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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Wykorzystanie linii podwojonych haploidów do badania zjawiska heterozji u jęczmienia

100%
Polok K.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1997
|
tom 451
Z heterozyjnych mieszańców jęczmienia za pomocą kultur pylnikowych wyprowadzono linie podwojonych haploidów, które porównano z mieszańcami pod względem cech agrobotanicznych. W trzech z czterech badanych kombinacji krzyżówkowych wyselekcjonowano z częstością 4,4-18% linie DH, które pod względem plonowania dorównywały mieszańcom heterozyjnym. Wykazano, że przyczyną wystąpienia efektu heterozji u badanych mieszańców było dominowanie oraz addytywne i nieaddytywne współdziałanie genów z różnych loci.
2

Evolutionary status of closely related Lolium taxa

100%
Polok K.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
3

Comparison of two Pellia endiviifolia sibling species on the base of RAPD and ISJ markers

100%
Polok K.
Biological Bulletin of Poznań
|
2001
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tom 38
|
nr 2
4
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Wykorzystanie markerów molekularnych w badaniach nad zróżnicowaniem genetycznym Lolium perenne, Lolium multiflorum

63%
Zielinski R., Polok K.
Zeszyty Problemowe Postępów Nauk Rolniczych
|
1997
|
tom 451
W pracy przedstawiono wyniki badań własnych oraz dane literaturowe dotyczące podobieństwa genetycznego Lolium perenne i L. multiflorum. Przedstawiono możliwości wykorzystania markerów molekularnych jako markerów gatunkowych oraz omówiono stan badań nad mapowaniem genomu Lolium.
5

Molekularne podstawy opornosci Mycobacterium tuberculosis na izoniazyd

63%
Rylski M., Polok K.
Postępy Mikrobiologii
|
2002
|
tom 41
|
nr 1
21-35
6

The evaluation of the genetic similarity of roses [Rosa L.] in Caninae section

63%
Nowak R., Polok K.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
7

Use of DNA markers for assessing the genetic identity between native and introduced stone pine [Pinus cembra] in the Tatra Mountains

63%
Chmiel J., Polok K.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
8

Molecular evolution and taxonomy of plants

63%
Zielinski R., Polok K.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
9
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Weryfikacja pochodzenia drzewiastych form kosodrzewiny na terenie Tatrzańskiego Parku Narodowego na podstawie polimorfizmu miejsc insercji transpozonów

51%
Polok K., Zwijacz-Kozica T., Zielinski R.
Sylwan
|
2016
|
tom 160
|
nr 07
Closely related Pinus species, mountain pine (Pinus mugo Turra) and Scots pine (Pinus sylvestris L.), belong to native woody species in the Tatra National Park (TPN, southern Poland). Their occurrence in close proximity can lead to the formation of natural hybrids known as Pinus × rhaetica, which is a woody, often polycormic form. Pinus×rhaetica is described in the TPN, but there has been a great deal of disagreement over its origin. The goal of the studies was to verify the taxonomic status of individuals identified as Pinus×rhaetica that grew in the eight stands together with P. mugo and P. sylvestris by SSAP (Sequence Specific Amplification Polymorphism) analysis of transposon insertional polymorphism. In total, 34 Pinus×rhaetica, 25 P. mugo and 27 P. sylvestris individuals were tested in addition to 20 individuals of P. uliginosa from ‘Torfowisko pod Węglińcem' and ‘Wielkie Torfowisko Batorowskie' as well as 25 individuals of P. uncinata from the Austrian Alps as the control groups. Four transposon sequences were employed: a DNA transposon from the CACTA family, Tpo and retrotransposons – two gypsy (Ogre, IFG7) and one copia like (Bare). All species belonging to the Pinus mugo complex are highly variable with 49−81% polymorphic loci and genetic diversity, HTequals 0.228−0.307 with the highest values in Pinus×rhaetica. Surprisingly, P. sylvestris proves to be the least variable species, likely because of a narrow gene pool in small, scattered stands in the Tatras. Very low Nei's genetic similarities between P. sylvestris and Pinus mugo complex, especially in comparison with P. uliginosa (I=0.548) and P. mugo (I=0.558) exclude unequivocally the possibility of spontaneous hybridization among these taxa. Thus, it undermines the hypothesis about hybrid origin of Pinus×rhaetica in the Tatras. It proves to be a morphological form of P. mugo as assessed from the Nei's coefficient, I=0.985 which is well within a range of conspecific populations. Finally, none of the studied individuals of Pinus×rhaetica are derived from seeds of Alpine P. uncinata.
10
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Isozyme variation in callus culture of Arabidopsis thaliana (L.) Heynh

51%
Gaj M., Kucharska M., Maluszynski M., Polok K.
Genetica Polonica
|
1991
|
tom 32
|
nr 4
11

Ochrona naturalnej puli genowej rodzimej limby Pinus cembra L. z Tatr w swietle badan molekularnych

51%
Chmiel J., Milewski T., Polok K.
Roczniki Bieszczadzkie
|
2008
|
tom 16
215-232
12

Application of DNA markers to estimate genetic diversity of Mycobacterium tuberculosis strains

51%
Korzekwa K., Polok K., Zielinski R.
Polish Journal of Microbiology
|
2006
|
tom 55
|
nr 1
The obligatory human pathogen, Mycobacterium tuberculosis, is the most important etiological factor of tuberculosis. Unfortunately, there is little information about genetic diversity of this pathogen. The main aim of this research was the estimation of genetic diversity of M. tuberculosis on the basis of various categories of DNA markers. The genome of 32 strains were scanned by DNA markers such RAPD, IS6110 and catalase-peroxidase katG gene. All 162 identified loci were polymorphic. The genetic diversity coefficient (HT) of M. tuberculosis was 0.32 for RAPD and 0.27 for IS6110. There were 14 alleles in katG gene. All strains were characterised by the individual molecular pattern. Genetic similarity varied from 0.13 to 0.94 (RAPD markers) and from 0 to 1 for (IS6110). M. tuberculosis strains did not represent a clonal structure, single source of transmission and epidemiological relationships as well. The applied DNA markers proved to be highly efficient for analysis of genetic structure of M. tuberculosis.
13
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Content available

Gene segregation in a barley DH population

51%
Szarejko I., Maluszynski M., Polok K., Zbieszczyk J.
Journal of Applied Genetics
|
1997
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tom 38
|
nr 4
A large population of anther culture-derived barley regenerants and their progeny was tested for allele segregation at 1 isozyme and 8 morphological marker loci. The segregation of genetic markers was examined separately for haploid, diploid and polyploid regenerants. All the 9 analysed genes except al (albino lemma) on chromosome 3 segregated according to the expected 1:1 ratio in the microspore-derived barley population. There was no difference in allele distribution between haploid and diploid regenerants. Among the limited number of 34 analysed tetraploids a significant excess of the dominant allele at locus о (orange lemma) of chromosome 6 was also observed. The recombination frequency between linked genes (n - lk2 on chromosome 1 and r - s on chromosome 7) estimated in the DH population did not differ significantly from recombination rates calculated in F₂ progeny or presented in barley chromosome maps. The phenomenon of gametic selection is discussed in relation to the genotype dependency of anther culture response and procedures used for DH production in barley.
14

Genetic structure of Dreissena polymorpha [Pallas] population in Lake Insko, North-Western Poland

51%
Soroka M., Zielinski R., Polok K., Swierczynski M.
Polskie Archiwum Hydrobiologii
|
1997
|
tom 44
|
nr 4
15

Genetic variability of Dreissena polymorpha [Pallas] populations from Western Pomerania, Poland

51%
Zielinski R., Soroka M., Polok K., Swierczynski M.
Polskie Archiwum Hydrobiologii
|
2000
|
tom 47
|
nr 2
16

Genetic similarity of Polish Sphagnum species on the base of RAPD and ISJ markers

45%
Polok K., Holdynski C., Sawicki J., Szczecinska M., Zielinski R.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
17

Genetic characteristics of Pinus sylvestris fo. turfosa Woerl from the Gazwa Reserve, North-Eastern Poland

45%
Polok K., Pisarek W., Urbaniak L., Korzekwa K., Zielinski R.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
18

Genetic similarity of Polish Polygonatum species on the base of RAPD and ISJ markers

45%
Polok K., Holdynski C., Szczecinska M., Sawicki J., Zielinski R.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
2005
|
tom 72
19
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Needle anatomy suggests hybridization between the relict turfosa form of Pinus sylvestris L. from the Gazwa peat bog and typical Scots pine

39%
Urbaniak L., Przybyla M., Pisarek W., Chudzinska E., Zielinski R., Polok K.
Acta Societatis Botanicorum Poloniae
|
2009
|
tom 78
|
nr 1
29-36
The aim of this study was to characterize the turfosa form of Pinus sylvestris from the Gazwa peat bog reserve in terms of 16 anatomical needle traits and to determine whether pines with a typical morphotype inhabiting the peat bog have been so successful thanks to hybridization with the unique tufosa ecotype. Investigations were conducted on three phenotypic groups of Scots pine growing in the peat bog. The first two groups consisted of 30 tufosa trees at the age of 117-217 years and 20 trees at the age of 30-85 years. The third group consisted of typical pines represented by 10 trees at the age of 20-55 years. In total 30 trees of typical pine, surrounding the peat bog, at the age of 100-150 years served as outgroup. Descriptive statistics, analysis of variance with the F test, Tukey's test, and a number of multivariate analyses were used to estimate differences between the studied groups of trees based on 16 anatomical needle characteristics. The old turfosa form from the Gazwa reserve proved to be a unique and relict peat bog pine, as it was shown by the differences in 10 analyzed needle traits in comparison to pine with a typical morphotype growing in the areas surrounding the peat bog. The young typical pines have adapted to conditions found in the peat bog owing to hybridization with the turfosa forms. The young turfosa trees differed from the old turfosa trees and also they have probably been of a hybrid origin. The old turfosa form from the Gazwa reserve is a threatened ecotype due to its hybridization with pines from the population surrounding the peat bog.
20
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Content available

Distribution, genetic structure and ecological role of Dreissena polymorpha (Pallas) in Lake Dabie, Western Pomerania, Poland

39%
Piesik Z., Zielinski R., Wachowiak-Zielinska M., Ochman T., Soroka M., Polok K.
Baltic Coastal Zone. Journal of Ecology and Protection of the Coastline
|
1998
|
tom 02
Dreissena polymorpha inhabits about 46.5% of the bottom area in Lake Dabie. It is most abundant in the northern part of the lake and sporadically occurs in its southern part. The average density of the zebra mussel is 891 individuals/m², while its wet weight is 1374 g/ m². In the settled areas the density of the zebra mussel reaches 1734 individuals/ m². There were presently established 7 age-groups from 0 to 6+. The highest number of specimens occurred in the age-groups between 1+ and 3+, while the lowest number - in the groups 0, 5 and 6+. Strong eutrophication and pollution of Lake Dabie on its southern side, combined with sedimentation of the extensive amounts of seston carried in by the Płonia and Regalica rivers, do not create favourable conditions for development of Dreissena. D. polymorpha plays a very positive role in the lake ecosystem through its biofiltrating action, contributing thus to an increase of water clarity and to limitation of phytoplankton development through cumulating nutrients in its biomass. Electrophoretic analysis of 9 enzymatic loci revealed strong polymorphism of the studied population of the zebra mussel: percent of polymorphic loci - 100, mean number of alleles in locus – 3.4, coefficient of expected heterozygosity per locus in the population, HS - 0.335, percentage of separate genotypes - 69%, in this number unique genotypes - 58%. A very strong scattering of the alleles was stated within the entire population. In each aggregation, on average, 90% of the specimens have a separate genotype. Each of the five defined groups of D. polymorpha, representing profiles I-V, respectively, had similar genetic composition. The values of the genetic similarity among the studied groups of the zebra mussel ranged from 0.96 to 0.99.
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