Wyniki wyszukiwania

1

Low temperature induces polyploidization in dividing Amoeba proteus

100%

Afon'kin S. Y., Kalinina L. V.

Acta Protozoologica

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1987

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tom 26

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nr 2

2

Genome size variation of Lotus peregrinus at evolution canyon I microsite, Lower Nahal Oren, Mt. Carmel, Israel

84%

Gasmanova N., Lebeda A., Dolezalova I., Cohen T., Pavlicek T., Fahima T., Nevo E.

Acta Biologica Cracoviensia. Series Botanica

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2007

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tom 49

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nr 1

39-46

On the basis of previous studies showing a positive correlation between number of copies of retrotransposons and geographical environment, we hypothesized that different ecogeographical conditions on opposite slopes of Evolution Canyon I could cause intraspecific variation in plant genome size. To test this hypothesis, we chose Lotus peregrinus L. (annual, self-pollinator) as the first candidate because of its biological contrast to the previously studied carob tree (long-lived, cross-pollinator). Absolute nuclear DNA content of 60 genotypes of L. peregrinus was estimated by PI flow cytometry, with tomato (Lycopersicon esculentum cv. Stupicke) as internal reference standard. The mean 2C-value in L. peregrinus was 2.546 pg, ranging from 2.39 pg to 2.71 pg. The mean 2C-value was higher in plants from the south-facing slope (2.549 pg) than from the north-facing slope (2.544 pg), but we were not able to show significant interslope differences in genome size.

3

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.

4

Relationships between Lupinus [Fabaceae] species as reflected by genome size variation

84%

Naganowska B., Wolko B., Sliwinska E., Kaczmarek Z.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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2005

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tom 72

5

Heterochromatin organization in metaphase chromosomes and interphase nuclei of Dasypyrum breviaristatum [Lindb f] Frederiksen

84%

Pignone D., Galasso I., Blanco A., Cremonini R.

Acta Societatis Botanicorum Poloniae

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2000

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tom 69

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nr 1

6

Flow cytometry – a modern method for exploring genome size and nuclear DNA synthesis in horticultural and medicinal plant species

67%

Sliwinska E.

Folia Horticulturae

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2018

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tom 30

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nr 1

7

High variability of nuclear DNA content in cultivars and natural populations of Poa pratensis L. in relation to morphological characters

67%

Murovec J., Kastelec D., Vilhar B., Cop J., Bohanec B.

Acta Biologica Cracoviensia. Series Botanica

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2009

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tom 51

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nr 2

45-52

Kentucky bluegrass is a facultative apomict which is propagated from seeds of variable genetic origins, ploidy levels and nuclear DNA contents. This study analyzes the variability of relative nuclear DNA content among cultivars and natural populations, and examines whether this variability is correlated with morphological traits. Relative nuclear DNA content (an indirect measure of chromosomal variability) was determined in 281 plants from 28 accessions (17 cultivars, 11 populations) using flow cytometry of DAPI-stained nuclei. The same plants were also measured for leaf area and stomatal length. Variation of measured relative DNA content between the studied accessions was very high (5.5-fold). Intra-accession variation was very high in six accessions, even though three of these were cultivars. Relative nuclear DNA content was correlated with stomatal length but not with leaf area. The lack of correlation with leaf area might explain why high intra-accession variability of nuclear DNA content was found in released cultivars that had passed uniformity testing during the registration procedure. We suggest that nuclear DNA content measurement should be made part of the cultivar registration process

Ograniczanie wyników

Low temperature induces polyploidization in dividing Amoeba proteus

Genome size variation of Lotus peregrinus at evolution canyon I microsite, Lower Nahal Oren, Mt. Carmel, Israel

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

Relationships between Lupinus [Fabaceae] species as reflected by genome size variation

Heterochromatin organization in metaphase chromosomes and interphase nuclei of Dasypyrum breviaristatum [Lindb f] Frederiksen

Flow cytometry – a modern method for exploring genome size and nuclear DNA synthesis in horticultural and medicinal plant species

High variability of nuclear DNA content in cultivars and natural populations of Poa pratensis L. in relation to morphological characters