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Dependence of callus regeneration potency on the structure and presence of the suspensor of lettuce parthenogenetic proembryos cultured in vitro

100%
Piosik L., Zenkteler M., Zenkteler E.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
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2015
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tom 96
|
nr 1
2

Endoreduplication in the suspensor of Gagea lutea [L.] Ker Gawl. [Liliaceae]

84%
Kozieradzka-Kiszkurno M., Swierczynska J., Bohdanowicz J.
Acta Biologica Cracoviensia. Series Botanica
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2007
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tom 49
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nr 1
33-37
Karyological processes of differentiation of the suspensor of Gagea lutea (L.) Ker Gawl. were compared with the development of the embryo proper. The zygote divides into the smaller apical cell and the bigger basal cell, which becomes the basal cell of the suspensor. The mature suspensor consists of a huge basal cell and a few chalazal cells. The nuclear DNA content of the suspensor basal cell attains a high degree of ploidy, up to 128C. Nuclei with the highest ploidy level of 128C were found only in fully differentiated basal cells of more than 20-celled embryos. During polyploidization, the volume of the nuclei increased, and changes in the chromatin structure of polyploid nuclei were noted. With increasing levels of ploidy, polytene chromosomes were observed in the suspensor nucleus. Changes in DNA content, nucleus size and chromatin structure point to endoreduplication as the mechanism of polyploidization of the suspensor in Gagea lutea.
3

The embryo-suspensor in Sedum atratum L. (Crassulaceae): A developmental study using light and electron microscopy

84%
Czaplejewicz D., Kozieradzka-Kiszkurno M.
Acta Biologica Cracoviensia. Series Botanica. Supplement
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2014
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tom 56
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nr 1
4

Polyploidization in the suspensor of Triglochin palustre l. [Juncaginaceae]

84%
Kozieradzka-Kiszkurno M., Swierczynska J., Bohdanowicz J.
Acta Biologica Cracoviensia. Series Botanica
|
2002
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tom 44
Differentiation of the suspensor basal cell was studied in Triglochin palustre (2n = 24). The zygote divides into the smaller apical cell and the bigger basal cell, which becomes the basal cell of the suspensor. The nuclear DNA content of the suspensor basal cell attains a high degree of ploidy, up to 256C. Nuclei with the highest ploidy levels of 128C and 256C were observed in mature basal cells (from 50- to 500-celled embryos). As a result of polyploidization the volume of the nucleus increased and changes in the chromatin structure of polyploid nuclei were noted. Endochromocenters at middle ploidy level and bundle-like aggregations of chromatin at the highest ploidy levels were found. Rhythmic enlargement of the DNA content and nuclear volume of the basal cell, as well as the characteristic structure of its chromatin, point to endoreduplication as the mechanism of polyploidization in the suspensor.
5

Sedum acre embryogenesis: polyploidization in the suspensor

84%
Kozieradzka-Kiszkurno M., Bohdanowicz J.
Acta Biologica Cracoviensia. Series Botanica
|
2003
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tom 45
|
nr 2
Cytological processes of differentiation in the embryo suspensor of Sedum acre L. were compared with the development of the embryo proper. The zygote undergoes an asymmetric division to produce an apical cell and a basal cell, which becomes the basal cell of the suspensor. The mature differentiated suspensor consists of a large haustorial basal cell and 3-4 chalazal cells. The basal cell nucleus gradually grows to a considerable size, and the amount of nuclear DNA also increases. The highest degree of ploidy (1024C) was observed in basal cells in large >100-celled embryos. Chromocenters at low (8C-16C) and middle (32C-64C) levels of ploidy, and endochromocenters at higher (128C-256C) and the highest (512C-1024C) levels of ploidy were observed. Changes in DNA content, nucleus size and chromatin structure point to endoreduplication as the mechanism of polyploidization of the suspensor in Sedum acre.
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