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

Znaleziono wyników: 9

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:  Chondrilla juncea
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

Individual variability of endosperm in apomictic Chondrilla juncea L.

100%
Pajak M.
Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement
|
1997
|
tom 39
|
nr 1
2

Callose deposition in young ovules of apomictic Chondrilla species

88%
Musial K., Koscinska-Pajak M.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2016
|
tom 58
|
nr 1
3

Microspores and pollen grains in triploid Chondrilla juncea L.

75%
Koscinska-Pajak M.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
1999
|
tom 41
|
nr 1
4

Immunodetection of arabinogalactan proteins (AGPs) in apomictic ovules of Chondrilla juncea L.

63%
Chudzik B., Koscinska-Pajak M., Sniezko R.
Acta Biologica Cracoviensia. Series Botanica. Supplement
|
2005
|
tom 47
|
nr 1
5

Intraindividual variability of endosperm in autonomously apomictic Chondrilla juncea L.

63%
Koscinska-Pajak M.
Acta Biologica Cracoviensia. Series Botanica
|
1998
|
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.
6

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

63%
Koscinska-Pajak M.
Acta Biologica Cracoviensia. Series Botanica
|
2000
|
tom 42
|
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.
7

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
|
2005
|
tom 47
|
nr 1
8

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

51%
Koscinska-Pajak M., Bednara J.
Acta Biologica Cracoviensia. Series Botanica
|
2003
|
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.
9

Abnormal embryos in mature seeds of Chondrilla juncea L.

51%
Koscinska-Pajak M.
Acta Biologica Cracoviensia. Series Botanica
|
1999
|
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.
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.