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    Wyświetlanie 1-8 z 8
    Tytuł:
    Evaluation of Wheat (Triticum Aestivum, L.) Seed Quality of Certified Seed and Farm- Saved Seed in Three Provinces of Iran
    Autorzy:
    Khazaei, Fardin
    AghaAlikhani, Majid
    Mobasser, Samad
    Mokhtassi-Bidgoli, Ali
    Asharin, Hesam
    Sadeghi, Hossein
    Powiązania:
    https://bibliotekanauki.pl/articles/2199663.pdf
    Data publikacji:
    2016-06-20
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    germination indices
    seed production system
    vigor
    weed seed dispersal
    winnowing
    Opis:
    The objective of this study was to study the seed quality aspects of wheat (Triticum aestivum L.) and the extent of weed seed contamination present in wheat seeds produced in different regions of Iran. Four districts (cities), each including 12 fields (six certified seed fields and six farm-saved seed fields), were selected in each regions (provinces). One kilogram of the wheat seed sample was collected from each field for analysis in the laboratory. Wheat seeding was commonly done by farm-saved seed sourced from within the farm due to the high costs of certified seeds purchased from outside sources, followed by the low seed quality. The use of a farm-saved seed resulted in a higher germination rate and a lower mean time to germination compared with another system. The more positive temperatures experienced by mother plants could decrease the number of normal seedling and seedling length vigor index. Generally there was virtually no difference about physiological quality between certified seed and farm- saved seed sector that is related to lower quality of certified seed. The certified produced seeds had the lower number of weed seed, species and genus before and after cleaning. The highest seed purity and 1000 seed weight was obtained from the certified seed production system. The need for cleaning the farm-saved seed samples before sowing is one of the important findings of this survey.
    Źródło:
    Plant Breeding and Seed Science; 2016, 73; 99-115
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors determining natural regeneration of yew (Taxus baccata L.) in the Kórnik Arboretum
    Autorzy:
    Giertych, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/41677.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    seed dispersal
    Turdidae
    environmental factor
    natural regeneration
    yew
    Taxus baccata
    Sitta europea
    regeneration
    Kornik Arboretum
    Opis:
    All yew plants in the Kórnik Arboretum have been plotted onto maps of individual sectors and analysed with respect to location category (“near trunk”, “under canopy”, “in the open”), size (assumed to reflect age), genus of tree associated with in the “near trunk” category and environmental factors characterising the respective Arboretum sectors. There is practically no regeneration “in the open” (0.2%), most of it 82.5% is “under canopy” and only 17.3% “near the trunk”. It is assumed that thrushes (Turdidae) are primarily responsible for regeneration in the under canopy category (endozoochoria) and nuthatches (Sitta europea L.) in the near trunk category (synzoochoria). Under canopy regeneration exists in all size classes while near the trunk there is a distinct decline in the number of yew plants with increase in size (age) suggesting that conditions for further development there are less favourable. Nutchatches disperse yew seeds in the vicinity of mother plants, for cleaning them preferring trees to shrubs and particularly trees with smooth bark trunks (Fagus, Carpinus), however yew survival near the trunk is better under conifers. Thrushes disperse yew seed over wider areas. Survival of yews is best under loose canopies, in moderate shade, on drier well draining, low pH, soils.
    Na planach sekcji Arboretum Kórnickiego zaznaczono wszystkie cisy, wyróżniając kategorię lokalizacji („przy pniu”, „pod koroną”, „naotwa rtej przestrzeni”), rozmiar cisa (związany z wiekiem), rodzaj drzewa dlaka tegorii „przy pniu” i czynniki środowiskowe różnicujące sekcje Arboretum. Praktycznie nie ma odnowienia„ naotwa rtej przestrzeni” (0,2%), większość cisów rośnie „pod koronami” (82,5%), a tylko 17,3% „przy pniu”. Zakłada się, że głównie drozdowate (Turdidae) są odpowiedzialne za odnowienie „pod koronami” (endozoochoria), a kowaliki (Sitta europea L.) „przy pniu” (synzoochoria). „Pod koronami” jest odnowienie we wszystkich klasach wielkości (wieku), a „przy pniu” obserwuje się wyraźny spadek liczebności wraz ze wzrostem siewek, co sugeruje, że warunki rozwoju są tam gorsze. Kowaliki roznoszą nasiona cisa w pobliżu drzew matecznych, ado ich czyszczeniapreferują pnie drzew bardziej niż krzewów i to drzew o gładkiej korze (Fagus, Carpinus), cisy natomiast przeżywają lepiej „przy pniu” drzew iglastych. Drozdowate rozprowadzają nasiona na większym obszarze. Utrzymanie się odnowieniajest najskuteczniejsze pod luźnym zadrzewieniem, w niewielkim ocienieniu, na suchszych, przepuszczalnych glebach, o niskim pH.
    Źródło:
    Dendrobiology; 2000, 45
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of the flora of fallow lands on rendzina soils on the Twardowice Plateau (Silesian Upland)
    Charakterystyka flory odłogów na rędzinach Płaskowyżu Twardowickiego (Wyżyna Śląska)
    Autorzy:
    Babczynska-Sendek, B.
    Blonska, A.
    Hejdysz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/27851.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    flora
    fallow
    rendzina soil
    field
    secondary succession
    xerothermic grassland
    anthropophyte
    seed dispersal
    Twardowice Plateau
    Silesian Upland
    Źródło:
    Acta Agrobotanica; 2012, 65, 4
    0065-0951
    2300-357X
    Pojawia się w:
    Acta Agrobotanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strong potential for endozoochory by waterfowl in a rare, ephemeral wetland plant species, Astragalus contortuplicatus (Fabaceae)
    Autorzy:
    Lovas-Kiss, A.
    Sonkoly, J.
    Vincze, O.
    Green, A.J.
    Takacs, A.
    Molnar, A.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/56900.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    strong potential
    endozoochory
    waterfowl
    rare species
    wetland
    plant species
    Astragalus contortuplicatus
    Fabaceae
    germination
    experiment
    mallard
    seed dispersal
    seed ecology
    seed viability
    Opis:
    It was proposed previously that passive dispersal by migratory aquatic birds explain the widespread distribution of many wetland organisms. Several experimental studies have shown that many widespread wetland plant species can be readily dispersed within the guts of Anatidae. However, it is unclear whether plants with a more restricted distribution are able to disperse via waterbirds. This paper addresses the dispersal ability and germination ecology of the little-known Hungarian milkvetch Astragalus contortuplicatus, which occurs on banks of continental rivers and has a limited and unpredictable distribution. To test whether limited capacity for endozoochory by waterfowl could explain the sporadic appearance of this species, we force-fed ten captive mallards (Anas platyrhynchos) with 100 milkvetch seeds each. Droppings were collected for up to 45 h after feeding. Intact and viable seeds were found in the droppings of each mallard, and altogether 24.7% of seeds fed were recovered intact. The proportion of retrieved seeds that germinated (27.0%) was significantly higher than that of untreated control seeds (0.5%), but significantly lower than that of mechanically scarified seeds (96.0%). Retrieved seeds that germinated developed into healthy mature plants. Given the average flight velocity of mallards, seeds of A. contortuplicatus may travel up to 1600 km inside the digestive tract of migrating individuals. Our results suggest that avian vectors may be more important for the dispersal of rare higher plants (especially those with a hard seed-coat) than hitherto considered. Moreover, they suggest that rarity does not necessarily indicate limited dispersal ability, and may instead be explained by specific habitat requirements.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2015, 84, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of vascular plant species in woodland patches of Ojcow National Park (southern Poland) in relation to seed dispersal
    Autorzy:
    Moszkowicz, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/58019.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    plant distribution
    vascular plant
    plant species
    woodland
    Ojcow National Park
    Polska
    seed dispersal
    species richness
    ancient woodland
    multiple regression
    Opis:
    Plant diaspore dispersal is a fundamental process affecting the development of forest vegetation and its natural regeneration, especially with regard to typical woodland species, which spread slowly and form short-term soil seed banks. Most of these species have poor seed dispersal mechanisms, which is the major cause of their very slow expansion. The following questions were asked: (i) is there a relationship between the age of a woodland and the presence of forest vascular plant species representing different seed dispersal types; (ii) how do the proportions change between species representing different seed dispersal types in relation to the age of woodland; (iii) what factors determine the presence of species representing a given seed dispersal type; (iv) which factors affect the presence and which ones influence the abundance of selected woodland species? A multiple regression models were developed based on data obtained from 144 woodland patches designated for the study. A probit regression analysis was performed for selected species exhibiting various seed dispersal models. Woodland plants of all seed dispersal types show a significant relationship with the age of woodland, starting from the strongest linkage: anemochores, myrmecochores, endozoochores, epizoochores, barochores, autochores. As the woodland ages, the proportion of forest myrmecochores and anemochores grows, whilst the proportion of autochores, epizoochores and endozoochores shrinks. Results obtained indicate that the direct proximity of ancient woodland has a major effect on the occurrence of more poorly dispersing plants in recent woodlands, such as myrmecochores and heavy anemochores.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność przestrzenna i czasowa opadu bukwi na podstawie obserwacji w Babiogórskim i Ojcowskim Parku Narodowym
    Spatial and temporal variation in seed fall of beech in the Babia Góra and Ojców National Parks
    Autorzy:
    Skrzydłowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026403.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    zmiennosc czasowa
    buk zwyczajny
    zmiennosc przestrzenna
    produkcja nasienna
    Babiogorski Park Narodowy
    lesnictwo
    Fagus sylvatica
    Ojcowski Park Narodowy
    drzewa lesne
    fagus sylvatica
    seed production
    seed dispersal
    seed viability
    Opis:
    Spatial and temporal pattern of seed fall of beech was examined in the subalpine and upland natural forests with prevailing beech. The obtained results point to several regularities associated with seed density, fraction of full seeds in the seedlot, date of seeding and constant of the spatial pattern of beech seed fall.
    Źródło:
    Sylwan; 2003, 147, 06; 79-86
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola sójki (Garrulus glandarius) w inicjowaniu przemian sukcesyjnych zbiorowisk leśnych z udziałem dębu (Quercus sp.)
    Role of jay (Garrulus glandarius) in initializing successional changes in forest communities with the participation of oak (Quercus sp.)
    Autorzy:
    Olszewski, A.
    Brzeziecki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/980357.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    zbiorowiska lesne
    sukcesja roslin
    dab
    Quercus
    zoochoria
    sojka
    Garrulus glandarius
    acorn
    jay
    oak
    ornitochory
    seed dispersal
    stand heterogeneity
    tree succession
    zoochory
    Opis:
    The ability of spatial expansion and conquering of new locations, suitable for growth, is one of the most important properties enabling different plant species (including forest trees) a permanent existence in a constantly changing (in space and in time) environment. In the course of evolution, plants developed several adaptations and mechanisms enabling them to capture new localities appropriate for life. The key role in this process is played by so called propagules, i.e. differently built spores, seeds and fruits. The main sources of forces and major transportation vectors for propagules are such mechanisms as: power of gravity (barochory), wind (anemochory), water (hydrochory), animals (zoochory) and man (antropochory). Among them, in case of tree species producing large seeds, containing bulky amounts of food resources, the most important role is played by zoochory. The special variant of zoochory is ornitochory, i.e. dispersion of plant propagules by birds. One of the best known and documented examples of ornitochory is dispersal of oak acorns by jays (Garrulus glandarius). The contemporary research shows that during a vegetation period one single bird is able to deposit even several thousends of acorns within the area of 10 to 100 ha. The dispersal distance in case of acorns distributed by jays is variable and depends on several factors, first of all, climatic conditions and degree of environmental heterogeneity. On average, acorns are distributed within a distance of several hundred meters from seed trees; sometimes they are disseminated at a distance of several (4−8, maximum 20) kilometers. As a rule, only a part of deposited acorns is uncovered and consumed by birds, thus at least some of them can germinate and produce new oak seedlings. It was also recently demonstrated that jays preferably put down acorns under the stand canopies composed by tree species other than oak, for instance, under Scots pine trees. Under favourable conditions, this initiates natural successional processes and leads to a significant conversion of tree stand composition. Considering a large scale and commonness of this phenomenon, it deserves an interest and attention, not in the case of natural forests only, but in the case of managed forests as well, in which the quasi−natural, successional processes, initiated by jays, can considerably contribute to a greater compositional and structural diversity of tree stands.
    Źródło:
    Sylwan; 2019, 163, 06; 479-88
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rola ptaków w odnawianiu drzew ciężkonasiennych ze szczególnym uwzględnieniem buka Fagus sylvatica L.
    The role of birds in natural regeneration of large−seed trees with special reference to beech Fagus sylvatica L.
    Autorzy:
    Dula, P.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026747.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    ptaki
    zoochoria
    sojka
    botanika lesna
    lesnictwo
    Sitta europaea
    Garrulus glandarius
    buk zwyczajny
    nasiona
    orzechowka
    Nucifraga caryocatactes
    kowalik
    Fagus sylvatica
    ekologia
    drzewa lesne
    seed predation
    seed dispersal
    birds
    natural regeneration
    large−seeded trees
    beech
    coevolution
    jay
    nutoracker
    nuthatch
    Opis:
    The paper is a brief description of the role of birds in forest tree seed dispersal by synzoochory and seed consumption, as well as ecological consequences of these phenomena. Special attention has been drawn to the way seeds are stored by birds or in other words if the seeds can survive and be able to germinate. An overview of the most recent world literature connected with this subject was presented. An attempt has been made to assess the role of seed – eating birds in the natural forest ecosystem.
    Źródło:
    Sylwan; 2003, 147, 05; 65-75
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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