Karyotype constancy and genome size variation in BulgarianCrepis foetida s. l. (Asteraceae) |
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Authors: | Dessislava Dimitrova Irma Ebert Johann Greilhuber Stefan Kozhuharov |
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Institution: | (1) Institute of Botany, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 23, 1113 Sofia, Bulgaria;(2) Institute of Botany of the University of Vienna, Rennweg 14, A-1030 Vienna, Austria |
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Abstract: | Ten populations ofCrepis foetida from Bulgaria belonging to the three subspeciesfoetida, rhoeadifolia, andcommutata were analyzed karyologically using haematoxylin staining, Giemsa C-banding, fluorochrome banding, Ag-NOR staining, Feulgen cytophotometry (scanning densitometry and video-based image analysis), and propidium iodide flow cytometry. The quantitatively-evaluated karyotype structure was similar among all populations, with minor variation in a few intercalary sites only and in the amount of NOR-associated heterochromatin (satellites). In contrast to the karyotypic constancy the genome size ofC. foetida subsp.commutata was about 10% lower than those of the other two subspecies, which had similar genome sizes. The genome size measurements using three different methods resulted in highly correlated data. The genome size difference adds some weight to previous taxonomic opinions treatingC. foetida subsp.commutata at species level, asC. commutata.
Prof. Dr. Stefan Kozhuharov (4 January 1933–24 August 1997). |
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Keywords: | Asteraceae Crepis foetida Subspecies idiograms haematoxylin staining Giemsa C-banding fluorochrome banding Ag-NOR staining genome size Feulgen densitometry propidium iodide flow cytometry |
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