Evolutionary site-number changes of ribosomal DNA loci during speciation: complex scenarios of ancestral and more recent polyploid events

  1. Rosato, Marcela 1
  2. Moreno-Saiz, Juan C. 3
  3. Galián, José A. 1
  4. Rosselló, Josep A. 12
  1. 1 Jardín Botánico, ICBiBE-Unidad Asociada CSIC, Universidad de Valencia, c/Quart 80, E-46008 Valencia, Spain
  2. 2 Carl Faust Fdn., PO Box 112, E-17300 Blanes, Spain
  3. 3 Departamento de Biologóa, Facultad de Ciencias, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
Zugehörigkeit anzeigen +
Zeitschrift:
AoB Plants

ISSN: 2041-2851

Datum der Publikation: 2015

Ausgabe: 7

Seiten: plv135

Art: Artikel

DOI: 10.1093/AOBPLA/PLV135 GOOGLE SCHOLAR lock_openOpen Access editor

Andere Publikationen in: AoB Plants

Ziele für nachhaltige Entwicklung

Zusammenfassung

Several genome duplications have been identified in the evolution of seed plants, providing unique systems for studying karyological processes promoting diversification and speciation. Knowledge about the number of ribosomal DNA (rDNA) loci, together with their chromosomal distribution and structure, provides clues about organismal and molecular evolution at various phylogenetic levels. In this work, we aim to elucidate the evolutionary dynamics of karyological and rDNA site-number variation in all known taxa of subtribe Vellinae, showing a complex scenario of ancestral and more recent polyploid events. Specifically, we aim to infer the ancestral chromosome numbers and patterns of chromosome number variation, assess patterns of variation of both 45S and 5S rDNA families, trends in site-numberchange of rDNA loci within homoploid and polyploid series, and reconstruct the evolutionary history of rDNA site number using a phylogenetic hypothesis as a framework. The best-fitting model of chromosome number evolution with a high likelihood score suggests that the Vellinae core showing x ¼ 17 chromosomes arose by duplication events from a recent x ¼ 8 ancestor. Our survey suggests more complex patterns of polyploid evolution than previously noted for Vellinae.High polyploidization events (6x, 8x) arose independently in the basal clade Vella castrilensis–V. lucentina, where extant diploid species are unknown. Reconstruction of ancestral rDNA states in Vellinae supports the inference that the ancestral number of loci in the subtribe was two for each multigene family, suggesting that an overall tendency towards a net loss of 5S rDNA loci occurred during the splitting of Vellinae ancestors from the remaining Brassiceae lineages. A contrasting pattern for rDNA site change in both paleopolyploid and neopolyploid species was linked to diversification of Vellinae lineages. This suggests dynamic and independent changes in rDNA site number during speciation processes and a significant lack of correlation between 45S and 5S rDNA evolutionary pathways.

€ Finanzierung ansehen

Informationen zur Finanzierung

Geldgeber

  • Spanish Ministry of Education and Science
    • CGL2010-22347-C02-01
  • Catalan Government
    • 2009SGR608
  • Spanish Ministry of Education and Science

Bibliographische Referenzen

  • Ali, (2005), Genome, 48, pp. 341, 10.1139/g04-116
  • 10.1007/s00606-006-0415-z
  • 10.1126/science.1241089
  • Anderson, (1999), Plant Systematics and Evolution, 215, pp. 255, 10.1007/BF00984659
  • 10.1073/pnas.0909766107
  • 10.1038/nature01521
  • Crespo, (1992), Botanical Journal of the Linnean Society, 109, pp. 369, 10.1111/j.1095-8339.1992.tb00279.x
  • 10.1006/anbo.2000.1157
  • Crespo, (2005), Botanical Journal of the Linnean Society, 149, pp. 121, 10.1111/j.1095-8339.2005.00427.x
  • Domínguez Lozano, (2003), Atlas y libro rojo de la flora vascular amenazada de España, pp. 872
  • Fernández-Palacios, (2006), Botanica Macaronesica, 26, pp. 19
  • 10.1016/j.tplants.2010.11.005
  • 10.1016/S0378-1119(03)00629-2
  • 10.1007/s00412-012-0368-7
  • 10.1093/nar/7.7.1869
  • 10.1093/nar/8.21.4851
  • Gómez-Campo, (1981), Botanical Journal of the Linnean Society, 82, pp. 165, 10.1111/j.1095-8339.1981.tb00957.x
  • 10.1007/s001220100653
  • 10.1093/aob/mcj031
  • 10.1016/0378-1119(88)90591-4
  • 10.1038/nature09916
  • 10.1002/bies.20723
  • Lysak, (2011), Genetics and genomics of the Brassicaceae, pp. 1, 10.1007/978-1-4419-7118-0_1
  • 10.1101/gr.3531105
  • 10.1073/pnas.0510791103
  • 10.1104/pp.107.104380
  • Maddison, (1992), MacClade, analysis of phylogeny and character evolution
  • Maddison, (2009), Mesquite: a modular system for evolutionary analysis
  • Maire, (1967), Flore de l’ Afrique du Nord, Vol. XIII
  • 10.1105/tpc.108.062166
  • Manton, (1932), Annals of Botany, 46, pp. 509, 10.1093/oxfordjournals.aob.a090334
  • 10.1093/sysbio/syp083
  • 10.1007/s00122-005-0196-8
  • 10.1093/aob/mcl013
  • Pérez-Collazos, (2011), Biología de la conservación de Vella pseudocytisus subespecie paui, una planta amenazada de Aragón, pp. 163
  • 10.1007/s12224-009-9048-7
  • 10.1093/aob/mcn055
  • 10.1016/j.tplants.2006.09.002
  • 10.1146/annurev.cb.11.110195.000521
  • Simón-Porcar, (2015), Turkish Journal of Botany, 39, pp. 472, 10.3906/bot-1406-87
  • 10.1093/molbev/msr121
  • 10.1105/tpc.106.041665
  • 10.2307/3392030
  • 10.1007/s00606-006-0421-1
  • 10.1139/b05-021
  • 10.1007/s00606-010-0271-8
  • 10.1093/jhered/92.4.371
  • 10.1111/j.1365-313X.2006.02762.x
  • Zozomová-Lihová, (2014), New Phytologist, 203, pp. 1096, 10.1111/nph.12873