding with known periods of increased aridity at 15 and 6 million years ago. Subsequent dispersal events were estimated between northern and south-eastern Australia, with recent dispersal of species from south-western regions to the south-east and New Zealand occurring between 4 million and 1 million years ago. There were 28 speciation events inferred within the north-western region, followed by 9 for the south-western and south-eastern regions, indicating that the north-western monsoonal savanna habitats are a biodiversity hotspot for the lineage. We also show the evolutionary shifts in growth habit, and show that lifecycle corresponds strongly with shifts in seasonality between temperate and monsoonal regions. On the basis of our molecular phylogenetic results and morphology, we here designate a new sectional ranking for subgenus Polypompholyx.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Comparative molecular analysis of strains of the Aleutian Disease Virus isolated from farmed and wild mink
Autorzy:
Czerwonka, Maciej
Kowalczyk, Marek
Kostro, Krzysztof
Jeżewska-Witkowska, Grażyna
Tematy:
AMDV
VP2 protein
mink
molecular phylogenetics
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Wydawca:
Instytut Medycyny Wsi
Powiązania:
https://bibliotekanauki.pl/articles/989585.pdf  Link otwiera się w nowym oknie
Opis:
Introduction and objective. Aleutian Disease is a significant biological factor causing substantial losses in mink farming. The virus inducing the disease also infects wild populations which may constitute an asymptomatic reservoir. To compare genetic variants of the AMD virus occurring in wild and farmed mink populations, an analysis was performed on a fragment of the VP2 protein sequence of the virus infecting both populations, taken from different living environments. Material and method. Genetic material was isolated from 11 farmed animals in which anti-AMDV antibodies had been detected and from 20 wild animals. The DNA obtained was amplified using primers specific for the fragment encoding the VP2 protein. The product obtained was sequenced and bioinformatic analysis was performed. Results. Viral material was detected in 11 farmed and 7 free-living animals. Similarity of sequences averaged 99% within groups and 94% between groups. The sequencing results made it possible to identify characteristic changes for each group. In the isolates from the wild animals, the following changes were observed in the epitope region with respect to the reference sequence: C3704T, G3710A, T3722C, T3746C and A3749G. In the isolates from the farmed animals a G3779A transition was noted. Phylogenetic analysis showed that the variants infecting the two groups occupy separate branches of the phylogenetic tree. Conclusion. The variants of the virus infecting the two groups may have a common origin, but at present they constitute two separate groups, with characteristic differences making it possible to recognize their genotype.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tubulinosema loxostegi sp. n. (Microsporidia: Tubulinosematidae) from the Beet Webworm Loxostege sticticalis L. (Lepidoptera: Crambidae) in Western Siberia
Autorzy:
MALYSH, Julia M.
TOKAREV, Yuri S.
SITNICOVA, Natalia V.
MARTEMYANOV, Vyacheslav V.
FROLOV, Andrei N.
ISSI, Irma V.
Tematy:
Beet webworm, microsporidia, taxonomy, molecular phylogenetics, Tubulinosema
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Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763407.pdf  Link otwiera się w nowym oknie
Opis:
Adults of beet webworm Loxostege sticticalis were collected in Western Siberia in 2009 and 2010. A microsporidium was found infecting 12 of 50 moths in 2010. The parasite develops in direct contact with host cell cytoplasm, sporogony is presumably disporoblastic. The spores are ovoid, diplokaryotic, 4.2 × 2.4 μm in size (fresh), without a sporophorous vesicle. Electron microscopy showed: (a) tubules on the surface of sporoblasts and immature spores; (b) slightly anisofilar polar tube with 10–14 coils, last 2–3 coils of lesser electron density; (c) bipartite polaroplast with anterior and posterior parts composed of thin and thick lamellae, respectively; (d) an indentation in the region of the anchoring disc; (e) an additional layer of electron-dense amorphous matter on the exospore surface. The spore ultrastructure is characteristic of the genus Tubulinosema. Sequencing of small subunit and large subunit ribosomal RNA genes showed 98–99.6% similarity of this parasite to the Tubulinosema species available on Genbank. A new species Tubulinosema loxostegi sp. n. is established.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Isospora dendrocinclae n. sp. (Apicomplexa: Eimeriidae) from the Whitechinned Woodcreeper (Dendrocincla merula) from South America
Autorzy:
McQuistion, Thomas E.
Galewsky, Samuel
Capparella, Angelo P.
Rebling, Fredrick
Tematy:
Isospora dendrocinclae, Passeriformes, Dendrocolaptidae, phylogenetics, ribosomal RNA, molecular systematics
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Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763497.pdf  Link otwiera się w nowym oknie
Opis:
A new species of Isospora is described from the fecal contents of the white-chinned woodcreeper, Dendrocincla merula merula from Guyana and Dendrocincla merula barletti from Peru. Sporulated oocysts are subspherical to ovoid, 19.2 × 16.5 (15–23 × 14.5–19) μm, with a smooth, colorless, bilayered wall. The average shape index is 1.2. No micropyle or oocyst residuum are present, but the oocysts contain one polar granule. Sporocysts are ovoid, 12.9 × 8.3 (12–14 × 7–10) μm, average shape index of 1.7 with a smooth, single layered wall and composed of a small, knoblike Stieda body and a slightly larger, bubble shaped substieda body. The two sporocysts each contain a compact residuum composed of coarse, non-uniform granules and four randomly arranged, vermiform sporozoites each with a terminal refractile body and a centrally located nucleus. DNA sequences representing ITS-1 and ITS-4 regions of the 5.8S rDNA gene from the two isolates were amplified and compared. In addition to the two isolates showing similar morphological characteristics, they also had identical nucleotide sequences for the ITS-1 and ITS-4 regions of the 5.8S ribosomal gene.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A New Species of Flamella (Amoebozoa, Variosea, Gracilipodida) Isolated from a Freshwater Pool in Southern Mississippi, USA
Autorzy:
Walthall, Austin C.
Brown, Matthew W.
Tice, Alexander K.
Tematy:
Amoeboid, amoeba, SSU rDNA, taxonomy, protist, phylogenetics, Flamella, Gracilipoida
Pokaż więcej
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/763591.pdf  Link otwiera się w nowym oknie
Opis:
We isolated and identified a freshwater amoebozoan species that belongs to the genus Flamella Schaeffer, 1926 by single cell isolation and light microscopy. Our specific strain was isolated from a water sample obtained on the cover of a swimming pool in Petal, Mississippi, USA collected during the winter of 2015. Morphologically, our isolate is a fan-shaped amoeba with a large, frontal hyaloplasm and distinctive granuloplasm. It is capable of encystment and trophozoites occasionally have two nuclei. The isolate (GFP151sc) is phylogenetically sister to but unique from the freshwater environmental flamellid clone from Borok, Yaroslavl region, Russia originally published in 2006. Here we describe and place this isolate into a new species, Flamella piscinae n. sp.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phylogeny and Synonymy of Gyrodinium heterostriatum comb. nov. (Dinophyceae), a Common Unarmored Dinoflagellate in the World Oceans
Autorzy:
Gómez, Fernando
Artigas, Luis Felipe
Gast, Rebecca J.
Tematy:
Dinophyta
Gymnodinium
new combination
taxonomy
molecular phylogenetics
North Atlantic
Pokaż więcej
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:
https://bibliotekanauki.pl/articles/52062719.pdf  Link otwiera się w nowym oknie
Opis:
The North Sea and the English Channel are regions with a long tradition of plankton studies, where the colony-forming haptophyte Phaeocystis globosa dominates the spring phytoplankton blooms. Among its predators, we investigated an abundant unarmored dinoflagellate (~3000 cells per liter) in the North Sea in May 2019. It has been reported in the literature as Gymnodinium heterostriatum or G. striatissimum, and often identified as Gyrodinium spirale. Phylogenetic analyses using the small-, large subunit- and Internal Transcriber Spacers of the ribosomal RNA (SSU-, LSU-, ITS rRNA) gene sequences indicate that our isolates clustered within the Gyrodinium clade. The new sequences formed a sister group with sequences of the freshwater taxon Gyrodinium helveticum, being one of the infrequent marine-freshwater transitions in the microbial world. This isolate is the first characterized member of a clade of numerous environmental sequences widely distributed from cold to tropical seas. This common and abundant taxon has received several names due to its morphological plasticity (changes of size and shape, often deformed after engulfing prey) and the difficulty in discerning surface striation. We conclude that the priority is for the species name Gymnodinium heterostriatum Kofoid & Swezy 1921, a new name that was proposed for Gymnodinium spirale var. obtusum sensu Dogiel 1906. The species Gyrodinium striatissimum (Hulburt 1957) Gert Hansen & Moestrup 2000 and Gymnodinium lucidum D. Ballantine in Parke & Dixon 1964 (=G. hyalinum M. Lebour 1925) are posterior synonyms. We propose Gyrodinium heterostriatum comb. nov. for Gymnodinium heterostriatum.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The subgrouping of East Chadic
Autorzy:
Peust, Carsten
Tematy:
Chadic
subgrouping
genetic tree
language classification
phylogenetics
lexicostatistics
Pokaż więcej
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:
https://bibliotekanauki.pl/articles/55788615.pdf  Link otwiera się w nowym oknie
Opis:
A genetic subgrouping of 16 East Chadic languages is proposed in this paper. Contrary to the popular lexicostatistical approach, and in order to take into account potentially different rates of lexical evolution in the individual languages, it is attempted here to rely on the identification of common innovations. A practical method is presented how to apply the notion of common innovation when working with lexical isoglosses. This new method can also serve as a model for the subgrouping of language families other than East Chadic.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 38

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