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    Wyświetlanie 1-4 z 4
    Tytuł:
    Karyotype evolution of the established RES [Ren Embryonis Suis] cell line
    Autorzy:
    Dziekanowska, D
    Scheller, S.
    Rokicka, A.
    Legowik, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048146.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pig
    cell line
    Sus scrofa
    polyploidy
    kidney
    evolution
    cytogenetics
    chromosome alteration
    karyotype
    Opis:
    The present paper refers to the previously reported cytogenetic studies of a cell line derived from an embryonic pig kidney and deals with chromosome alterations suddenly and spontaneously occurring in this line as structural rearrangements and polyploidy. Successive stages of karyotype evolution, domination of abnormal karyotype and this population dynamics are described.
    Źródło:
    Journal of Applied Genetics; 1995, 36, 2; 177-185
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nuclear morphology, polyploidy, and chromatin elimination in tissue culture of Allium fistulosum L.
    Autorzy:
    Joachimiak, A
    Ilnicki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/59216.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    chromatin
    heterochromatin
    tissue culture
    polyploidy
    Alliaceae
    morphology
    Monocotyledoneae
    micronucleus
    Allium fistulosum
    Opis:
    The morphology of cell nuclei in callus obtained from root-tip meristems of Allium fistulosum L. (Monocotyledoneae, Alliaceae) was analysed. The most interesting phenomena observed in long-term callus culture were the different mechanisms of cell polyploidization, enlargement of telomeric segments of heterochromatin, and extensive chromatin elimination, associated with instability of nuclei size and DNA content. Protruding heterochromatin "spikes" were observed on the surface of some di- and polyploid nuclei. The presence of these spikes was connected with the formation of small heterochromatic micronuclei frequently found in the cytoplasm. It is suggested that these micronuclei are produced by direct elimination of heterochromatin from the interphase nuclei. Polyploid cells accumulated with each successive cell collection. The ploidy level attained by highly polyploid cells was 15C-220C. The shape of the nuclei and heterochromatin distribution suggest that polyploid nuclei in A. fistulosum tissue culture are produced by endoreduplication and by restitution cycles.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2003, 72, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of a heavy-metal-polluted environment on Viola tricolor genome size and chromosome number
    Autorzy:
    Slomka, A.
    Siwinska, D.
    Wolny, E.
    Kellner, K.
    Kuta, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/19133.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy metal
    polluted environment
    environment pollution
    Viola tricolor
    genome size
    chromosome number
    aneuploidy
    polyploidy
    pseudometallophyte
    Opis:
    Intraspecific changes in genome size and chromosome number lead to divergence and species evolution. Heavy metals disturb the cell cycle and cause mutations. Areas contaminated by heavy metals (metalliferous sites) are places where microevolutionary processes accelerate; very often only a few generations are enough for a new genotype to arise. This study, which continues our long-term research on Viola tricolor (Violaceae), a species occurring on both metalliferous (Zn, Pb, Cd, Cu) and non-metalliferous soils in Western and Central Europe, is aimed at determining the influence of environments polluted with heavy metals on genome size and karyological variability. The genome size of V. tricolor ranged from 3.801 to 4.203 pg, but the differences between metallicolous and non-metallicolous populations were not statistically significant. Altered chromosome numbers were significantly more frequent in material from the polluted sites than from the non-polluted sites (43% versus 28%). Besides the standard chromosome number (2n = 26), aneuploid cells with lower (2n = 18–25) or higher (2n = 27, 28) chromosome numbers were found in plants from both types of site, but polyploid (2n = 42) cells were observed only in plants from the metalliferous locality. The lack of correlation between chromosome variability in root meristematic cells and genome size estimated from peduncle cells can be attributed to elimination of somatic mutations in generative meristem, producing chromosome-stable non-meristematic tissues in the peduncle.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2011, 53, 1
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seed vigor, photosynthesis and early growth of saplings of different triploid Betula families
    Autorzy:
    Mu, H.
    Jiang, J.
    Li, H.
    Liu, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/41671.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    seed vigor
    photosynthesis
    early growth
    sapling
    triploid
    Betula
    birch
    polyploidy
    European aspen
    aspen
    Populus tremula
    germination energy
    Opis:
    Breeding scientists have given extensive attention to triploids in trees because of their importance to forestry. Consequently, creating and breeding triploids of good quality has become one of purposes of tree breeding. We chose two autotetraploids (Betula platyphylla, named Q10 and Q65) as female parents and eight hybrid diploids (B. platyphylla × B. pendula, named F1 – F8) as male parents to obtain progenies through controllable pollination, resulting in triploid progenies. Germination rate and germination energy of triploid seeds of Q65 were significantly higher (P < 0.01) than in triploid seed s of Q10. Triploid families with Q65 as female parent had a large quantity of saplings, whereas triploid families with Q10 as female parent had a small quantity of saplings. Triploid families with Q65 as female parent were generally superior in base diameter and height to base diameter ratio when compared to a diploid family. Q65×F3 was preliminarily recognized as the superior family. These results demonstrate that the female parent has a major influence on triploid progenies, although the male parent also has a small influence. The results provided a reference to build seed orchards of triploid birch trees, choose tetraploids as female parents and forecast triploid families of good quality.
    Źródło:
    Dendrobiology; 2012, 68
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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