1995
DOI: 10.1002/j.1537-2197.1995.tb12641.x
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CYTOGENETIC STUDIES OF SOME HYPOCHOERIS SPECIES (COMPOSITAE) FROM BRAZIL

Abstract: Karyotypes of nine Brazilian taxa of genus Hypochoeris were studied utilizing root‐tip mitotic metaphases. Two distinct groups were found. One group includes six species that showed high asymmetric bimodal karyotypes, while the second group has two species that have a karyotype similar to those observed in European species. All the species have karyotypes with 2n = 8 that are very uniform within each group, with only small morphological differences. Nucleolar organizing region and C‐band patterns are shown for… Show more

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Cited by 13 publications
(22 citation statements)
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“…*Secondary constriction on the short arm of chromosome pair 3. H. catharinensis shares the basic chromosome number x = 4, with the asymmetrical and bimodal karyotypes that characterize the South American species of Hypochaeris (Ruas et al, 1995(Ruas et al, , 2005Weiss-Schneeweiss et al, 2007, 2008. The typical metaphase and ideogram of H. catharinensis are illustrated in Figure 1A and D. Comparative analysis among karyotypes from all populations revealed the absence of significant differences, with only small variations in the absolute size between corresponding chromosome pairs (data not shown), as denoted by the data of the relative length ( Table 2).…”
Section: Resultsmentioning
confidence: 99%
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“…*Secondary constriction on the short arm of chromosome pair 3. H. catharinensis shares the basic chromosome number x = 4, with the asymmetrical and bimodal karyotypes that characterize the South American species of Hypochaeris (Ruas et al, 1995(Ruas et al, , 2005Weiss-Schneeweiss et al, 2007, 2008. The typical metaphase and ideogram of H. catharinensis are illustrated in Figure 1A and D. Comparative analysis among karyotypes from all populations revealed the absence of significant differences, with only small variations in the absolute size between corresponding chromosome pairs (data not shown), as denoted by the data of the relative length ( Table 2).…”
Section: Resultsmentioning
confidence: 99%
“…Differences in basic chromosome numbers (x = 3, 4, 5, and 6) and symmetric karyotypes are typically found in Old World species (Parker, 1976;Mugnier and Siljak-Yakovlev, 1988;Barghi et al, 1989;Siljak-Yakovlev et al, 1994;Hall and Parker, 1995;Cerbah et al, 1998). In contrast, the South American species exhibit a uniform basic chromosome number with x = 4, associated with a highly asymmetrical and bimodal karyotypes (Stebbins, 1971;Ruas et al, 1995Ruas et al, , 2005Weiss-Schneeweiss et al, 2003, 2008.…”
Section: Introductionmentioning
confidence: 99%
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“…Chromosome observed by 400x and 1000x magnification and photographed. Chromosomes characterized including chromosome numeration, p, q, absolute length, centromere index, RLK value, and R value (Ruas et al, 1995.;Levan et al, 1964;Brown, 1972).…”
Section: Methodsmentioning
confidence: 99%
“…Karyotype data for each taxon and population are reported in Table 1, along with karyotype information available from the literature (Barghi & al. 1989, Mugnier & Siljak-Yakovlev 1987, Ruas & al. 1995.…”
Section: A Cytological Survey Of North African Species Of Hypochaerismentioning
confidence: 99%