Correct rooting of the angiosperm radiation is both challenging and necessary for understanding the origins and evolution of physiological and phenotypic traits in flowering plants. The problem is known to be difficult due to the large genetic distance separating flowering plants from other seed plants and the sparse taxon sampling among basal angiosperms. Here, we provide further evidence for concern over substitution model misspecification in analyses of chloroplast DNA sequences. We show that support for Amborella as the sole representative of the most basal angiosperm lineage is founded on sequence site patterns poorly described by time-reversible substitution models. Improving the fit between sequence data and substitution model identifies Trithuria, Nymphaeaceae, and Amborella as surviving relatives of the most basal lineage of flowering plants. This finding indicates that aquatic and herbaceous species dominate the earliest extant lineage of flowering plants.

Goremykin, V.; Nikiforova, S.; Biggs, P.J.; Zhong, B.; Delange, P.; Martin, W.; Woetzel, S.; Atherton, R.A.; Mclenachan, P.A.; Lockhart, P.J. (2013). The evolutionary root of flowering plants. SYSTEMATIC BIOLOGY, 62 (1): 50-61. doi: 10.1093/sysbio/sys070 handle: http://hdl.handle.net/10449/32250

The evolutionary root of flowering plants

Goremykin, Vadim;Nikiforova, Svetlana;
2013-01-01

Abstract

Correct rooting of the angiosperm radiation is both challenging and necessary for understanding the origins and evolution of physiological and phenotypic traits in flowering plants. The problem is known to be difficult due to the large genetic distance separating flowering plants from other seed plants and the sparse taxon sampling among basal angiosperms. Here, we provide further evidence for concern over substitution model misspecification in analyses of chloroplast DNA sequences. We show that support for Amborella as the sole representative of the most basal angiosperm lineage is founded on sequence site patterns poorly described by time-reversible substitution models. Improving the fit between sequence data and substitution model identifies Trithuria, Nymphaeaceae, and Amborella as surviving relatives of the most basal lineage of flowering plants. This finding indicates that aquatic and herbaceous species dominate the earliest extant lineage of flowering plants.
Trithuria inconspicua
Chloroplast genomes
Angiosperm origins
Heterotachy
Base compositional heterogeneity
Data model fit
Settore AGR/07 - GENETICA AGRARIA
2013
Goremykin, V.; Nikiforova, S.; Biggs, P.J.; Zhong, B.; Delange, P.; Martin, W.; Woetzel, S.; Atherton, R.A.; Mclenachan, P.A.; Lockhart, P.J. (2013). The evolutionary root of flowering plants. SYSTEMATIC BIOLOGY, 62 (1): 50-61. doi: 10.1093/sysbio/sys070 handle: http://hdl.handle.net/10449/32250
File in questo prodotto:
File Dimensione Formato  
Syst_Biol-2013-Goremykin-50-61.pdf

accesso aperto

Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 1.25 MB
Formato Adobe PDF
1.25 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10449/32250
Citazioni
  • ???jsp.display-item.citation.pmc??? 25
  • Scopus 67
  • ???jsp.display-item.citation.isi??? 65
social impact