Wyniki wyszukiwania

1

Wybitny uczony, dobry czlowiek - wspomnienie o prof.dr hab. Romanie Czapik [26 I 1929 - 21 II 2008]

100%

Koscinska-Pajak M.

Wiadomości Botaniczne

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2008

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tom 52

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nr 3-4

96-106

2

Disturbances in the formation of pollen grains in Rudbeckia bicolor Nutt.

100%

Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica

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1990

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tom 32

3

Intraindividual variability of endosperm in autonomously apomictic Chondrilla juncea L.

100%

Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica

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1998

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tom 40

The data concerning endosperm type in Chondrilla juncea L. from Europe, Asia and Australia have been the subject of controversy. This study investigated the problem embryologically in an individual plant growing on an experimental field. Two endosperm types, nuclear and cellular, were observed to be present in inflorescences of the same plant. Both types of endosperm were formed after open pollination as well as after emasculation; however, cellular endosperm predominated slightly after open pollination. The development of endosperm preceded embryo development independently of endosperm type. Intraspecific variability of endosperm type in the investigated plant seems to be genetically conditioned, and it may be modified by external conditions.

4

Microspores and pollen grain in triploid Chondrilla juncea L. from unpolluted and polluted areas

100%

Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica

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2000

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tom 42

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nr 2

Preliminary observations of plants collected at a natural locality in Jany (Zielona Góra district, Poland) suggested that in some plants dyads occurred mixed with more or less regular tetrads, monads, triads and polyads. Similar results were obtained in plants growing on an unpolluted site at an experimental field in Modlnica near Cracow and in a highly polluted area close to a postfloatation reservoir at the Żelazny Most copper mine near Rudna (Silesia). However, in the plants growing in contaminated soil a higher degree of degeneration processes was observed. Either dyads or tetrads prevailed in the capitula in the analyzed plants. In some of their loculi, dyads and tetrads were mixed with monads, dyads, triads and/or polyads. Microcytes and pollen grains of different sizes were common. The sterility of mature pollen grain was slightly higher in a plant from Żelazny Most (80-85%) than in its derivative from Modlnica (65-75%). Degeneration of whole anthers in the plant from the polluted locality was frequent. In some anthers the destruction of meiocytes started early, together with precocious abortion of the anther tapetum.

5

Microspores and pollen grains in triploid Chondrilla juncea L.

100%

Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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1999

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tom 41

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nr 1

6

Abnormal embryos in mature seeds of Chondrilla juncea L.

100%

Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica

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1999

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tom 41

Observations were made of 200 embryos prepared from ripe achenes of Chondrilla juncea collected after open pollination. The majority of seeds (60%) contained a single embryo with two regularly formed cotyledons. Embryos with three more or less equal cotyledons were observed in 5% of the seeds, and twins were found in 6%. Some (20%) contained embryos with split cotyledons and a regularly developed radicle, and others had both the cotyledons and radicle split. Embryo sacs (ESs) with delayed globular embryos surrounded by degenerating endosperm were dissected from 9% of the seeds whose color and size indicated that they should be fully developed.

7

Callose in the ovules of apomictic and amphimictic angiosperms – new data

63%

Koscinska-Pajak M., Musial K.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2018

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tom 60

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nr 1

8

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Egg apparatus in sexual and apomictic species of Taraxacum: Structural and immunocytochemical aspects of synergid cells

63%

Musial K., Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica

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2013

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tom 55

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nr 1

The paper reports a comparative study of the female gametophyte and especially synergid structure in sexual and apomictic dandelions. We analyzed diploid sexually reproducing Taraxacum linearisquameum (2n = 2x = 16) and two triploids, T. alatum and T. udum (2n = 3x =24), with autonomous embryo and endosperm development. There were no observed differences in the organization of the mature megagametophyte between the examined species. Both meiotically reduced and diplosporous embryo sacs showed typical polarity of the egg apparatus cells, together with development of a filiform apparatus in the synergids, but immunocytochemical analyses indicated that microtubules form longitudinal brush-like bundles adjacent to the filiform apparatus in the synergids of the sexual T. linearisquameum. This arrangement of cytoskeletal elements is similar to the configuration described in other amphimictic plants. The synergids of the apomictic T. alatum and T. udum show a uncharacteristic and relatively weak cytoskeleton with no brush-like bundles. We discuss the role of synergids in autonomous apomicts.

9

Callose deposition in young ovules of apomictic Chondrilla species

63%

Musial K., Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2016

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tom 58

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nr 1

10

Apomiksja - aktualna problematyka badan w zakresie embriologii i genetyki molekularnej

63%

Koscinska-Pajak M., Sniezko R.

Annales Universitatis Mariae Curie-Skłodowska. Sectio EEE: Horticultura

|

2003

|

tom 13

53-62

11

Embryological investigation of apomictic taxa conducted at the Department of Plant Cytology and Embryology of the Jagiellonian University - a continuation of research initiated by Professor Romana Czapik

63%

Koscinska-Pajak M., Musial K.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2016

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tom 58

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nr 1

12

Microtubule patterns and organelles during microsporogenesis in apomictic Chondrilla juncea L.

63%

Koscinska-Pajak M., Bednara J.

Acta Biologica Cracoviensia. Series Botanica

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2003

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tom 45

|

nr 2

This study investigated patterns of cytoskeletal organization during microsporogenesis in Chondrilla juncea L., an autonomous apomict with a triploid chromosome number (2n = 15). The distribution of microtubules and organelles is not typical. The microtubules do not form a normal phragmoplast and consequently the organelle equatorial plate observed in many taxons is not present. The organelles are dispersed randomly in both the central and peripheral parts of the cytoplasm.

13

Apomictic phenomena in plant tissue culture

63%

Czapik R., Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2000

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tom 42

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nr 1

14

Frequency of apomixis in seed plants of Poland

63%

Czapik R., Koscinska-Pajak M.

Folia Morphologica

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1998

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tom 57

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nr 1

15

Embryo and endosperm in Rudbeckia bicolor Nutt. - resumption of study

51%

Musial K., Koscinska-Pajak M., Sliwinska E., Ilnicki T.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2005

|

tom 47

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nr 1

16

Immunocytochemical investigation of the egg apparatus in selected sexual and apomictic species of Taraxacum

51%

Koscinska-Pajak M., Musial K., Bednara J.

Acta Societatis Botanicorum Poloniae

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2010

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tom 79

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nr Suppl.1

17

Early embryological processes in the ovules of Erigeron annuus (Asteraceae)

51%

Topor I., Koscinska-Pajak M., Musial K.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2018

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tom 60

|

nr 1

18

Embryological processes during the seed formation in two triploid species of Taraxacum

51%

Janas A., Musial K., Koscinska-Pajak M.

Acta Scientiarum Polonorum. Agricultura

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2015

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tom 14

|

nr 2

The present paper reports on our observations on embryological processes occurring in the ovules of triploids: Taraxacum belorussicum (sect. Palustria) and T. atricapillum (sect. Borea). The reproduction of these dandelions comprises meiotic diplospory, parthenogenesis and autonomous endosperm development. Mature seeds contain viable embryos that provide regular seedlings. At present the importance of cytological and embryological studies of apomicts is specially emphasized because Taraxacum is one of the model genus for investigations of apomixis. It forms a polyploid complex within which there is a close relationship between the mode of reproduction and the ploidy level: diploids reproduce sexually, whereas polyploids are apomicts. Apomixis is of a great interest in plant breeding because it allows clonal seed production but asexual seeds formation by apomixis is not found in any crop plants. Unfortunately, to date any attempts at introducing of apomixis into crop species have failed. It is worth mentioning that dandelions are valuable honey plants and numerous species of Taraxacum are also used in modern herbal medicine.

19

Study of megasporogenesis and female gametophyte formation in Taraxacum belorussicum Val. N. Tikhom. (sect. Palustria) using Nomarski DIC optics

51%

Janas A., Musial K., Koscinska-Pajak M.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2014

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tom 56

|

nr 1

20

Structural and biochemical changes in the micropylar region of Chondrilla juncea apomictic ovule

51%

Koscinska-Pajak M., Chudzik B., Zarzyka B., Pawelec J.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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2005

|

tom 47

|

nr 1

Ograniczanie wyników

Wybitny uczony, dobry czlowiek - wspomnienie o prof.dr hab. Romanie Czapik [26 I 1929 - 21 II 2008]

Disturbances in the formation of pollen grains in Rudbeckia bicolor Nutt.

Intraindividual variability of endosperm in autonomously apomictic Chondrilla juncea L.

Microspores and pollen grain in triploid Chondrilla juncea L. from unpolluted and polluted areas

Microspores and pollen grains in triploid Chondrilla juncea L.

Abnormal embryos in mature seeds of Chondrilla juncea L.

Callose in the ovules of apomictic and amphimictic angiosperms – new data

Egg apparatus in sexual and apomictic species of Taraxacum: Structural and immunocytochemical aspects of synergid cells

Callose deposition in young ovules of apomictic Chondrilla species

Apomiksja - aktualna problematyka badan w zakresie embriologii i genetyki molekularnej

Embryological investigation of apomictic taxa conducted at the Department of Plant Cytology and Embryology of the Jagiellonian University - a continuation of research initiated by Professor Romana Czapik

Microtubule patterns and organelles during microsporogenesis in apomictic Chondrilla juncea L.

Apomictic phenomena in plant tissue culture

Frequency of apomixis in seed plants of Poland

Embryo and endosperm in Rudbeckia bicolor Nutt. - resumption of study

Immunocytochemical investigation of the egg apparatus in selected sexual and apomictic species of Taraxacum

Early embryological processes in the ovules of Erigeron annuus (Asteraceae)

Embryological processes during the seed formation in two triploid species of Taraxacum

Study of megasporogenesis and female gametophyte formation in Taraxacum belorussicum Val. N. Tikhom. (sect. Palustria) using Nomarski DIC optics

Structural and biochemical changes in the micropylar region of Chondrilla juncea apomictic ovule