New chromosome numbers inTaraxacum with reference to SAT-chromosomes

Krahulcová, Anna

doi:10.1007/bf02853516

Cited by 4 publications

(2 citation statements)

References 8 publications

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“…In the literature, satellite chromosomes have been observed in some species (Erlandsson, 1939;Singh & al. 1974;Krahulcova, 1993;Sato & al. 2007;Grzesiuk & al.…”

Section: Resultsmentioning

confidence: 99%

Karyological study on 12 species of the genus Taraxacum (Asteraceae) grown in Turkey

2018

Fl. Medit.

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The somatic chromosomes and karyotypes of 12 Taraxacum species were determined. All studied species were collected from natural habitats in Marmara Region, NW Turkey. The chromosome numbers of Taraxacum aznavourii (2n = 24), T. gracilens (2n = 24), T. hyberniforme (2n = 32) and T. pseudobrachyglossum (2n = 24) are reported here for the first time. The basic chromosome number was found as x = 8 and all the examined taxa are triploid or tetraploid. All the examined species of the sections Erythrosperma and Palustria are triploids (2n = 3x = 24), while of the section Scariosa all are tetraploids (2n = 4x = 32), with the exception of T. minimum, which is both triploids and tetraploids. The detailed karyotype features of the 12 Taraxacum Taraxacum species are also presented.

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“…In the literature, satellite chromosomes have been observed in some species (Erlandsson, 1939;Singh & al. 1974;Krahulcova, 1993;Sato & al. 2007;Grzesiuk & al.…”

Section: Resultsmentioning

confidence: 99%

Karyological study on 12 species of the genus Taraxacum (Asteraceae) grown in Turkey

2018

Fl. Medit.

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“…Additional observations revealed a most inconsistent pattern of satellites and secondary constrictions in a single species, involving their number, size and chromosomal location, even within individuals ( Richards, 1989 ). The variation in these cytological rDNA markers did not appear to be associated with the geographic origin of the populations sampled or the taxonomic adscription of the species, and accordingly, a constant number of satellites was rarely recorded for any species ( Den Nijs et al, 1978 ; Krahulcová, 1993 ). It was suggested that such uncertainties regarding secondary constrictions might partially be explained by the experimental vagueness associated to the lack of strict uniformity of the pretreatment procedures ( Den Nijs et al, 1978 ).…”

Section: The Nuclear 35s Rdna Locusmentioning

confidence: 93%

The Nuclear 35S rDNA World in Plant Systematics and Evolution: A Primer of Cautions and Common Misconceptions in Cytogenetic Studies

2022

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The ubiquitous presence of rRNA genes in nuclear, plastid, and mitochondrial genomes has provided an opportunity to use genomic markers to infer patterns of molecular and organismic evolution as well as to assess systematic issues throughout the tree of life. The number, size, location, and activity of the 35S rDNA cistrons in plant karyotypes have been used as conventional cytogenetic landmarks. Their scrutiny has been useful to infer patterns of chromosomal evolution and the data have been used as a proxy for assessing species discrimination, population differentiation and evolutionary relationships. The correct interpretation of rDNA markers in plant taxonomy and evolution is not free of drawbacks given the complexities derived from the lability of the genetic architecture, the diverse patterns of molecular change, and the fate and evolutionary dynamics of the rDNA units in hybrids and polyploid species. In addition, the terminology used by independent authors is somewhat vague, which often complicates comparisons. To date, no efforts have been reported addressing the potential problems and limitations involved in generating, utilizing, and interpreting the data from the 35S rDNA in cytogenetics. This review discusses the main technical and conceptual limitations of these rDNA markers obtained by cytological and karyological experimental work, in order to clarify biological and evolutionary inferences postulated in a systematic and phylogenetic context. Also, we provide clarification for some ambiguity and misconceptions in terminology usually found in published work that may help to improve the usage of the 35S ribosomal world in plant evolution.

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Towards a better understanding of the Taraxacum evolution (Compositae–Cichorieae) on the basis of nrDNA of sexually reproducing species

et al. 2014

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New chromosome numbers inTaraxacum with reference to SAT-chromosomes

Cited by 4 publications

References 8 publications

Karyological study on 12 species of the genus Taraxacum (Asteraceae) grown in Turkey

Karyological study on 12 species of the genus Taraxacum (Asteraceae) grown in Turkey

The Nuclear 35S rDNA World in Plant Systematics and Evolution: A Primer of Cautions and Common Misconceptions in Cytogenetic Studies

Towards a better understanding of the Taraxacum evolution (Compositae–Cichorieae) on the basis of nrDNA of sexually reproducing species

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