Wyniki wyszukiwania

1

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Spontaneous changes in the genome of the red clover ( Trifoloim Pratense L.) I. Trisomity

100%

Strzyzewska C.

Genetica Polonica

|

1984

|

tom 25

|

nr 2

2

Spontaneous changes in genome of red clover ( Trifolium pratense L.) II. Tetrasomity. morphological characters and fertility

100%

Strzyzewska C.

Genetica Polonica

|

1984

|

tom 25

|

nr 4

3

Sib-mating in Trifolium pratense L. I Some morphological traits; properties of euploids, aneuploids and polyploids

100%

Strzyzewska C.

Genetica Polonica

|

1974

|

tom 15

|

nr 3

4

Sib-mating in Trifolium pratense L. II. Cytogenetic of euploids, aneuploids and polyploids

100%

Strzyzewska C.

Genetica Polonica

|

1976

|

tom 17

|

nr 4

5

Hybrids of Trifolium pratense L. [2n - 14 plus 2] with T. diffusum Ehrh. [2n - 16] and other 16-chromosome Trifolium species

100%

Strzyzewska C.

Journal of Applied Genetics

|

1995

|

tom 36

|

nr 1

16-chromosome forms of red clover (2n=14+2) were crossed to six Trifolium species with the chromosome number 2n=16. Hybrid plants were derived from the cross of a stable 16-chromosome red clover T. pratense with T. diffusum (2n=16). No seeds were obtained from reciprocal crosses. F₁ hybrid plants were morphologically more similar to T. diffusum, whereas their other characters, e.g. flower number per head, were intermediate between the species crossed. All F₁ hybrids had the chromosome number 2n=16. Meiosis proceeded with large irregularities. The average number of bivalents per cell was 3.32, and that of univalents - 9.98. Univalents exhibited a high stickiness and frequently formed "end-to-end" configurations and chains consisting of about a dozen of so chromosomes. Bivalents were straight. Lagging chromosomes and chromosome bridges were observed during AI; lagging chromosomes were also found during AII. After an equalizing division, tetrads and different from them microspore polyads were formed. 16-chromosome hybrids were male- and female-sterile. No hybrids were obtained from the stable 16-chromosome red clover T. pratense (n=7 chromosomes) crossed to the selected clover species (T. apertum Bobr., T. alexandrinum L. and others) with n=8 chromosomes.

6

Amphidiploid hybrids of Trifolium pratense L. [2n=14 and 2] with T.diffusum Ehrh. [2n=16]

100%

Strzyzewska C.

Journal of Applied Genetics

|

1995

|

tom 36

|

nr 2

After duplicating the chromosome number by colchicine in sterile F₁ 16-chromosome hybrid T. pratense × T. diffusum some partially fertile plants with 32 chromosomes were found. Male fertility (viability of pollen grain) was from 69.3% to 86.2% (on average 81.8%), whereas female fertility estimated as seed setting after cross- and self-pollination was 21.8% and 6.9%, respectively. Male and female fertility as well as somatic chromosome number were examined in the F₂-F₄ generations. Selection for female fertility resulted in increasing seed setting in the first two generations (F₂ and F₃) and in decreasing it in F₄ generation. An average seed setting in the F₂-F₄ generations after cross-pollination amounted to 22.2%, 43.6% and 12.9%, respectively; after self-pollination it was 25.2%, 27.6% and 1.9%. In the F₂ generation all the plants had 2n=32 chromosomes. In the next generations there appeared aneuploids, among which 30-chromosome individuals were predominant.

7

Species crossing in the genus trifolium L.

51%

Kazimierski T., Kazimierska E. M., Strzyzewska C.

Genetica Polonica

|

1972

|

tom 13

|

nr 3

Ograniczanie wyników

5 Genetica Polonica

2 Journal of Applied Genetics

7 Strzyzewska C.

1 Kazimierska E. M.

1 Kazimierski T.

2 1995

2 1984

1 1976

1 1974

1 1972

Spontaneous changes in the genome of the red clover ( Trifoloim Pratense L.) I. Trisomity

Spontaneous changes in genome of red clover ( Trifolium pratense L.) II. Tetrasomity. morphological characters and fertility

Sib-mating in Trifolium pratense L. I Some morphological traits; properties of euploids, aneuploids and polyploids

Sib-mating in Trifolium pratense L. II. Cytogenetic of euploids, aneuploids and polyploids

Hybrids of Trifolium pratense L. [2n - 14 plus 2] with T. diffusum Ehrh. [2n - 16] and other 16-chromosome Trifolium species

Amphidiploid hybrids of Trifolium pratense L. [2n=14 and 2] with T.diffusum Ehrh. [2n=16]

Species crossing in the genus trifolium L.