Wyniki wyszukiwania

1

Seed mass variation in Central European populations of invasive Impatiens glandulifera Royle

100%

Chmura D., Csontos P., Sendek A.

Polish Journal of Ecology

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2013

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tom 61

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nr 4

Positive correlation between seed weight and germination capacity is common for the vast majority of species. It is also known that seed weight can vary along a latitudinal gradient. The seed mass of the invasive Himalayan balsam (Impatiens glandulifera), which is native to East Asia, was examined in relation to distinct geographical regions in Poland (Bielsko-Biala: N49°52′32″, E18°57′43″; Katowice: N50°12′8.3″, E18°57′26″; Tworków: N50°01′22″, E18°15′28”); Hungary (Rum: N47°06′41″, E16°50′45″; Rábahídvég: N47°03′54″, E16°44′59″) and Germany (Halle: N51°28′47″, E11°57′12″; Marburg: N50°48′32″, E8°46′31″). The study revealed that seed mass varied both among the countries and among specific populations within Poland and Germany. In Hungary, the 50 seed lots were the lightest 0.29 g and 0.31 g in respective localities and the heaviest in single populations in Poland – 0.61 g and in Germany – 0.57 g. In the present study, populations located more southwards had the lightest seeds in contrast to the commonly encountered pattern. Higher temperature, lower precipitation and as a consequence, a shortage of water can be crucial factors that affect the seed mass of I. glandulifera. Taking into account the lower frequency and abundance of the species in Hungary, the lower seed mass may probably contribute to the limited distribution range in this region.

2

Mass and density as separation criteria of pedunculate oak (Quercus robur L.) seeds

100%

Tylek P., Kaliniewicz Z., Kielbasa P., Zagrobelny T.

Electronic Journal of Polish Agricultural Universities. Series: Forestry

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2015

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tom 18

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nr 4

3

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Aerodynamic and geometric properties of amaranth seeds

100%

Kram B., Szot B.

International Agrophysics

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1999

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tom 13

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nr 2

4

Studies on some seed traits of Primula veris L. plants from cultivated populations

100%

Morozowska A.

Herba Polonica

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2004

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tom 50

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nr 3-4

The number and the weight of seeds per capsule were assessed along with the individual seed mass in cowslip plants of various origin, grown in plots with differing plant spacing. The potential seed productivity (the number of ovules per ovary) and the real seed yield (the number of seeds per capsule) were determined for the cultivated plants and the effect of seed origin and gibberellic acid (GAj) on germination capacity was evaluated under field conditions. The mean seed number per capsule for plants growing at the 40 x 30 spacing ranged from 31.2 to 64.4, whereas for the 30x15 spacing it ranged from 37.2 to 60.6 seeds per capsule, depending on the year of study and the flower morph type. The seed number per capsule and the individual seed mass turned out to be traits dependent in a statistically significant way on the origin of seeds used to start the cultivated populations. Plants from populations 2 and 3 produced the heaviest seeds (mean = 1.10 mg and 1.14 mg). The differentiation in the number of seeds per capsule and in the individual seed mass in fruits coming from the same scape was statistically significant. The mean number of ovules per ovary ranged from 64.8 to 71.0 and the mean seed number per capsule ranged from 46.2 to 51.7. The number and percentage of germinated .seeds ranged from 6 (4.0%) to 48 (32.0%), depending on the seed origin. Seeds treated with GA3 germinated in 36.0 to 813%.

5

Effectiveness of the pneumatic separation of Norway spruce Picea abies (L.) Karst seeds

84%

Tylek P., Walczyk J.

Dendrobiology

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2004

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tom 51 Supplement

The paper presents the theoretical basis for the pneumatic separation of Norway spruce seeds along with the results of investigations into the effectiveness of separation conducted in a pneumatic separator with a vertical air column. Such a separator was designed and produced at the Department of Forest Works Mechanization of the Agricultural University of Kraków. The device makes it possible to separate a mixture into three fractions based on the differences in critical velocities. The variation in density among different seed fractions is about two times lower than the variation in seed mass. This result supports the suggestion that omitting the size calibration of seeds before their pneumatic separation could lead to the dominance of seed density as a distinguishing feature.

6

Mozliwosc przewidywania plonu bulw okreslonej frakcji na podstawie zroznicowanej masy sadzeniaka

84%

Zarzynska K.

Biuletyn Instytutu Ziemniaka

|

1996

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nr 46

39-50

7

The influence of vegetation structure on the composition of the seed rain and seedling pool in abandoned Molinion caeruleae meadows

84%

Kostrakiewicz-Gieralt K.

Polish Journal of Ecology

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2017

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tom 65

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nr 2

The investigations of the effect of different habitat conditions on the composition of the seed rain and seedling pool were conducted in the years 2014 and 2015 in abandoned patches of Molinion caeruleaedominated by small-stature meadow taxa (patch I), tall-growing grasses (patch II), as well as shrubs and trees (patch III). Observations showed that along the successional gradient the seed rain and seedling pool diminishes. The prevalence of perennials and native taxa in the seed rain and seedling pool occurred in all the study sites. Moreover, in the propagule and seedling pools of all the patches hemicryptophytes and meadow taxa prevailed but their number decreased in successional sites. Also, the abundance of ruderal and grassland taxa decreased gradually, at expense of number of forest species. Zoochorous species prevailed in the seed rain and seedling pool of all patches. Number of hydrohorous species decreased in successional patches, while the abundance of species with other dispersal modes were similar. Irrespective of patch character, the species producing propagules with medium size dominated in the seed rain and seedling pools, whereas a significant decrease of number of small-seeded species was noticed only in the seedling pool. Despite the diminishing of the seed rain and seedling pool along the successional gradient, the gap creation might be a very effective way of active protection of Molinion caeruleae meadows. However, the gap colonisation requires permanent monitoring to avoid further spreading of undesired taxa.

8

Generative reproduction in Rumex confertus Willd. populations

84%

Stosik T.

Electronic Journal of Polish Agricultural Universities. Series Biology

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2007

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tom 10

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nr 4

9

The physical attributes of safflower seed as a function of moisture content, variety and size

84%

Shakeri M., Khodabakhshian R.

Electronic Journal of Polish Agricultural Universities. Series Food Science and Technology

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2011

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tom 14

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nr 3

10

Rye-grass seeds aerodynamic properties vs seed weight and dimensions

84%

Szpryngiel M., Kram B.

International Agrophysics

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1994

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tom 08

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nr 2

11

Seed mass increase along altitude within four Saussurea (Asteraceae) species in Tibetan Plateau

67%

Wu G.-L., Tian F.-P., Ren G.-H., Liu Z.-H.

Polish Journal of Ecology

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2011

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tom 59

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nr 3

Seed mass is a critical lifehistory character in seed evolutionary ecology. Plant species can present responses in seed mass to environment stresses. We tested the hypotheses that seed mass was positively correlated with altitude within species. We selected four congeneric Saussurea species as study objects, and collected their seeds along altitudinal gradients (2100–4200 m a.s.l.) in the alpine area of the Qinghai-Tibetan Plateau, China. Results showed that mean seed mass of the four species were significantly affected by altitude (P <0.001). There was a general trend of an increase in seed weight with altitude among the populations of the four species. In addition, mean seed mass of four species were not significantly different, but all presented a bigger coefficients of variation within species along altitude gradients. Our results indicate selection pressure within species, with larger seeds occurring at higher altitudes.

12

Wplyw doboru testerow na ocene efektow GCA linii wsobnych rzepaku jarego

67%

Bocianowski J., Brzeskwiniewicz H., Luczkiewicz T.

Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin

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2008

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nr 250

279-285

13

The effect of gaps size on colonization process in Molinietum caeruleae meadows with different habitat conditions

67%

Kostrakiewicz K.

Polish Journal of Ecology

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2011

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tom 59

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nr 4

The disturbances defined as an external factor causing biomass removal are a key component of all ecosystems. In phytocenoses with a continuous vegetation cover and a large proportion of perennial plants the fine-scale disturbances create gaps, which are the temporary competitor-free microsites suitable for plant recruitment. The investigations of natural colonization of different size gaps in Molinietum caeruleae meadows were carried out in patches dominated by small species creating delicate, erect or procumbent stems (MC), prevailed by large-tussock grasses (GR), and overgrown by willows (SA). Each patch was represented by ten plots, divided into four square subplots of 0.16 m2, 0.09 m2, 0.04 m2 and 0.01 m2. In each of them the aboveground parts of plants were clipped and removed with the litter. The seedlings recruitment was observed in 2007–2009. The highest species richness in gaps was observed in the MC patch and might be caused by week competition for light from neighbouring plants with delicate, procumbent stems and narrow leaves. The smaller rate of recruitment in SA and GR patches could be caused by overshading willows as well as by the competition from large and dense tussocks of Deschampsia caespitosa and Molinia caerulea. At all patches species richness declined with the decreasing gap size. The developed seedling pool represented both species occurring in the surrounding canopy and such which were not found there. However, their contribution varied between particular patches. Regardless gap size, the MC seedling pool was dominated by species which did not occur in the established vegetation, whereas in GR gaps both groups were represented by similar numbers of taxa and the SA gaps become dominated by species present in the surrounding canopy. Irrespective of patch character, in each subplot the medium-seeded species were represented most abundantly. The recruitment of genets of large-seeded species decreased, while the abundance of individuals of small-seeded taxa increased with the increasing gap size. In the light of the performed study, one might suggest that extent-controlled disturbances can be used as an effective way of the conservation of Molinietum caeruleae patches dominated by small meadow species being outcompeted by large-tussock grasses and over-shaded by willows.

14

Effects of seed mass and light on seedling success in Artemisia sieviersiana Willd in the Tibetan Plateau

67%

Wu G.-L., Li W., Du G.-Z.

Polish Journal of Ecology

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2010

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tom 58

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nr 3

Seed mass and light availability are important factors which affect seedling recruitment in plant populations. Effects of seed mass and light availability on seed germination and seedling recruitment in Artemisia sieversiana Willd, which is a widely distributed herbs and a common component species in alpine meadows of the Tibetan Plateau, were tested in a manipulative field experiment. Our research indicated that seed mass and light significantly affected seed germination and seedling emergence and survival and there was a significant interaction effect between seed mass and light availability on these life traits within species. Our study showed that larger seeds presented significant advantages in germination, seedling emergence and survival than smaller seeds under different light availability, especially under deep shade. Our results suggested that seedling success of Artemisia sieversiana appears to be regulated by an interactive effect of seed mass and light availability in alpine meadow of the Qinghai-Tibetan Plateau. In addition, seedlings from larger seeds have more and more stronger advantages from germination, emergence to survival stage than seedlings from smaller seed within species.

15

Wintering farmland bird assemblages in West Hungary

67%

Baldi A., Somay L., Kovacs-Hostyanszki A.

Polish Journal of Ecology

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2015

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tom 63

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nr 4

Farmland bird populations declining rapidly all over Europe. Most of the knowledge is, however, from the breeding season, and much less is known about the winter period, especially from Central and Eastern Europe. We censused wintering farmland bird assemblages in West Hungary, in 2011/2012. The censuses covered semi-natural and seeded grasslands, plough fields and wheat fields. The available winter seed food was estimated for each field from the top soil and from the vegetation. We recorded 25 species with 844 individuals on the fields. Semi-natural grasslands were the most important habitats for species richness of all, granivorous, and resident species, with seeded grasslands as the second best habitat. Abundance showed similar pattern, although with no significant effect for granivorous species and for short-range migrants. Seed mass was significantly different among the habitat types, higher on seeded grasslands and seminatural grasslands than on ploughed sites and winter wheat fields. Date had a significant effect on species richness and abundance with highest values in December. There was a positive significant correlation between bird species richness and seed mass only in December. Our results strengthen former findings that changes and drivers of wintering farmland bird populations may differ between Central and West Europe, and highlight the need for further, large scale studies to provide evidence base to guide agrienvironmental programs.

16

Właściwości fizyczne masy nasion soczewicy

67%

Szot B., Stepniewski A.

Acta Agrophysica

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2001

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tom 58

17

Współzależności między cechami fizycznymi nasion jodły pospolitej

67%

Kaliniewicz Z., Mankowski S., Tylek P., Krzysiak Z., Peda W.

Acta Agrophysica

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2018

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tom 25

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nr 2

Z doniesień literaturowych wynika, że na tempo i efektywność kiełkowania nasion w dużym stopniu wpływa ich masa. Jednak ze względu na trudność przeprowadzenia na dużą skalę kalibracji nasion pod względem ich masy poszukuje się cech silnie z nią powiązanych, które w zastępstwie można wykorzystać przy separacji materiału nasiennego. W związku z tym celem pracy jest wyznaczenie zakresu zmienności podstawowych cech fizycznych nasion jodły pospolitej oraz określenie współzależności między tymi cechami w aspekcie wykorzystania uzyskanych informacji przy planowaniu i realizacji procesów sortowania nasion tego gatunku. Badaniami objęto 5 partii nasion, które pozyskano z polskich drzewostanów w regionie nasiennym Jd62. Dokonano pomiarów prędkości krytycznej unoszenia, grubości, szerokości, długości, kąta tarcia zewnętrznego i masy każdego nasiona. Na podstawie tych cech obliczono geometryczną średnicę zastępczą, wskaźnik proporcji wymiarów, wskaźnik sferyczności oraz gęstość nasion. Stwierdzono, że cechami rozdzielczymi, które można wykorzystać przy kalibracji nasion jodły pospolitej pod względem ich masy w kolejności malejącego związku korelacyjnego są: grubość, długość, prędkość krytyczna unoszenia, szerokość, gęstość oraz kąt tarcia zewnętrznego. W procesie uszlachetniania analizowanego materiału nasiennego powinno się stosować przede wszystkim separatory sitowe z sitami o otworach podłużnych, wyposażone w przynajmniej dwa sita: o wymiarze roboczym ≠3,5 mm i ≠2,25 mm. Dzięki takiemu zestawowi sit z materiału nasiennego będzie można wyodrębnić nasiona bezwartościowe oraz wydzielić frakcję nasion najbardziej dorodnych, którą ze względu na potencjalnie najwyższą zdolność kiełkowania można przeznaczyć do prowadzenia siewu punktowego lub obsiewania pojedynczych kaset i bloków styropianowych przy produkcji tzw. sadzonek z bryłką.

18

Analiza cech empirycznych i pośrednich strąków tradycyjnej odmiany bobiku (Vicia faba L.). Część I. Porównanie cech strąków rozmieszczonych na trzech odcinkach owocującej części pędu

59%

Zajac T., Kulig B., Strojny J.

Acta Agraria et Silvestria. Series Agraria

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2006

|

tom 48

In the period of 2001-2002 empirical (7) and indirect (2) traits of poods of traditional cultivar 'Nadwiślański' field bean were analyzed depending on their location on the shoot fruiting part. There were distinguished three segments on the shoot fruiting part: bottom, middle and top. Plants were grown from sowing of 50 seeds per 1 m2. Quantity and mass of individual seed placed on specified points within pods were determined. According to the study, the longest pods (6.02 ±0.62 cm) were formed within bottom segment of the shoot, a bit shorter ones (5.90 ±0.45 cm) were formed within the middle plant's fruiting part. The largest seed mass (2.03 ±0.393 g) tended to occur in pods grouped within the middle segment of shoot fruiting part. Seeds mass shares in the total pods' mass were similar in the case of pods from bottom, middle and top segment and amounted to: 79.9% ±3.39, 79.7% ±3.82, 77.7% ±6.18 respectively. Specific seeds mass was determined by their location within a pod. The largest mass was possessed by seeds situated within middle pod's part. The smallest seeds were formed within the top segment of shoot fruiting part.

19

Wpływ zagęszczenia łanu rzepaku jarego na masę nasion z rośliny i elementy struktury plonu

59%

Cieslinski M., Ostrowska D., Gozdowski D.

Acta Scientiarum Polonorum. Agricultura

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2008

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tom 07

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nr 3

W latach 2002-2003 na Kolekcji Roślin Rolniczych (52°9’ N; 21°2’ E) Katedry Agronomii Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie przeprowadzono ścisłe, jednoczynnikowe doświadczenia polowe z rzepakiem jarym odmiany Licosmos. Celem badań była analiza plonowania roślin rzepaku zależnie od zróżnicowanego zagęszczenia łanu, tj. 40, 60 i 80 roślin·m⁻². Pomiary obejmowały ocenę masy nasion z rośliny oraz elementów jego struktury, tj. liczby łuszczyn na roślinie, liczby nasion w łuszczynie oraz masy 1000 nasion. Pomiary wykonano na 10 kolejnych roślinach z losowo wybranego rzędu w czterech powtórzeniach, z uwzględnieniem oddzielnie pędu głównego oraz rozgałęzień I i II rzędu. Zagęszczenie łanu w zakresie od 40 do 80 roślin·m⁻² wyraźnie różnicowało masę nasion z rośliny, co wskazuje na duże zdolności przystosowawcze roślin rzepaku jarego do zróżnicowanej obsady. Większa masa nasion z roślin rosnących w mniejszym zagęszczeniu była przede wszystkim wynikiem wzrostu liczby łuszczyn na roślinie. Pozostałe elementy struktury plonu, tj. liczba nasion w łuszczynie i masa 1000 nasion, okazały się bardziej stabilne i w niewielkim stopniu zależne od zagęszczenia roślin na jednostce powierzchni.

20

Analiza cech fizycznych nasion wybranych gatunków jałowców

59%

Kaliniewicz Z., Anders A., Markowski P., Jadwisienczak K., Krzysiak Z.

Acta Agrophysica

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2017

|

tom 24

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nr 3

W dostępnej literaturze brakuje informacji o zakresie zmian cech fizycznych nasion większości krzewów leśnych i występujących między tymi cechami współzależności. Dane te są potrzebne przy projektowaniu i modelowaniu wielu procesów związanych z obróbką materiału nasiennego. Z tego względu dokonano pomiarów prędkości krytycznej unoszenia, grubości, szerokości, długości, masy i kątów tarcia zewnętrznego nasion wybranej grupy krzewów, a mianowicie czterech gatunków jałowców (chińskiego, pospolitego, skalnego i wirginijskiego). Na podstawie tych pomiarów obliczono wskaźniki charakteryzujące relacje między wymiarami i masą nasion. Wyniki pomiarów i obliczeń opracowano statystycznie, wykorzystując analizę wariancji, analizę korelacji oraz analizę regresji liniowej. Średnie wartości wyznaczonych cech nasion zawierają się w przedziałach: prędkość krytyczna unoszenia – od 6,99 do 9,51 m·s–1, grubość – od 1,72 do 2,56 mm, szerokość – od 2,23 do 3,28 mm, długość – od 3,40 do 4,60 mm, kąt tarcia zewnętrznego – od 26,61 do 34,18° i masa – od 6,93 do 19,56 mg. Cechą najbardziej skorelowaną z pozostałymi jest masa nasion, a najmniej – kąty tarcia zewnętrznego i gęstość. Największe wartości współczynnika korelacji oraz równania z najwyższą wartością współczynnika determinacji uzyskano dla zależności masy i prędkości krytycznej unoszenia (nasiona jałowców chińskiego i wirginijskiego) oraz masy i grubości (nasiona jałowców pospolitego i skalnego). W procesie uszlachetniania materiału nasiennego jałowców jest wskazane stosowanie separatorów sitowych z sitami o otworach okrągłych, przy czym zadowalające efekty można uzyskać przy wykorzystaniu sit z otworami o średnicy: 1,5 i 1,75 mm (jałowiec wirginijski), 1,75 i 2,0 mm (jałowiec pospolity), 2,0 i 2,5 mm (jałowiec chiński) oraz 2,25 i 2,75 mm (jałowiec skalny).

Ograniczanie wyników

Seed mass variation in Central European populations of invasive Impatiens glandulifera Royle

Mass and density as separation criteria of pedunculate oak (Quercus robur L.) seeds

Aerodynamic and geometric properties of amaranth seeds

Studies on some seed traits of Primula veris L. plants from cultivated populations

Effectiveness of the pneumatic separation of Norway spruce Picea abies (L.) Karst seeds

Mozliwosc przewidywania plonu bulw okreslonej frakcji na podstawie zroznicowanej masy sadzeniaka

The influence of vegetation structure on the composition of the seed rain and seedling pool in abandoned Molinion caeruleae meadows

Generative reproduction in Rumex confertus Willd. populations

The physical attributes of safflower seed as a function of moisture content, variety and size

Rye-grass seeds aerodynamic properties vs seed weight and dimensions

Seed mass increase along altitude within four Saussurea (Asteraceae) species in Tibetan Plateau

Wplyw doboru testerow na ocene efektow GCA linii wsobnych rzepaku jarego

The effect of gaps size on colonization process in Molinietum caeruleae meadows with different habitat conditions

Effects of seed mass and light on seedling success in Artemisia sieviersiana Willd in the Tibetan Plateau

Wintering farmland bird assemblages in West Hungary

Właściwości fizyczne masy nasion soczewicy

Współzależności między cechami fizycznymi nasion jodły pospolitej

Analiza cech empirycznych i pośrednich strąków tradycyjnej odmiany bobiku (Vicia faba L.). Część I. Porównanie cech strąków rozmieszczonych na trzech odcinkach owocującej części pędu

Wpływ zagęszczenia łanu rzepaku jarego na masę nasion z rośliny i elementy struktury plonu

Analiza cech fizycznych nasion wybranych gatunków jałowców