Wyniki wyszukiwania

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Variation in fatty acid composition of oil from achenes in some species of the family Asteraceae

100%

Kiss A. S., Kastori R., Pucarevic M., Holly L., Vorosvary G., Stefanovits-Banyai E., Horvath L., Sekulic P., Takacs-Hajos M.

Journal of Elementology

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2005

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tom 10

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nr 4 Suppl.1

41-42

2

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The effect of achene heteromorphism on germination in the shaggy soldier [Galinsoga ciliata (Rafin) S.F. Blake]

100%

Kucewicz M., Wardzynska A., Zrobek-Sokolnik A.

Acta Agrobotanica

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2011

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tom 64

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nr 1

Heteromorphic achenes are formed within each capitulum of Galinsoga ciliata (Rafin) S.F. Blake. We examined (1) the effects of the duration of dry storage on germination and (2) the effect of burial in soil on viability and germination of heteromorphic diaspores. Fresh harvested peripheral achenes remained dormant, while central achenes germinated at 60%. Both achene types became non-dormant after one month of dry storage. In successive months of dry storage, peripheral achenes demonstrated a higher germination percentage than central achenes. The peripheral and central achenes showed similar temperature requirements during dry storage. A similar germination pattern was observed in both achene types, with a germination peak in March (96% of peripheral achenes at 12, 26 and 34oC; 90% of central achenes at 26 and 34oC). The germination capacity deteriorated over time. After 19 months of dry storage, both achene morphs failed to germinate at 12oC. At a 26o and 34oC, the same group of achenes continued to germinate at a relatively high level. After six and seven months of soil storage, 90-95% of both achene types remained alive. Dimorphic achenes were characterized by similar germination percentage (89-99%) at all temperature intervals, whereas peripheral achenes exhumed in May were the fastest to germinate. After 18 months of storage in soil (successive growing season), most of the harvested achenes were dead. The studied achenes did not form a permanent seed bank.

3

The effect of achene heteromorphism on progeny traits in the shaggy soldier [Galinsoga ciliata (Rafin) S. F. Blake]

100%

Kucewicz M., Gojlo E., Kowalska A.

Acta Agrobotanica

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2010

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tom 63

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nr 2

The shaggy soldier [Galinsoga ciliata (Rafin) S. F. Blake], family Asteraceae] is an invasive species that poses a growing threat to crop production. This annual plant produces heteromorphic achenes in a capitulum type inflorescence. The objective of this study was to compare selected morphological and phenological parameters and the success of generative reproduction in plants developed from peripheral and central achenes of the capitulum. The somatic variability of G. ciliata diaspores contributed to differences in the growth rates, development and fertility of the resulting populations. The progeny of central diaspores developed at a slower rate than the individuals derived from peripheral achenes, but at the end of their life cycle, the offspring of dimorphic achenes formed homogenous groups as regards height values. On average, the initial phenophases of G. ciliata plants derived from central achenes began one day later, and they entered the flowering stage eight days later than the individuals developed from peripheral seeds. At the initial growth stage (experimental day 65 to 83), the progeny of central achenes produced fewer capitula. On day 133, the individual fertility of the plants derived from central diaspores was 10% higher on average in comparison with the offspring of peripheral achenes.

4

Reduced pollen viability and achene development in Solidago x niederederi Khek from Poland

84%

Migdalek G., Kolczyk J., Pliszko A., Koscinska-Pajak M., Slomka A.

Acta Societatis Botanicorum Poloniae

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2014

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tom 83

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nr 3

Pollen and achene characters of natural interspecific hybrid Solidago ×niederederi Khek were analyzed and compared with putative parental species S. virgaurea L. and S. canadensis L. to estimate the level of disturbances in generative reproduction resulting from its hybrid nature. Pollen viability (stainability) of Solidago ×niederederi from one newly discovered locality in NE Poland was evidently reduced to ~65% in both viability tests (acetocarmine and Alexander). The diameter of viable pollen (median 21.11 μm) fell between S. canadensis (median 19.52 μm) and S. virgaurea (median 23.48 μm). Both parental species produced normally developed achenes with high frequency (~90%) whereas in the hybrid, the seed set was dramatically low (6%). The results clearly indicated that sexual reproduction of hybridogenous taxon S. ×niederederi is disturbed, and its potential impact as an invasive species depends mainly on vegetative propagation.

5

Characteristics of achenes in Potentilla collina group [Rosaceae]

84%

Kolodziejek J., Gabara B.

Acta Societatis Botanicorum Poloniae

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2007

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tom 76

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nr 1

Achenes morphology in taxa from Potentilla collina s.l. i.e., P. collina Wibel s.s., P. leucopolitana P.J. Müller, P. thyrsiflora Hülsen ex Zimmet., P. thyrsiflora var. isosepala Th. W., P. silesiaca Uechtr. And P. wimanniana Günther and Schummel was examined with stereoscope and scanning electron microscopy. Achenes of these taxa varied slightly in shape, size and colour, while marked differences among them appeared in the surface sculpture and in the dimensions of aril, dorsal ridge and ribs. SEM analyses allowed to distinguish two distinct morphological types of achenes. Type I - with ruminate sculpture and aggregates of some material, various in shape and size, at the surface of partly destroyed epidermal cells covering fruit wall in P. leucopolitana, P. wimanniana and P. thyrsiflora. Type II - with ruminate-reticulate sculpture due to well preserved epidermal cells in P. silesiaca and P. thyrsiflora var. isosepala. The obtained results have supported Błocki’s suggestion to treat P. thyrsiflora var. isosepala as a separate species named P. isosepala. However, similarities in the surface sculpture of achenes in some taxa of P. collina group did not facilitate their classification, therefore this feature may be a valuable taxonomical criterium only in combination with others.

6

Wplyw czynnikow siedliskowo-agrotechnicznych na wybrane cechy nielupek z roznych partii koszyczka u oleistych form slonecznika zwyczajnego [Helianthus annuus L.]

67%

Kluza-Wieloch M., Musnicki C.

Rośliny Oleiste - Oilseed Crops

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2004

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tom 25

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nr 2

461-477

7

Dynamika zmian jakosciowych nielupek slonecznika zwyczajnego [Helianthus annuus L.] w trakcie ich dojrzewania

67%

Kluza-Wieloch M., Musnicki C.

Rośliny Oleiste - Oilseed Crops

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2006

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tom 27

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nr 2

231-242

8

The vascular system ontogenesis in the achene of Ranunculus lanuginosus L.

67%

Trzaski L.

Acta Biologica Silesiana

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1993

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tom 24

46-61

9

Anatomical study on the developing pericarp of selected Rosa species (Rosaceae)

67%

Guzicka M., Zielinski J., Tomaszewski D., Gawlak M.

Dendrobiology

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2012

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tom 68

Results of anatomical studies on the developing pericarp of selected wild roses are presented. Using SEM and CLSM, the changes in the pericarp structure of 5 species have been observed during its formation, from the flowering stage to fully ripe achenes. In the morphological development of the pericarp of Rosa species two main phases can be distinguished: the phase of intensive growth of the pericarp during which the fruit achieves its final shape and volume, and the subsequent phase of pericarp ripening when no significant morphological changes in the pericarp occur. Similarly, in the process of the anatomical development of the pericarp two phases are noticeable, however, during both stages, great internal changes proceed in the fruit. The first phase consists of intensive cell divisions and enlargement, gradual thickening of cell walls and formation of all pericarp layers. Due to these changes, the pericarp achieves its final anatomical structure. The second phase, involving the pericarp ripening, is manifested in the modification of cell walls, mainly by their quick thickening, but first of all by their lignification. The lignification of pericarp cell walls begins in the inner endocarp; it proceeds in the outer endocarp, later in mesocarp and finishes in the hypodermal cells of the exocarp. The epidermal cells remain alive the longest and their walls do not (or hardly) become lignified. The death of all cells finishes the pericarp ripening.

10

Dynamika zmian ilosciowych nielupek slonecznika zwyczajnego [Helianthus annuus L.] podczas ich dojrzewania

51%

Kluza-Wieloch M., Musnicki C.

Rośliny Oleiste - Oilseed Crops

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2005

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tom 26

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nr 2

349-359

Ograniczanie wyników

Variation in fatty acid composition of oil from achenes in some species of the family Asteraceae

The effect of achene heteromorphism on germination in the shaggy soldier [Galinsoga ciliata (Rafin) S.F. Blake]

The effect of achene heteromorphism on progeny traits in the shaggy soldier [Galinsoga ciliata (Rafin) S. F. Blake]

Reduced pollen viability and achene development in Solidago x niederederi Khek from Poland

Characteristics of achenes in Potentilla collina group [Rosaceae]

Wplyw czynnikow siedliskowo-agrotechnicznych na wybrane cechy nielupek z roznych partii koszyczka u oleistych form slonecznika zwyczajnego [Helianthus annuus L.]

Dynamika zmian jakosciowych nielupek slonecznika zwyczajnego [Helianthus annuus L.] w trakcie ich dojrzewania

The vascular system ontogenesis in the achene of Ranunculus lanuginosus L.

Anatomical study on the developing pericarp of selected Rosa species (Rosaceae)

Dynamika zmian ilosciowych nielupek slonecznika zwyczajnego [Helianthus annuus L.] podczas ich dojrzewania