Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Morphological variability of leaves of Sorbus domestica L. in Croatia

100%

Poljak I., Kajba D., Ljubic I., Idzojtic M.

Acta Societatis Botanicorum Poloniae

|

2015

|

tom 84

|

nr 2

The paper studies the morphological variability of the service tree populations in the continental and Mediterranean regions of Croatia. The inter- and intra-population variability, as well as eco-geographic population differentiation, was established on the basis of eight measured morphological characteristics of two types of leaflets (lateral and terminal) and two derived ratios, using descriptive and multivariate statistical methods. The conducted research established a high variability of morphological characteristics. In comparison with lateral leaflets, terminal leaflets showed a higher degree of variability for the majority of the studied variables. The differences between the trees within populations, as well as the differences between populations, were confirmed for all studied characteristics. The study also confirmed a trend of population variations according to the eco-geographic principle. Populations from climatically different and geographically distant habitats, in other words from the Mediterranean and the continental region, differed in the majority of studied characteristics. In addition to the established pattern of ecotypical variability between the continental and the Mediterranean regions, the clinal variability with regard to altitude and mean annual temperature was also confirmed. Small, although statistically significant clinal variability with regard to the longitude was recorded for two measured characteristics. The conducted study provided insights into the variability of the service tree populations in Croatia, which is a basis for further research that should be implemented in order to produce guidelines for the breeding and conservation of genetic resources of this rare and endangered noble hardwood species.

2

Population variability of Beckmannia eruciformis [Poaceae] in Central Eastern Poland

100%

Ciosek M. T., Krechowski J., Piorek K., Borkowska L., Blazik A.

Electronic Journal of Polish Agricultural Universities. Series Biology

|

2008

|

tom 11

|

nr 2

3

Salivary aldehyde dehydrogenase - temporal and population variability, correlations with drinking and smoking habits and activity towards aldehydes contained in food

80%

Giebultowicz J., Dziadek M., Wroczynski P., Woznicka K., Wojno B., Pietrzak M., Wierzchowski J.

Acta Biochimica Polonica

|

2010

|

tom 57

|

nr 3

Fluorimetric method based on oxidation of the fluorogenic 6-methoxy-2-naphthaldehyde was applied to evaluate temporal and population variability of the specific activity of salivary aldehyde dehydrogenase (ALDH) and the degree of its inactivation in healthy human population. Analyzed was also its dependence on drinking and smoking habits, coffee consumption, and its sensitivity to N-acetylcysteine. Both the specific activity of salivary ALDH and the degree of its inactivation were highly variable during the day, with the highest activities recorded in the morning hours. The activities were also highly variable both intra- and interpersonally, and negatively correlated with age, and this correlation was stronger for the subgroup of volunteers declaring abstinence from alcohol and tobacco. Moderately positive correlations of salivary ALDH specific activity with alcohol consumption and tobacco smoking were also recorded (rs ~0.27; p = 0.004 and rs = 0.30; p = 0.001, respectively). Moderate coffee consumption correlated positively with the inactivation of salivary ALDH, particularly in the subgroup of non-drinking and non-smoking volunteers. It was found that mechanical stimulation of the saliva flow increases the specific activity of salivary ALDH. The specific activity of the salivary ALDH was strongly and positively correlated with that of superoxide dismutase, and somewhat less with salivary peroxidase. The antioxidant-containing drug N-acetylcysteine increased activity of salivary ALDH presumably by preventing its inactivation in the oral cavity. Some food-related aldehydes, mainly cinnamic aldehyde and anisaldehyde, were excellent substrates of the salivary ALDH3A1 enzyme, while alkenals, particularly those with short chain, were characterized by lower affinity towards this enzyme but high catalytic constants. The protective role of salivary ALDH against aldehydes in food and those found in the cigarette smoke is discussed, as well as its participation in diminishing the effects of alcohol- and smoking-related oxidative stress.

4

Variation in acorn traits among natural populations of Quercus alnifolia, an endangered species in Cyprus

80%

Anagiotos G., Tsakaldimi M., Ganatsas P.

Dendrobiology

|

2012

|

tom 68

Quercus alnifolia is an endemic species in Cyprus, and it is rated as Vulnerable (VU) in the Red List of Oaks. Although Q. alnifolia has a great ecological importance, there are only few studies about this species. In this work we have studied the natural variability of this species by analyzing acorn dimensions, acorn mass, length of embryo, moisture content of acorns and seed germinability among the seven acorn provenances, collected in Cyprus. We also determined the seeds responses to drying. Germination trials were also carried out, and differences in seed germination among populations were examined. Rate of water loss and its effect on seed germination was also estimated by application of specific desiccation treatments. The results showed that acorn characteristics significantly differed between the populations, following a general trend to reduce their dimensions and mass with the altitude increase. Seed germination was high for all studied populations, and germination behaviour was similar for all populations. Desiccation of acorns below 35% resulted in a great reduction of seed germination capacity.

5

Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland

80%

Dzik J.

Acta Palaeontologica Polonica

|

2002

|

tom 47

|

nr 4

The dominant factor in faunal succession of conodonts in the Frasnian of Poland is the apparent immigration of species originating allopatrically in other regions. Each immigration event usually changes the population variability of a local species (character displacement). Only a few lineages show their phyletic evolution within the studied area. Attempts to distinguish conodont species on the basis of platform element shape failed in some of the latest Frasnian palmatolepidids. Even at the apparatus−based generic level, certain ramiform elements of the apparatus appear much more diagnostic than the platforms. Correlative value of the late Frasnian palmatolepidids of unknown apparatus structure is thus questionable. The evolution of platform elements in Ancyrodella offers a more solid basis for age determination although their great population variability makes resolution rather low and requires the population approach. The panderodontids Belodella(?) tenuiserrata sp., B. minutidentata sp. nov., B. robustidentata sp. nov., prioniodontid Icriodus kielcensis sp. nov., enigmatic monospecific Playfordiidae fam. nov., prioniodinids Dyminodina planidentata gen. et sp. nov., D. anterodenticulata sp. nov., D. kovalensis sp. nov., Pluckidina kielcensis gen. et sp. nov., P. slupiensis sp. nov., P. robustipegmata sp. nov., and P. lagoviensis sp. nov., derived polygnathid Avignathus bifurcatus sp. nov., probably secondarily simplified polygnathid Nicollidina gen. nov., and palmatolepidids Kielcelepis gen. nov., Lagovilepis gen. nov. and Klapperilepis gen. nov. are proposed.

6

Genetyczna zmienność potomstwa czterech proweniencji jodły pospolitej (Abies alba MILL.) wyrażona w polimorfizmie mikrosatelitarnego jądrowego DNA (nSSRs)

70%

Pawlaczyk E. M., Chudzinska E., Bobowicz M. A.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

2010

|

tom 555

Przedmiotem badań było potomstwo czterech proweniencji jodły pospolitej (Abies alba MILL.) z północno-wschodniej granicy zasięgu, rosnące na powierzchni doświadczalnej w Nadleśnictwie Nawojowa. Celem badań było poznanie międzyproweniencyjnej zmienności genetycznej jodły pospolitej. Do badań wytypowano potomstwo 111 drzew matczynych (rodów) jodły z: Nadleśnictwa Białowieża, Rezerwatu Jata, Rezerwatu Kamienna Góra oraz Rezerwatu Łabowiec. Przeanalizowano zmienność 2 loci mikrosatelitarnego jądrowego DNA. Obliczono: liczbę alleli w locus (Na), liczbę efektywnych alleli (Ne), obserwowaną i oczekiwaną heterozygotyczność (Ho, He), indeks wsobności Wrightʼa (F), parametry równowagi genotypowej (FIS, FIT), współczynnik zróżnicowania międzypopulacyjnego FST, przepływ genów (Nm), oraz odległości genetyczne. Dodatkowo wykonano molekularną analizę wariancji (AMOVA), która wykazała, że populacje różnią się między sobą istotnie statystycznie. Wykryto, że 5% ogólnego wykrytego zróżnicowania występuje pomiędzy populacjami, a 95% wewnątrz populacji. Badania wykazały, że poziom zmienności genetycznej jodły jest niski w porównaniu z innymi drzewami iglastymi, pomimo że wszystkie analizowane loci były polimorficzne. Żadna populacja nie posiadała alleli unikatowych. Przepływ genów (Nm) pomiędzy populacjami był duży, a współczynnik zróżnicowania międzypopulacyjnego był niski. Najwyższą heterozygotyczność obserwowaną wykazywały populacje z Łabowca i z Kamiennej Góry, a najmniejszą populacja z Białowieży. Najwyższą heterozygotyczność oczekiwaną wykazywała populacja z Białowieży, a najmniejszą populacja z Kamiennej Góry. Wszystkie badane populacje wykazały niedobór heterozygot, a największy niedobór heterozygot zaobserwowano w potomstwie populacji z Białowieży, a najmniejszy z Kamiennej Góry. Największą odległość genetyczną zaobserwowano pomiędzy potomstwem populacji z Jaty i Białowieży, a najmniejszą pomiędzy potomstwem populacji z Łabowca i z Kamiennej Góry. Niniejsze badania wykazały, że Białowieska proweniencja różni się zdecydowanie od trzech pozostałych. Proweniencja ta, jest populacją sztuczną, założoną na początku XX wieku i powstałą z nasion niewiadomego pochodzenia. Odrębność proweniencji z Białowieży może wynikać z jej lokalizacji. Rośnie ona ok. 100 km poza granicą naturalnego zasięgu gatunku, co może ograniczać przepływ genów z innymi proweniencjami.

Ograniczanie wyników

Morphological variability of leaves of Sorbus domestica L. in Croatia

Population variability of Beckmannia eruciformis [Poaceae] in Central Eastern Poland

Salivary aldehyde dehydrogenase - temporal and population variability, correlations with drinking and smoking habits and activity towards aldehydes contained in food

Variation in acorn traits among natural populations of Quercus alnifolia, an endangered species in Cyprus

Emergence and collapse of the Frasnian conodont and ammonoid communities in the Holy Cross Mountains, Poland

Genetyczna zmienność potomstwa czterech proweniencji jodły pospolitej (Abies alba MILL.) wyrażona w polimorfizmie mikrosatelitarnego jądrowego DNA (nSSRs)