2008
DOI: 10.1093/aob/mcn023
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Abstract: Early evolution of Hypochaeris in South America was characterized by considerable karyotype differentiation resulting from independent derivations from an ancestral karyotype. There was marked diversification with respect to the position and evolution of the 35S rDNA locus on chromosome 3, probably involving inversions and/or transpositions, and on chromosome 2 (rarely 3) concerning inactivation and loss. Among these different karyotype assemblages, the apargioides group and its derivatives constitute by far t… Show more

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Cited by 74 publications
(66 citation statements)
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“…Studies focused on rDNA localization have been used to propose a mode of chromosome evolution in South American species of Hypochaeris. As suggested by Ruas et al (2005) and Weiss-Schneeweiss et al (2007, 2008, structural rearrangements, including inversions and translocations, taking place in ancestral karyotypes bearing two or three 45S rDNA loci have given rise to derived karyotypes with a unique 45S rDNA locus. By interpreting the position of the rDNA in a phylogenetic context, Weiss-Schneeweiss et al (2008) distinguished 7 chromosome groups among the South American Hypochaeris.…”
Section: Resultsmentioning
confidence: 98%
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“…Studies focused on rDNA localization have been used to propose a mode of chromosome evolution in South American species of Hypochaeris. As suggested by Ruas et al (2005) and Weiss-Schneeweiss et al (2007, 2008, structural rearrangements, including inversions and translocations, taking place in ancestral karyotypes bearing two or three 45S rDNA loci have given rise to derived karyotypes with a unique 45S rDNA locus. By interpreting the position of the rDNA in a phylogenetic context, Weiss-Schneeweiss et al (2008) distinguished 7 chromosome groups among the South American Hypochaeris.…”
Section: Resultsmentioning
confidence: 98%
“…As suggested by Ruas et al (2005) and Weiss-Schneeweiss et al (2007, 2008, structural rearrangements, including inversions and translocations, taking place in ancestral karyotypes bearing two or three 45S rDNA loci have given rise to derived karyotypes with a unique 45S rDNA locus. By interpreting the position of the rDNA in a phylogenetic context, Weiss-Schneeweiss et al (2008) distinguished 7 chromosome groups among the South American Hypochaeris. The position of the 45S rDNA in H. catharinensis placed this species in the Patagonica group together with H. lutea and H. patagonica (Reck et al, 2011).…”
Section: Resultsmentioning
confidence: 98%
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