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Burchardt P, Souza-Chies TT, Chauveau O, et al. Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae). Genet Mol Biol. 2018;41(1):288-307doi: 10.1590/1678-4685-GMB-2017-0077.
Burchardt, P., Souza-Chies, T. T., Chauveau, O., Callegari-Jacques, S. M., Brisolara-Corrêa, L., Inácio, C. D., Eggers, L., Siljak-Yakovlev, S., de Campos, J. M. S., & Kaltchuk-Santos, E. (2018). Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae). Genetics and molecular biology, 41(1), 288-307. https://doi.org/10.1590/1678-4685-GMB-2017-0077
Burchardt, Paula, et al. "Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae)." Genetics and molecular biology vol. 41,1 (2018): 288-307. doi: https://doi.org/10.1590/1678-4685-GMB-2017-0077
Burchardt P, Souza-Chies TT, Chauveau O, Callegari-Jacques SM, Brisolara-Corrêa L, Inácio CD, Eggers L, Siljak-Yakovlev S, de Campos JMS, Kaltchuk-Santos E. Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae). Genet Mol Biol. 2018;41(1):288-307. doi: 10.1590/1678-4685-GMB-2017-0077. Epub 2018 Mar 01. PMID: 29505063; PMCID: PMC5913718.
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Genet Mol Biol. 2018;41(1):288-307. doi: 10.1590/1678-4685-GMB-2017-0077. Epub 2018 Mar 01.

Cytological and genome size data analyzed in a phylogenetic frame: Evolutionary implications concerning Sisyrinchium taxa (Iridaceae: Iridoideae).

Genetics and molecular biology

Paula Burchardt, Tatiana T Souza-Chies, Olivier Chauveau, Sidia M Callegari-Jacques, Lauís Brisolara-Corrêa, Camila Dellanhese Inácio, Lilian Eggers, Sonja Siljak-Yakovlev, José Marcello Salabert de Campos, Eliane Kaltchuk-Santos

Affiliations

  1. Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
  2. Departamento de Botânica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
  3. Programa de Pós-Graduação em Botânica, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
  4. Departamento de Estatística, Instituto de Matemática e Estatística, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
  5. Ecologie Systématique Evolution, Université Paris-Sud, CNRS, AgroParisTech, Orsay, France.
  6. Departamento de Biologia, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brazil.
  7. Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.

PMID: 29505063 PMCID: PMC5913718 DOI: 10.1590/1678-4685-GMB-2017-0077

Abstract

Sisyrinchium is the largest genus of Iridaceae in the Americas and has the greatest amount of cytological data available. This study aimed at investigating how genomes evolved in this genus. Chromosome number, genome size and altitude from species of sect. Viperella were analyzed in a phylogenetic context. Meiotic and pollen analyses were performed to assess reproductive success of natural populations, especially from those polyploid taxa. Character optimizations revealed that the common ancestor of sect. Viperella was probably diploid (2n = 2x =18) with two subsequent polyplodization events. Total DNA content (2C) varied considerably across the phylogeny with larger genomes detected mainly in polyploid species. Altitude also varied across the phylogeny, however no significant relationship was found between DNA content changes and altitude in our data set. All taxa presented regular meiosis and pollen viability (> 87%), except for S. sp. nov. aff. alatum (22.70%), suggesting a recent hybrid origin. Chromosome number is mostly constant within this section and polyploidy is the only source of modification. Although 2C varied considerably among the 20 taxa investigated, the diversity observed cannot be attributed only to polyploidy events because large variations of DNA content were also observed among diploids.

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