Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 11

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  apomixis
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Exogenous steroid hormones stimulate full development of autonomous endosperm in Arabidopsis thaliana

100%
Rojek J., Pawelko L., Kapusta M., Naczk A., Bohdanowicz J.
Acta Societatis Botanicorum Poloniae
|
2015
|
tom 84
|
nr 2
Most flowering plants, including important crops, require double fertilization to form an embryo and endosperm, which nourishes it. Independence from fertilization is a feature of apomictic plants that produce seeds, from which the plants that are clones of the mother plant arise. The phenomenon of apomixis occurs in some sexual plants under specific circumstances. Since the launch of a fertilization-independent mechanism is considered a useful tool for plant breeding, there have been efforts to artificially induce apomixis. We have been able to produce fertilization-independent endosperm in vitro in Arabidopsis over the last few years. This paper demonstrates the methods of improving the quality of the endosperm obtained using plant and mammalian steroid hormones. Additionally, it shows the study on the autonomous endosperm (AE) formation mechanism in vitro. This paper examines the effect of exogenous steroid hormones on unfertilized egg and central cell divisions in culture of unpollinated pistils of Arabidopsis Col-0 wild-type andfie-1 mutant. All media with hormones used (estrone, androsterone, progesterone, and epibrassinolide) stimulated central cell divisions and fertilization-independent endosperm development. The stages of AE development followed the pattern of Arabidopsis thaliana wild type after fertilization. Subsequent stages of AE were observed from 2-nuclear up to cellular with the most advanced occurring on medium with 24-epibrassinolide and progesterone. The significant influence of mammalian sex hormones on speed of AE development and differentiation was noticed. Using restriction analysis, the changes in methylation of FIE gene was established under in vitro condition. The authors of this paper showed that Arabidopsis thaliana has a high potency to fertilization-independent development.
2

Sporogenesis and embryo development in apomictic Poa pratensis genotypes

86%
Wojciechowski A., Niemann J.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2014
|
tom 56
|
nr 1
3

Apomixis - preliminary lessons from wheat egg cells, Poa pratensis, Hypericum perforatum and Arabidopsis thaliana

86%
Matzk F., Prodanovic S., Czihal A., Tiedemann J., Koszegi D., Arzenton F., Blattner F., Kumlehn J., Altschmied L., Schubert I., Johnston A., Grossniklaus U., Baumlein H.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2005
|
tom 47
|
nr 1
4
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Identification of apomixis in the Kentucky bluegrass (Poa pratensis L.) using auxin test

72%
Niemann J., Wojciechowski A., Janowicz J.
Acta Societatis Botanicorum Poloniae
|
2012
|
tom 81
|
nr 3
The effect of auxin treatment on the formation of apomictic – endospermless grains in Poa pratensis was investigated in the study. Four polish cultivars: Skiz, Eska 46, Alicja, Ani as well as six breeding lines: POB 13, SK-W-33, SKW-15, SKW-35A, SK-W-35A and SK-W-35B were tested by embryological methods to reveal the reproduction pathway in greenhouse and field conditions. The obtained results showed that four genotypes, i.e. Alicja, Ani, Eska 46 and SK-W-35B are facultative apomictic and the other have formed seeds only on the apomictic way. In facultative apomicts it was found that in many cases both endospermless ovules containing embryo sacs with embryos or embryo sacs with well developed endosperm were formed. In the case of apomictic genotypes only endospermless seeds were observed.
5

Tendency towards facultative apomixis in breeding lines of sugar beet (Beta vulgaris L., Chenopodiaceae)

72%
Szkutnik T.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2005
|
tom 47
|
nr 1
6

Embryo sac development on facultative apomixis in Woonyoungia septentrionalis (Dandy) Law

72%
Ye X.-L., Zeng Q.-W., Wang Y.-Q., Liang C.-Y.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2005
|
tom 47
|
nr 1
7
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Immunolocalization of pectins and arabinogalactan proteins in young ovules of selected amphimictic and apomictic species of the asteraceae family

72%
Janas A. B., Marciniuk J., Musial K.
Acta Biologica Cracoviensia. Series Botanica
|
2023
|
tom 65
|
nr 1
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Spatial structure of a natural mixed topodeme of subalpine Sorbus taxa

58%
Gomory D., Krajmerova D.
Acta Societatis Botanicorum Poloniae
|
2008
|
tom 77
|
nr 4
305-311
Spatial distribution and genetic variation of a population of Sorbus chamaemespilus (L.) Crantz and putative hybrids between S. chamaemespilus, S. aria and S. aucuparia growing in the nature reserve Skalnä Alpa (central Slovakia) were studied. The analysis of spatial patterns using Ripley's K-function revealed a significant clustering of the adults of both S. chamaemespilus and hybrid taxa at distances up to ~15 m and a strong affinity between both taxonomical groups, indicating similar ecological requirements. Bivariate point-pattern analysis considering cardinal direction showed that juvenile individuals of S. chamaemespilus are clustered around the adults up to the distance of ~2 m, whereas in hybrid taxa with larger and more dense crowns, juveniles are clustered at distances more than ~3 m from the adults. The analysis of genetic variation in a subset of adult shrubs using 4 nuclear microsatellite loci revealed that unlike expected, there was no variation in S. chamaemespilus but several genotypes were found in the group of hybrid taxa. Implications for the reproduction system and conservation of the investigated taxa are discussed.
9

High variability of nuclear DNA content in cultivars and natural populations of Poa pratensis L. in relation to morphological characters

58%
Murovec J., Kastelec D., Vilhar B., Cop J., Bohanec B.
Acta Biologica Cracoviensia. Series Botanica
|
2009
|
tom 51
|
nr 2
45-52
Kentucky bluegrass is a facultative apomict which is propagated from seeds of variable genetic origins, ploidy levels and nuclear DNA contents. This study analyzes the variability of relative nuclear DNA content among cultivars and natural populations, and examines whether this variability is correlated with morphological traits. Relative nuclear DNA content (an indirect measure of chromosomal variability) was determined in 281 plants from 28 accessions (17 cultivars, 11 populations) using flow cytometry of DAPI-stained nuclei. The same plants were also measured for leaf area and stomatal length. Variation of measured relative DNA content between the studied accessions was very high (5.5-fold). Intra-accession variation was very high in six accessions, even though three of these were cultivars. Relative nuclear DNA content was correlated with stomatal length but not with leaf area. The lack of correlation with leaf area might explain why high intra-accession variability of nuclear DNA content was found in released cultivars that had passed uniformity testing during the registration procedure. We suggest that nuclear DNA content measurement should be made part of the cultivar registration process
10

Polyploid progeny from crosses between diploid sexuals and tetraploid apomictic pollen donors in Taraxacum sect. Ruderalia

58%
Martonfiova L., Majesky L., Martonfi P.
Acta Biologica Cracoviensia. Series Botanica
|
2007
|
tom 49
|
nr 1
47-54
The paper reports a study of polyploid progeny of crosses between diploid sexual maternal plants and tetraploid pollen donor plants in the genus Taraxacum sect. Ruderalia. All polyploid progeny plants were triploids; no tetraploids were found. Two types of experiments were done with each plant: crossing of some capitula with diploid pollen donor, and isolation of other capitula. Flow cytometric seed screening, together with analysis of seed set, were used to determine the breeding system of particular hybrids. Of the 29 triploid hybrids studied, 7 plants were apomictic. Seventeen triploid hybrids produced progeny sexually, reduced ovules were fertilized, and seed set was low. Three plants produced (near)tetraploid progeny - BIII hybrids with autonomous endosperm. The remaining 2 triploid hybrids were nonapomicts, but their type could not be distinguished. Compared with the crosses with triploid pollen donors, the crosses of diploid with tetraploid pollen donors produced fewer apomictic progeny and more nonapomictic progeny with reduced, irregular chromosome numbers. However, the total number of developed seeds per capitulum was substantially higher in diploid x tetraploid crosses, and their impact in microevolutionary processes may be considerable. In both types of crosses, diplosporous plants lacking the capacity for parthenogenesis were produced, confirming the breakdown of apomixis into its elements.
11

Apomiksja i perspektywy jej wykorzystania w hodowli roslin

51%
Szota M.
Biuletyn Instytutu Hodowli i Aklimatyzacji Roślin
|
1997
|
nr 202
27-33
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.