Wyniki wyszukiwania

1

Cytological studies in Salix L. I.

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1980

|

tom 22

|

nr 1

2

Further karyological studies in species of Alchemilla L. from the series Calycinae Bus. (section Brevicaulon Rothm.)

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1982

|

tom 24

3

Obserwacje nad rozwojem zarodka i endospermy u różnych typów chromosomowych apomiktycznego gatunku Ranunculus cassubicus L.

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1967

|

tom 10

|

nr 1

4

Karyological studies in species of Alchemilla L. from the series Calycinae Bus. (section Brevicaulon Rothm.)

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1981

|

tom 23

5

Cytogenetic studies in the apomictic species Ranunculus cassubicus L.

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1970

|

tom 13

|

nr 1

6

Reproductive strategy in the Ranunculus auricomus complex [Ranunculaceae]

100%

Izmailow R.

Acta Societatis Botanicorum Poloniae

|

1996

|

tom 65

|

nr 1-2

167-170

7

Cyto-embrological studies on Alchemilla L. (series Calycinae Buser). II. Apomictic processes in ovules

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1986

|

tom 28

8

Disturbances in embryological processes in Conyza canadensis L. [Asteraceae] in the polluted environment

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica. Supplement

|

2006

|

tom 48

|

nr 1

46

9

Makrosporogeneza u apomiktycznego gatunku Ranunculus cassubicus

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1965

|

tom 08

|

nr 2

10

Cytological studies in Polish representatives of the genus Epilobium L.

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1977

|

tom 20

|

nr 1-2

11

Cyto-embrological studies in experimental hybrids of the apomictic species Ranunculus cassubicus L.

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1973

|

tom 16

|

nr 1

12

Reproduction of Vicia cracca L. in the polluted environment of the Legnica-Glogow Copper Basin [Poland]

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

2000

|

tom 42

|

nr 2

The effects of stress conditions in a polluted environment on the reproductive processes of plants were studied for two successive years. Vicia cracca is a component of the spontaneous green belt at the base of a copper processing post-flotation waste reservoir (Żelazny Most, Legnica-Głogów Copper Basin, Silesia, Poland). Plants from the site were compared with plants derived from seeds harvested from the contaminated site which grew in non-polluted soil on an experimental plot near Cracow. Almost all of the studied flowers showed degenerative tapetal processes in ~50% of the anthers, starting simultaneously in various stages of meiotic divisions in the pollen mother cells. At the tetrad stage nearly 50% of the anthers contained wholly degenerated tetrads. Disturbances in meiosis increased the amount of degenerated pollen grains. The proportion of potentially functional pollen grains was 47% in 1997 and 56% in 1998; in the control material the corresponding proportions were 87% and 84% (1998 and 1999). Various kinds of developmental disturbances and degenerative processes eliminated some of the ovules from the seed production. The percentages of ovules forming seeds was 56% and 59% in successive years (85% and 87% in the control). Most of the disturbances and degeneration can be attributed to the combined negative impacts of specific environmental factors.

13

Further observations in embryo sac development in Alchemilla L. [subsection Heliodrosium Rothm.]

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1994

|

tom 36

Origin of embryo sacs was examined in further two Alchemilla species: A. acutiloba and A. montícola. The central region of multicellular archesporium shows meiotic tendencies but as a rule, the meiotic division did not advance further than up to I ptophase. Apomeiotic embryo sacs arise from unreduced cells, either from megaspore mother cells (diplospory) or from cells of somatic character (apospory). In the same ovule a few embryo sacs of both types may be formed. Usually only one of them reaches a distinct prevalence and the full maturity.

14

Embryology of Hosta in relation to its taxonomic position

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement

|

1997

|

tom 39

|

nr 1

15

Embryological analysis of Aphanes arvensis L. [Rosaceae]

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1999

|

tom 41

The paper deals with the embryology of Aphanes arvensis L. and refers to plant material from Poland. Examination of various developmental stages revealed most characteristic features of sexual reproduction. Only a few ovules showed a tendency to elementary apomictic processes in the form of sporadically observed initial cells or young aposporous embryo sacs. The apomictic processes were not continued, but there is reason to believe they could be completed in some ovules. The results are discussed in a taxonomic context.

16

Reproduction of Vicia cracca L. in polluted environment of the Legnica-Glogow Copper Basin

100%

Izmailow R.

Acta Biologica Cracoviensia. Series Botanica. Supplement

|

1999

|

tom 41

|

nr 1

17

Embryo and endosperm relations at early stages of their development in lchemilla subsect. Heliodrosium [Rosaceae]

100%

Izmailow R.

Polish Botanical Studies

|

1994

|

tom 08

18

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Cyto-embryological studies in various cytotypes of Ranunculus cassubicus L.

75%

Izmailow R.

Genetica Polonica

|

1971

|

tom 12

|

nr 3

19

Ovules, female gametophytes and embryos are more sensitive to heavy metal pollution than anthers and pollen of Cardaminopsis arenosa (L.) Hayek (Brassicaceae), a member of calamine flora

63%

Kwiatkowska M., Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

2014

|

tom 56

|

nr 1

20

Further studies in chromosome numbers of Polish Angiosperms. Part XVII

63%

Pogan E., Izmailow R.

Acta Biologica Cracoviensia. Series Botanica

|

1983

|

tom 25

Ograniczanie wyników

Cytological studies in Salix L. I.

Further karyological studies in species of Alchemilla L. from the series Calycinae Bus. (section Brevicaulon Rothm.)

Obserwacje nad rozwojem zarodka i endospermy u różnych typów chromosomowych apomiktycznego gatunku Ranunculus cassubicus L.

Karyological studies in species of Alchemilla L. from the series Calycinae Bus. (section Brevicaulon Rothm.)

Cytogenetic studies in the apomictic species Ranunculus cassubicus L.

Reproductive strategy in the Ranunculus auricomus complex [Ranunculaceae]

Cyto-embrological studies on Alchemilla L. (series Calycinae Buser). II. Apomictic processes in ovules

Disturbances in embryological processes in Conyza canadensis L. [Asteraceae] in the polluted environment

Makrosporogeneza u apomiktycznego gatunku Ranunculus cassubicus

Cytological studies in Polish representatives of the genus Epilobium L.

Cyto-embrological studies in experimental hybrids of the apomictic species Ranunculus cassubicus L.

Reproduction of Vicia cracca L. in the polluted environment of the Legnica-Glogow Copper Basin [Poland]

Further observations in embryo sac development in Alchemilla L. [subsection Heliodrosium Rothm.]

Embryology of Hosta in relation to its taxonomic position

Embryological analysis of Aphanes arvensis L. [Rosaceae]

Reproduction of Vicia cracca L. in polluted environment of the Legnica-Glogow Copper Basin

Embryo and endosperm relations at early stages of their development in lchemilla subsect. Heliodrosium [Rosaceae]

Cyto-embryological studies in various cytotypes of Ranunculus cassubicus L.

Ovules, female gametophytes and embryos are more sensitive to heavy metal pollution than anthers and pollen of Cardaminopsis arenosa (L.) Hayek (Brassicaceae), a member of calamine flora

Further studies in chromosome numbers of Polish Angiosperms. Part XVII