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1

Different pathways of embryo sac development in Galinsoga parviflora Cav.

100%
Pietrusiewicz J., Domaciuk M., Bednara J.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2005
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tom 47
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nr 1
2

Pre- and post-pollination mechanisms affecting seed formation in alfalfa (Medicago sativa L.)

100%
Mol R., Wlodarczyk A., Weigt D., Broda Z.
Acta Biologica Cracoviensia. Series Botanica. Supplement
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2014
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tom 56
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nr 1
3

Relationship between pre-anthesis development and seed formation in spring rape (Brassica napus L.)

84%
Kazlauskiene D.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2005
|
tom 47
|
nr 1
4

Effects of open and self pollination of four cultivars of highbush blueberry [Vaccinium corymbosum L.] on flower fertilization, fruit set and seed formation

84%
Bieniasz M.
Journal of Fruit and Ornamental Plant Research
|
2007
|
tom 15
5

The genetic and molecular analysis of apomixis in the model plant Hieracium

84%
Koltunow A. M.
Acta Biologica Cracoviensia. Series Botanica
|
2000
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tom 42
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nr 2
The dicotyledonous genus Hieracium contains apomictic and sexual species, and is used as a model to study apomixis at the molecular level. Apomixis is facultative and occurs by apospory followed by autonomous embryo and endosperm formation. The sexual pathway initiates first, then apomixis begins with the differentiation of initial cells, and in the more successful apomicts the apomictic pathway displaces the sexual. Genetic analysis showed that apomictic seed set is dependent on the activity of a dominant locus and also modifiers that can influence the fate of initial cell development. The initiation of apomixis is presaged by the altered expression of a DEFICIENS homologue. Initiation of apomixis is not related to alterations in callose deposition or ß-l,3-glucanase activity as has been proposed in other apomicts. Ablation of ovule tissues showed that the funiculus or substances flowing through it exert a negative effect on aposporous initial cell formation. Initial cells were capable of forming embryo sacs, embryos and endosperm in the altered context of ovule development resulting from funicular cell ablation. Signals from surrounding ovule tissues might therefore play a role in directing initial cell fate and the progression of apomixis. We propose that the apomixis locus confers the potential for the components of apospory and autonomous embryo and endosperm development, while other genes that normally regulate ovule and seed maturation may act as modifiers. The combination of locus and modifier activity results in a particular mode of apomixis. The locus and the modifiers require characterization to effectively manipulate apomixis in crops where this beneficial trait is largely absent.
6

Heterogeneity of carrot seeds depending on their position on the mother plant

67%
Panayotov N.
Folia Horticulturae
|
2010
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tom 22
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nr 1
7
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Influence of environmental factors on reproduction of polar vascular plants

67%
Kellmann-Sopyla W., Pastorczyk M., Gielwanowska I.
Papers on Global Change
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2011
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nr 18
In the last few decades, changes of reproductive pattern of polar vascular plants have been observed, for the benefit of generative propagation. The reasons for this phenomenon are attributed to intensively following climate change, whose effects may be various. Warming causes the production of the greater number of generative structures, with higher quality. Our macroscopic observations conducted on specimens of polar vascular plants, cultivated in University of Warmia and Mazury greenhouse, indicate that the effect of temperature increase on flower development and seed formation is inconsistent. On the other hand enhanced levels of UV-B radiation can negatively affect seedlings. The complexity of the climate change causes tremendous difficulties in defining a clear and unquestioned way of modifications during the reproductive phase of the described plants.
8

Wplyw miejsca wytworzenia nasion na pedzie jako czynnik roznicujacy mase i sklad chemiczny nasion odmian bobiku

59%
Zajac T., Pisulewska E.
Acta Agraria et Silvestria. Series Agraria
|
1998
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tom 36
105-124
Studies on development of morphological traits in genetically diversified filed bean cv, (Nadwiślański - traditional cv., Tinos - self-terminating cv.) were conducted in 1996-1997. The plant productivity analysis included the site of seed formation on shoot, i.e. their location on the shoot - a tactor differentiating the share of individual segments of fruiting part of the shoot in yield structure formation and in chemical composition of seeds. Two-factor model of variance analysis with interaction was applied in the calculation as a basis for determination of significance of differences of studied features. Means, standard deviations and range were determined, as well as phenotypic correlations between features. As a result of the investigations it was found that total yield, seed yield of individual plants and yield indicator revealed changes caused mainly by the year of cultivation and chosen variety. A number of seeds per plant the best described it productivity (R2 = 0.9) irrespective of the variety. Pods grouped in the middle segment of fruiting shoot part had the greatest share in the amount of yield. Contents of basic nutrients, i.e. total protein, crude fibre and raw fat in seeds did not change depending on the site of their formation on the shoot. Opposite tendencies were detected as regard tannins and tripsine inhibitors whose higher contents were found in the seeds from the upper section of fruiting shoot. It was particularly visible in self-terminating variety.
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