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Title: Descending dysploidy and bidirectional changes in genome size accompanied Crepis (Asteraceae) evolution
Authors: Senderowicz, Magdalena
Nowak, Teresa
Rojek-Jelonek, Magdalena
Bisaga, Maciej
Papp, Laszlo
Weiss-Schneeweiss, Hanna
Kolano, Bożena
Keywords: chromosome number; karyotype formula; flow cytometry; genome size; phylogenetic analysis
Issue Date: 2021
Citation: "Genes" (2021), iss. 9, art. no. 1436, s. 1-24
Abstract: The evolution of the karyotype and genome size was examined in species of Crepis sensu lato. The phylogenetic relationships, inferred from the plastid and nrITS DNA sequences, were used as a framework to infer the patterns of karyotype evolution. Five different base chromosome numbers (x = 3, 4, 5, 6, and 11) were observed. A phylogenetic analysis of the evolution of the chromosome numbers allowed the inference of x = 6 as the ancestral state and the descending dysploidy as the major direction of the chromosome base number evolution. The derived base chromosome numbers (x = 5, 4, and 3) were found to have originated independently and recurrently in the different lineages of the genus. A few independent events of increases in karyotype asymmetry were inferred to have accompanied the karyotype evolution in Crepis. The genome sizes of 33 Crepis species differed seven-fold and the ancestral genome size was reconstructed to be 1 C = 3.44 pg. Both decreases and increases in the genome size were inferred to have occurred within and between the lineages. The data suggest that, in addition to dysploidy, the amplification/elimination of various repetitive DNAs was likely involved in the genome and taxa differentiation in the genus.
DOI: 10.3390/genes12091436
ISSN: 2073-4425
Appears in Collections:Książki/rozdziały (WNP)

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