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Whole-mount Clearing and Staining of Arabidopsis Flower Organs and Siliques
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Published on: April 12, 2018

The evolutionary root of flowering plants.

Vadim V Goremykin1, Svetlana V Nikiforova, Patrick J Biggs

  • 1IASMA Research Center, Via E. Mach 1, 38010 San Michele all'Adige (TN), Italy. Vadim.Goremykin@iasma.it

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Understanding flowering plant origins is crucial. New analysis suggests aquatic and herbaceous plants like Trithuria, Nymphaeaceae, and Amborella represent the earliest angiosperm lineage, challenging previous models.

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Area of Science:

  • Evolutionary biology
  • Plant systematics
  • Molecular evolution

Background:

  • Determining the correct evolutionary rooting of angiosperms is essential for understanding trait evolution.
  • Phylogenetic analyses are complicated by genetic distance and limited sampling of early flowering plants.
  • Substitution model misspecification in chloroplast DNA analyses can lead to inaccurate evolutionary conclusions.

Purpose of the Study:

  • To investigate the impact of substitution model choice on angiosperm phylogeny.
  • To re-evaluate the position of Amborella within the angiosperm evolutionary tree.
  • To identify the earliest surviving lineage of flowering plants.

Main Methods:

  • Analysis of chloroplast DNA sequences using various substitution models.
  • Assessment of sequence site patterns and model fit.
  • Phylogenetic reconstruction incorporating improved model parameters.

Main Results:

  • Support for Amborella as the sole basal angiosperm is weakened by models that better fit sequence data.
  • Improved substitution models identify Trithuria, Nymphaeaceae, and Amborella as co-representatives of the earliest angiosperm lineage.
  • The earliest angiosperm lineage appears to be dominated by aquatic and herbaceous species.

Conclusions:

  • Substitution model choice significantly impacts the inferred phylogeny of early angiosperms.
  • The earliest diverging flowering plants likely include a mix of aquatic and herbaceous taxa.
  • Revising phylogenetic methods is key to accurately reconstructing plant evolutionary history.