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    Wyświetlanie 1-8 z 8
    Tytuł:
    The effect of achene heteromorphism on progeny traits in the shaggy soldier [Galinsoga ciliata (Rafin) S. F. Blake]
    Wpływ heteromorfizmu niełupek na kiełkowanie oraz wzrost i rozwój żółtlicy owłosionej [Galinsoga ciliata (Rafin) S. F. Blake]
    Autorzy:
    Kucewicz, M.
    Gojlo, E.
    Kowalska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/27191.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    achene
    heteromorphism
    progeny
    shaggy soldier
    Galinsoga ciliata
    generative reproduction
    growth
    Opis:
    The shaggy soldier [Galinsoga ciliata (Rafin) S. F. Blake], family Asteraceae] is an invasive species that poses a growing threat to crop production. This annual plant produces heteromorphic achenes in a capitulum type inflorescence. The objective of this study was to compare selected morphological and phenological parameters and the success of generative reproduction in plants developed from peripheral and central achenes of the capitulum. The somatic variability of G. ciliata diaspores contributed to differences in the growth rates, development and fertility of the resulting populations. The progeny of central diaspores developed at a slower rate than the individuals derived from peripheral achenes, but at the end of their life cycle, the offspring of dimorphic achenes formed homogenous groups as regards height values. On average, the initial phenophases of G. ciliata plants derived from central achenes began one day later, and they entered the flowering stage eight days later than the individuals developed from peripheral seeds. At the initial growth stage (experimental day 65 to 83), the progeny of central achenes produced fewer capitula. On day 133, the individual fertility of the plants derived from central diaspores was 10% higher on average in comparison with the offspring of peripheral achenes.
    Źródło:
    Acta Agrobotanica; 2010, 63, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regeneration of Nardus stricta subalpine grasslands in the Giant Mountains [Krkonose]
    Autorzy:
    Hejcman, M
    Nezerkova, P.
    Pavlu, V.
    Gaisler, J.
    Lokvenc, T.
    Pavlu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/57507.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    generative reproduction
    grassland
    arable land succession
    regeneration
    subalpine grassland
    Giant Mountains
    Nardus stricta
    Opis:
    The origin of Nardus stricta dominated subalpine grassland (Nardo-Caricion rigidae alliance) is a frequently discussed topic in the Giant Mountains (Karkonosze in the Czech Republic). Many researchers considered them, as secondary stands arisen after Pinus mugo removal and by consequent oligotrophization of original plant communities, caused by long-term rough grazing and hay making activities without manuring. On the contrary, they are recognized as natural due to inability of generative reproduction of N. stricta and the very slow vegetative spread there. The aim of this study was to find proofs for generative reproduction of mat grass in subalpine conditions of the Giant Mountains. We identified a Pinus mugo nursery with arable land abandoned in 1956 and compared its vegetation with that of the surrounding area. Dense and homogenous sward dominated by N. stricta developed during the succession on the old arable land for 48 years, and it is an indisputable proof of generative reproduction of N. stricta there. Synthesizing historical facts on human activities in the past and the results of our contemporary vegetation analysis, we conclude that the Nardo-Caricion rigidae grassland was capable to spread relatively quickly, when agricultural activities above the upper timber line were introduced.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2005, 74, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Do small-scale gaps in calcareous grassland swards facilitate seedling establishment?
    Autorzy:
    Baba, W
    Kompala-Baba, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/57390.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    generative reproduction
    grassland
    Polska
    calcareous grassland
    gap colonization
    seedling
    phenology
    plant ecology
    germination
    Opis:
    In this study we analyzed gaps originated in different seasons of the year vs. places of close vegetation in calcareous grasslands in terms of their suitability for seedling germination and establishment. Gaps, irrespective of the time of their origin, significantly promoted seedling emergence as compared with close swards. However, the season of gap creation influenced the rate of seedling germination/emergence. Seedlings occurred more frequently in autumn and spring gaps than in the summer ones. The highest mean number of seedlings and of their species were noted in autumn openings. However, the subsequent survival of seedlings in autumn gaps was low. On the contrary, in spring gaps juveniles occurred with the significantly highest mean number, frequency and species richness. The above results pointed to the positive, although very limited role of artificially created gaps as places favouring seedlings establishment.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2005, 74, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generative reproduction and external conformation of Echinochloa crus-galli [L.] P. Beauv. plants under various density conditions
    Autorzy:
    Kucewicz, M.
    Holdynski, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/65545.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    generative reproduction
    density condition
    individual fertility
    external conformation
    population fertility
    Echinochloa crus-galli
    plant
    Źródło:
    Journal of Plant Protection Research; 2003, 43, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected aspects of tiny vetch [Vicia hirsuta (L.) Gray S.F.] seed ecology: generative reproduction and effects of seed maturity and seed storage on seed germination
    Wybrane aspekty ekologii nasion wyki drobnokwiatowej [Vicia hirsuta (L.) Gray F.S.]: reprodukcja generatywna oraz wpływ stopnia dojrzałości i warunków przechowywania na kiełkowanie nasion
    Autorzy:
    Kucewicz, M.
    Mackiewicz, K.
    Zrobek-Sokolnik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/26682.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    tiny vetch
    Vicia hirsuta
    seed ecology
    generative reproduction
    seed maturity
    seed storage
    seed germination
    Opis:
    Vicia hirsuta (L.) Gray S.F. (tiny vetch) is a common and persistent segetal weed. Tiny vetch seeds and pods reach different stages of maturity during the crop harvest season. Some seeds that mature before cereal harvest are shed in the field and deposited in the soil seed bank, while others become incorporated into seed material. The objective of this study was to describe selected aspects of tiny vetch seed ecology: to determine the rate of individual reproduction of vetch plants growing in winter and spring grain crops and to evaluate the germination of seeds at different stages of maturity, subject to storage conditions. The seeds and pods of V. hirsuta were sorted according to their development stages at harvest and divided into two groups. The first group was stored under laboratory conditions for two months. In the autumn of the same year, the seeds were subjected to germination tests. The remaining seeds were stored in a storeroom, and were planted in soil in the spring. The germination rate was evaluated after 8 months of storage. Potential productivity (developed pods and flowers, fruit buds) was higher in plants fruiting in winter wheat than in spring barley. Vetch plants produced around 17-26% more pods (including cracked, mature, greenish-brown and green pods) and around 25% less buds in winter wheat than in spring barley. Immature seeds were characterized by the highest germination capacity. Following storage under laboratory conditions and stratification in soil, mature seeds germinated at a rate of several percent. After storage in a storeroom, seeds at all three development stages broke dormancy at a rate of 72- 75%. The high germination power of tiny vetch seeds stored in a storeroom indicates that this plant can be classified as an obligatory speirochoric weed species.
    Źródło:
    Acta Agrobotanica; 2010, 63, 1
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generative reproduction efficiency and the population age structure of Rumex confertus Willd.
    Efektywnosc reprodukcji generatywnej i struktura wiekowa populacji Rumex confertus Willd.
    Autorzy:
    Stosik, T
    Powiązania:
    https://bibliotekanauki.pl/articles/26769.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    meadow
    Polska
    ruderal community
    generative reproduction
    age structure
    Rumex confertus
    reproduction efficiency
    Russian Dock
    population
    river valley
    Opis:
    Rumex confertus is one of the alien species vigorously entering native meadow as well as ruderal communities in major river valleys. In about a hundred years the species invaded almost the whole territory of Poland. Many reports stating that Russian Dock may reach high coverage in various phytocoenoses contradict those of its low generative reproduction efficiency. In communities where it most frequently occurs, germination is hindered by the lack of empty spaces. In such conditions the population size remains stable due to vegetative reproduction. Only hay-growing meadows seem to promote the influx of new genets into population, which is likely associated with vegetation cover removal and periodic reduction of competition from other species.
    Jednym z gatunków obcych, masowo wnikających do rodzimych zbiorowisk łąkowych i ruderalnych w dolinach większych rzek, jest Rumex confertus. Gatunek ten w ciągu stu lat opanował obszar niemal całej Polski. Liczne doniesienia o jego wysokim udziale w różnych fitocenozach kłócą się z informacjami o niewielkiej efektywnooeci reprodukcji generatywnej. W zbiorowiskach, w których gatunek ten najczęoeciej się spotyka kiełkowanie jest utrudnione z uwagi na brak bezpiecznych miejsc do kiełkowania. W takich warunkach liczebnooeć populacji utrzymuje się dzięki pomnażaniu wegetatywnemu. Jedynie użytkowane rolniczo łąki wydają się sprzyjać dopływowi nowych genetów do populacji, co zapewne związane jest z niszczeniem zwartej darni i okresowym ograniczaniem konkurencji ze strony innych gatunków.
    Źródło:
    Acta Agrobotanica; 2006, 59, 2
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of dominant species on numbers and age structure of Iris sibirica L. population on blue moor-grass meadow in Southern Poland
    Autorzy:
    Kostrakiewicz, K
    Powiązania:
    https://bibliotekanauki.pl/articles/57143.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    generative reproduction
    Iris sibirica
    clonal plant
    vegetative reproduction
    Polska
    dominant species
    age structure
    population
    blue moor-grass meadow
    seedling recruitment
    plant ecology
    Opis:
    Two populations of Iris sibirica, a clonal species protected by law in Poland, occurring in patches of Molinietum caeruleae, of similar floristic composition although with different dominant species, were studied. In the Stanisławice locality, species with a high competitive potential prevailed, contrary to the Opatkowice locality, where the species of low competitive potential dominated. It was established that vegetative propagation ensures the continued presence of populations in both localities, although the proximity of plants with high competitive potential limits the vegetative propagation of ramet clusters of Iris sibirica. Despite the high level of seed production, the recruitment of seedlings in both patches is possible only in artificially created gaps. The field observations support the conclusion that creating gaps allowing for germination of seeds and development of seedlings, as well as eliminating expansive neighbours allowing proliferation of ramet clusters of Iris sibirica, is an affective way of protecting populations of this species.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2007, 76, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of environmental factors on reproduction of polar vascular plants
    Autorzy:
    Kellmann-Sopyla, W.
    Pastorczyk, M.
    Gielwanowska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/11942.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    environmental factor
    plant reproduction
    polar plant
    vascular plant
    climate change
    generative reproduction
    warming
    flower development
    seed formation
    air temperature
    ultraviolet radiation
    reproductive phase
    vegetation
    Opis:
    In the last few decades, changes of reproductive pattern of polar vascular plants have been observed, for the benefit of generative propagation. The reasons for this phenomenon are attributed to intensively following climate change, whose effects may be various. Warming causes the production of the greater number of generative structures, with higher quality. Our macroscopic observations conducted on specimens of polar vascular plants, cultivated in University of Warmia and Mazury greenhouse, indicate that the effect of temperature increase on flower development and seed formation is inconsistent. On the other hand enhanced levels of UV-B radiation can negatively affect seedlings. The complexity of the climate change causes tremendous difficulties in defining a clear and unquestioned way of modifications during the reproductive phase of the described plants.
    Źródło:
    Papers on Global Change; 2011, 18
    2300-8121
    1730-802X
    Pojawia się w:
    Papers on Global Change
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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