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Plant Systematics and Evolution

, Volume 298, Issue 8, pp 1503–1514 | Cite as

Molecular cytogenetic studies of the “Xanthocephalum group” (Asteraceae)

  • Natalia Cecilia Moreno
  • L. Stiefkens
  • M. L. Las Peñas
  • A. Bartoli
  • R. Tortosa
  • G. Bernardello
Original Article

Abstract

Fourteen North American members of the “Xanthocephalum group” were studied by classical and molecular cytogenetics. Location and number of rDNA sites were determined by FISH. For the 5S rDNA, a probe was obtained from Prionopsis ciliata. Most species were diploid (2n = 12), although Isocoma menziesii, Grindelia hirsutula, G. robusta, both varieties of G. stricta, and one population of G. camporum were tetraploid (2n = 24). Diploid Grindelia and Prionopsis ciliata were 5m + 1sm, tetraploids 10m + 2sm, except G. hirsutula (8m + 4sm), and Isocoma and Olivaea 6m + 2sm and 3m + 3sm, respectively. Most species had satellites on the short arms of m pairs: two in tetraploids and P. ciliata and one in diploids. Satellites were associated with two CMA+/DAPI bands in diploid species and four bands in tetraploids and in P. ciliata. rDNA loci (two in diploids to four in tetraploids) may be indicative of ploidy level. Grindelia tetraploids could have originated recently by autopolyploidy. Chromosome duplication was followed by modifications in the genome structure, resulting in higher heterochromatin amounts not associated with NORs. There is only one 5S site per basic genome in para or pericentromeric regions. Although not always large, chromosome variation has accompanied the evolutionary divergence of the taxa studied.

Keywords

18-5.8-26S and 5S rDNA Asteraceae Fluorescent banding Karyotypes North America Xanthocephalum group” 

Notes

Acknowledgments

Dr Carolyn Ferguson (KSU Herbarium), Biol. Abigail Moore (JEPS Herbarium), and Dr José Luis Villaseñor (Instituto de Biología, UNAM) kindly send the samples. Grants from “Consejo Nacional de Investigaciones Científicas y Técnicas” (CONICET, Argentina), FONCYT, and “Universidad Nacional de Córdoba” (SECyT, Argentina) are acknowledged.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Natalia Cecilia Moreno
    • 1
    • 3
  • L. Stiefkens
    • 1
  • M. L. Las Peñas
    • 1
    • 3
  • A. Bartoli
    • 2
  • R. Tortosa
    • 2
    • 3
  • G. Bernardello
    • 1
    • 3
  1. 1.Instituto Multidisciplinario de Biología Vegetal UNC-CONICETCórdobaArgentina
  2. 2.Facultad de AgronomíaUBABuenos AiresArgentina
  3. 3.Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Cdad. de Buenos AiresArgentina

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