Wyniki wyszukiwania

1

Effect of cytoplasm containing immaturin - a protein controlling mating immaturity - on the occurrence of autogamy in Paramecium tetraurelia

100%

Kosciuszko H., Prajer M.

Folia Biologica

|

1995

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tom 43

|

nr 1-2

2

Nuclear phenomena during autogamy in the marine ciliate Euplotes crassus: a tangled cytogenetic process fostering evolutionary conservatism

86%

Dini F., Raikov I. B., Bracchi P.

Acta Protozoologica

|

1999

|

tom 38

|

nr 1

3

Glucose, sorbitol and insulin as exogenous agents that monitor the interautogamous interval [IAI] in Paramecium primaurelia

86%

Prajer M.

Folia Biologica

|

2005

|

tom 53

|

nr 3-4

4

Anomalies of autogamy in Paramecium tetraurelia temperature sensitive mutant induced by heat treatment

86%

Prajer M., Iftode F.

Folia Biologica

|

2001

|

tom 49

|

nr 1-2

5

Transplantation of Paramecium tetraurelia cytoplasm committed irreversibly to autogamy, into cells immature for this process. Absence of evidence for a cytoplasmic autogamy inducing factor in Paramecium tetraurelia

86%

Kosciuszko H., Prajer M.

Folia Biologica

|

1997

|

tom 45

|

nr 1-2

6

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Notes on the self-pollination in Dendrobium biflorum (Orchidales, Dendrobiinae)

72%

Kowalkowska A. K., Margonska H. B.

Acta Societatis Botanicorum Poloniae

|

2012

|

tom 81

|

nr 3

The conditions favouring self-pollination are determined for a species of Dendrobium Sw. A survey of gynostemium micromorphology in collected flowers of Dendrobium biflorum revealed two stages of a unique form of autogamy: on germination of pollen tetrads, pollen tubes reached the stigmatic region without the pollen being displaced from the anther locules. This is the first time for this type of autogamy to be reported in Dendrobium biflorum. Pollen grains germinated directly from the locules, bypassing the stigma or falling or sliding down onto the stigmatic surface. The pollen tubes were long and reached the stylar canal. On The Society Islands, differences in exposure of the habitats to weather conditions and altitude gradients influence both composition and form of the vegetation, as well as the occurrence of pollinators. The form of autogamy described here may be the usual method of pollination found on The Society Islands (and even the whole of French Polynesia), where suitable pollinators are absent and/or growth conditions stressful.

7

Length of the interautogamous interval [IAI] in wild and mutant stocks of Paramecium tetraurelia

72%

Prajer M., Kosciuszko H.

Folia Biologica

|

1999

|

tom 47

|

nr 3-4

8

Genetic and epigenetic factors affecting meiosis induction in eukaryotes revealed in Paramecium research

58%

Prajer M.

Folia Biologica

|

2008

|

tom 56

|

nr 1-2

1-11

9

Metaxenia, a mechanism increasing seed variability after interspecific crosses within Arabis hirsuta complex [Cruciferae]

58%

Novotna I., Czapik R.

Acta Biologica Cracoviensia. Series Botanica

|

1994

|

tom 36

The seeds developed after autogamy in four species of the Arabis hirsuta complex: A hirsuta (L.) Scop. (4x), A hornungiana Schur. (4x), A. planisiliqua (Pers.) Reichenb. (2x) and A. sagittata (Bertol.) DC. (2x) were compared with the seeds collected after reciprocal crosses in three combinations: A. hirsuta and A. planisiliqua, A. hirsuta and A. sagittata, A. hornungiana and A. planisiliqua. The comparison has revealed the occurrance of metaxenia expressed in characteristics of seeds with hybrid embryos.

10

Allogamy in Viola odorata L.

58%

Banasinska A., Kuta E.

Acta Biologica Cracoviensia. Series Botanica

|

1996

|

tom 38

Allogamy in chasmogamous flowers of V. odorata (2n = 20) was detected using classical embryology methods and crossing experiments. 48 chasmogamous flowers left to open pollination were analysed. Out of 372 ovules normal, 8-nucleate ESs were observed in 52%; in 40% of ovules zygotes or embryos with endosperm occurred; 8% of ovules studied contained ESs in earlier stages of development. Additionally in several ovules some abnormalities concerning ES structure ahd the origin of embryos were detected. Isolation of 20 chasmogamous flower buds proved that self-fertilization did not occur without the pollen vector. Cross-pollination experiments involving both intra- and inter-population pollination showed that chasmogamous flowers yealded viable seeds after cross-fertilization. Seed germination occurs only after scarification. Scarified seeds germinated under in vitro culture conditions and developed into seedlings. Genetical structure of V. odorata populations depends on many factors discussed in this paper.

11

Cytoplasmic regulation of the interautogamous interval [IAI] in Paramecium tetraurelia

58%

Prajer M., Kosciuszko H.

Folia Biologica

|

1994

|

tom 42

|

nr 1-2

12

The dynamics of Listera ovata populations on mineral islands in the Biebrza National Park

58%

Brzosko E.

Acta Societatis Botanicorum Poloniae

|

2002

|

tom 71

|

nr 3

13

The pollination of Epipactis Zinn, 1757 (Orchidaceae) species in Central Europe – the significance of chemical attractants, floral morphology and concomitant insects

51%

Jakubska-Busse A., Kadej M.

Acta Societatis Botanicorum Poloniae

|

2011

|

tom 80

|

nr 1

A series of studies on pollination biology of the Epipactis atrorubens (Hoffm.) Besser, E. purpurata Sm., and E. palustris (L.) Crantz populations was conducted in Poland, Lithuania and Czech Republic between 2003 and 2010. The research focused on pollinators and visitors to aforementioned orchid species as well as on the chemical analysis of orchids’ nectar which was done using the GC/MS method. It was found that: 1) the type of pollinators depends on the orchid population size and the surrounding environment, where the temperature and amount of precipitation during the vegetative season are the most vital factors; 2) pollinators and visitors to the examined orchids might differ in successive growing seasons; 3) the studied Epipactis species differ in the chemical composition of their nectar and its scent, which can influence their pollination biology; 4) the tendency to autogamy observed in E. purpurata might be due to lack of pollinators in its habitats.

Ograniczanie wyników

Effect of cytoplasm containing immaturin - a protein controlling mating immaturity - on the occurrence of autogamy in Paramecium tetraurelia

Nuclear phenomena during autogamy in the marine ciliate Euplotes crassus: a tangled cytogenetic process fostering evolutionary conservatism

Glucose, sorbitol and insulin as exogenous agents that monitor the interautogamous interval [IAI] in Paramecium primaurelia

Anomalies of autogamy in Paramecium tetraurelia temperature sensitive mutant induced by heat treatment

Transplantation of Paramecium tetraurelia cytoplasm committed irreversibly to autogamy, into cells immature for this process. Absence of evidence for a cytoplasmic autogamy inducing factor in Paramecium tetraurelia

Notes on the self-pollination in Dendrobium biflorum (Orchidales, Dendrobiinae)

Length of the interautogamous interval [IAI] in wild and mutant stocks of Paramecium tetraurelia

Genetic and epigenetic factors affecting meiosis induction in eukaryotes revealed in Paramecium research

Metaxenia, a mechanism increasing seed variability after interspecific crosses within Arabis hirsuta complex [Cruciferae]

Allogamy in Viola odorata L.

Cytoplasmic regulation of the interautogamous interval [IAI] in Paramecium tetraurelia

The dynamics of Listera ovata populations on mineral islands in the Biebrza National Park

The pollination of Epipactis Zinn, 1757 (Orchidaceae) species in Central Europe – the significance of chemical attractants, floral morphology and concomitant insects