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    Wyświetlanie 1-7 z 7
    Tytuł:
    Natural hybridization between Elymus repens and Elymus hispidus assessed by AFLP analysis
    Autorzy:
    Szczepaniak, M
    Cieslak, E.
    Bednarek, P.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/58862.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    pollen fertility
    Polska
    hybridization
    hybrid
    botany
    flora
    new species
    Elymus x mucronatus
    Elymus hispidus
    Elymus repens
    genetic variation
    Opis:
    Hybrid speciation within the genus Elymus is analyzed and discussed. The supposed hybrid origin of Elymus x mucronatus between Elymus repens and Elymus hispidus was tested. In this aim, pollen viability and AFLP variation of putative progenitors and progenies from two natural populations were studied. Pollen fertility of hybrids ranging from 0 to 91.95% (average 59.50%) indicates the occurrence of F1 hybrids and backcross hybrids. Seven EcoRI/MseI AFLP primer combinations generated a total of 477 AFLP fragments (300 polymorphic) for 48 parental and hybrid individuals. UPGMA and principal coordinates analysis of the AFLP data set show that hybrids are closer to E. hispidus than to E. repens and suggest unidirectional introgression towards E. hispidus. AFLP fragments of the hybrid taxon were additively inherited from the parental species and no hybrid-specific bands were identified. AFLP analysis validates the hybrid status of E. ×mucronatus. Populations in which E. repens, E. hispidus and their hybrids co-occur still progress from early hybridization stages of F1 hybrids to an advanced hybridization stage of a well-established hybrid swarm. E. ×mucronatus is potentially self-sustaining by predominant vegetative reproduction by rhizomes and partial fertility leading to the development of mature seeds. We propose to consider Elymus ×mucronatus as a new species of hybrid origin in the Polish flora.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2007, 76, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phylogenetic analysis and genetic structure of new isolates of Tomato mosaic virus in Iran
    Autorzy:
    Rakhshandehroo, F.
    Hashemi, S.S.
    Shahraeen, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/961661.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phylogenetic analysis
    genetic structure
    new isolate
    tomato mosaic virus
    genetic differentiation
    genetic variation
    phylogenetic tree
    Tobamovirus
    Iran
    Opis:
    The present report describes the new occurrence of Tomato mosaic virus (ToMV) in cabbage, bean and Malva neglecta plants in Iran. In this study, sequence analyses of a partial RNA dependent RNA polymerases (RdRp) and complete movement protein (MP) and the coat protein (CP) nucleotide sequences of three new ToMV isolates collected from major crop fields in Iran revealed low genetic variation of RdRp gene compared to the CP and MP genes. The different topologies of the phylogenetic trees constructed, using available open reading frame (ORF1), ORF2 and ORF3 sequences from ToMV isolates, indicated different evolutionary constraints in these genomic regions. Statistical analysis also revealed that with the exception of CP other tested ToMV genes were under negative selection and the RdRp gene was under the strongest constraints. According to the phylogenetic tree it can be inferred from the nucleotide sequences of the complete CP and MP genes, that isolates from Iran and Egypt formed separate groups, irrespective of host origin. However, isolates clustered into groups with correlation to geographic origin but not the host. Analysis of the Ks*, Z* and Snn values also indicated genetic differentiation between ToMV populations. The Tajima’s D, Fu and Li’s statistical values were significantly negative for the RdRp gene of the Asian population which suggests the sudden expansion of ToMV in Asia. Taken together, the results indicate that negative selection and genetic drift were important evolutionary factors driving the genetic diversification of ToMV.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution to the biology of ten vertiginid species
    Autorzy:
    Myzyk, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/84447.pdf
    Data publikacji:
    2011
    Wydawca:
    Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
    Tematy:
    Vertigo angustior
    Vertigo antivertigo
    Vertigo moulinsiana
    Vertigo pusilla
    Vertigo pygmaea
    Vertigo ronnebyensis
    V.ertigo substriata
    Truncatellina cylindrica
    Columella aspera
    Columella edentula
    new information
    life cycle
    snail
    land snail
    Vertiginidae
    animal reproduction
    shell variation
    vertiginid species
    habitat
    identification
    distribution
    Opis:
    Laboratory and field observations on Vertigo angustior Jeffreys, V. antivertigo (Draparnaud), V. moulinsiana (Dupuy), V. pusilla O. F. Müller, V. pygmaea (Draparnaud), V. ronnebyensis (Westerlund), V. substriata (Jeffreys), Truncatellina cylindrica (Férussac), Columella aspera Waldén and C. edentula (Draparnaud) provided new information on their life cycle. Genus Vertigo: the life span is 1–3 years, with most snails dying in the next year after hatching. The reproductive season lasts from half of May till the beginning of September; depending on the life span eggs are laid during 1–3 seasons. The number of eggs per lifetime varies widely, the maximum numbers are 55–79 in V. moulinsiana, pygmaea and ronnebyensis, 102–120 in V. angustior, pusilla and substriata and 218 in V. antivertigo. Most eggs are laid at the stage of one cell (even oocyte II), but in some the advancement of development indicates retention of 1–3 days. Hatching usually starts in the second half of June and lasts till the second half of September. Only some of the snails reach maturity in the year of hatching, usually after the reproductive season. Genus Truncatellina: in the wild the life span of most individuals is about one year, some live till the age of about two years. Eggs are laid from half of June till the end of August (in laboratory maximum 11 eggs); hatching takes place from July till the end of September. Genus Columella: in the laboratory C. aspera lays eggs from half of May till the beginning of September (maximum 5 eggs); hatching starts at half of June and continues till the end of September. C. edentula in the laboratory lays eggs at half of April, and juveniles hatch at the end of May and beginning of June.
    Źródło:
    Folia Malacologica; 2011, 19, 2
    1506-7629
    Pojawia się w:
    Folia Malacologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Titanosaur trackways from the Late Cretaceous El Molino Formation of Bolivia (Cal Orck’o, Sucre)
    Autorzy:
    Meyer, C. A.
    Marty, D.
    Belvedere, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/973710.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    track morphotypes
    sauropods
    new ichnogenus
    quadrupedal
    trackway gauge variation
    Opis:
    The Cal Orck’o tracksite is exposed in a quarry wall, approximately 4.4 km NW of Sucre (Department Chuquisaca, Bolivia) in the Altiplano/Cordillera Oriental, in the El Molino Formation (Middle Maastrichtian). Fossiliferous oolitic limestones, associated with large, freshwater stromatolites and nine levels of dinosaur tracks in the El Molino Formation document an open lacustrine environment. The main track-bearing level is almost vertical with a surface area of ~ 65,000 m2. The high-resolution mapping of the site from 1998 to 2015 revealed a total of 12,092 individual dinosaur tracks in 465 trackways. Nine different morphotypes of dinosaur tracks have been documented. Amongst them are several trackways of theropods, ornithopods, ankylosaurs and sauropods, with the latter group accounting for 26% of the trackways. Two different types of sauropod trackways are present. One exhibits speech-bubble-shaped manus impressions that are rotated outwardly and located more outwards than pes prints, and oval to rounded pes imprints with few details, but with a characteristic oval track shape. The second morphotype has more rounded and axially compressed pes imprints and horseshoe-like manus impressions. The manus shows clear impressions of digits I and V The first morphotype with the more rounded manus can be attributed to a derived titanosaur. The second is assigned to the new ichnogenus Calorckosauripus and was probably made by a basal titanosaur. Both sauropod morphotypes exhibit a narrow-gauge and a wide-gauge stance along the same trackway, and therefore the authors suggest that trackway width may not be correlated, or may not be correlated completely with the osteological characters of the trackmaker’s skeleton.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2018, 88, 2; 223-241
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mieszaniec owsa uprawnego z dzikim gatunkiem Avena macrostachya jako nowe źródło zmienności do poprawy jakości plonu owsa nagoziarnistego
    A hybrid of cultivated oat with the wild species Avena macrostachya as a source of new variation for yield quality improvement in naked oats
    Autorzy:
    Łapiński, Bogusław
    Nita, Zygmunt
    Szołkowska, Aleksandra
    Wieczorek, Patrycja
    Powiązania:
    https://bibliotekanauki.pl/articles/2198595.pdf
    Data publikacji:
    2013-12-31
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    Avena macrostachya
    MTZ
    nowa zmienność
    owies nagi
    włókno pokarmowe
    zawartośc białka
    ziarno oplewione
    dietary fibre
    grain protein
    husked grain
    new variation
    TKM
    yield
    Opis:
    Ród 5T8.33 otrzymany jako mieszaniec owsa ozimego z Avena macrostachya był badany w doświadczeniach polowych na poletkach 5 m2 , w czterech miejscowościach, w latach 2012 i 2013. W porównaniu z wzorcową odmianą Siwek ród miał lepsze średnie oceny kilku istotnych cech. Łączył w sobie wysokie i stabilne wartości masy tysiąca ziaren (MTZ = 32,7 g, 139,2% wzorca), zawartości w ziarnie białka (18,8%, 112% wzorca) i stosunkowo wysokiej zawartości włókna (7,0%, 117,9% wzorca) ze znacznie mniejszym udziałem w plonie ziarna oplewionego (4,0% w stosunku do 16,9% u wzorca) i z dobrą odpornością na wyleganie i rdzę koronową. W przeciwieństwie do odmiany wzorcowej, wysokie parametry jakości plonu nie były negatywnie skorelowane z plonem. Potencjał plonowania był również wysoki, ale stabilność plonowania niska. Dyskutowana jest przydatność rodu jako źródła nowej zmienności dla hodowli owsa.
    The naked oat strain 5T8.33, derived from wide crosses between winter oats and Avena macrostachya, was investigated in field trials, on 5 m2 plots, in four locations, in the years 2012 and 2013. In relation to the standard naked oat cultivar Siwek the strain showed better average scores for several important characters. High and stable values of thousand kernels mass (TKM = 32.7 g, 139.2% of the standard), grain protein content (18.8%, 112% of the standard), dietary fibre content (7.0%, 117.9% of the standard), resistances to lodging and to crown rust were combined with low contamination with husked grain (4.0% in relation to 16.9% in the standard). Contrary to the Siwek cultivar, the high grain quality parameters were not negatively correlated with yield. The yield potential was also high, but its stability was low. Usefulness of the strain as a source of new variation is discussed for application in oat breeding.
    Źródło:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin; 2013, 270; 43-54
    0373-7837
    2657-8913
    Pojawia się w:
    Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New method for soil surface darkening for increasing soil temperature
    Autorzy:
    Azadegan, B.
    Massah, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/24353.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    soil surface
    soil temperature
    germination
    plant growth
    new method
    daily variation
    solar radiation
    soil colour
    soil heat
    bulk density
    soil texture
    daily temperature
    Źródło:
    International Agrophysics; 2011, 25, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of b-value variation of earthquakes in Papua New Guinea
    Autorzy:
    Abong, A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068605.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    F-ratio
    Papua New Guinea
    b-value
    earthquakes
    least squares
    temporal variation
    Opis:
    This study evaluated the b-value variation of earthquakes in Papua New Guinea region. The data used were extracted from International Seismological Centre (ISC), Pipers Lane, Thatcham, Berkshire, United Kingdom. The selected data consisted of earthquakes with Mb ≥ 2.6 for the study area from 1st January 1966 to 31st December 2015 (50 years) with focal depth from 0 – 700 km. The data were analyzed using Least Squares (LS) approximation method and SPSS Software version 20.0. The findings of this study categorized b-value into three groups: High, moderate and low. High b-value varies from 1.01 to 1.35, moderate b-value lies between 0.8 and 1.0 and low b-value varies from 0.63 to 0.80. This indicates that the years where high b-values occurred predominantly consist of many earthquakes of moderate magnitudes; slight decrease in b-value is associated with many earthquakes of large magnitudes and low b-value is associated with many earthquakes of small magnitudes. The b-value for the whole study area was calculated to be 0.91. The research hypothesis revealed that there is a significant difference in the b-value between the decade groups from 1966 to 2015. The F-ratio between the decade groups was found to be 3.776 with significant value of 0.010. The implication of this study is that temporal variation and monitoring of b-values will serve as one of the reliable ways of earthquake prediction in Papua New Guinea.
    Źródło:
    World Scientific News; 2019, 132; 155-168
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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