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Phylogenomic analysis restructures the ulvophyceae.

Øyvind Saetren Gulbrandsen1,2, Ina Jungersen Andresen1, Anders Kristian Krabberød1

  • 1Section for Genetics and Evolutionary Biology (EVOGENE), Department of Biosciences, University of Oslo, Kristine Bonnevies Hus, Blindernveien 31, 0316, Oslo, Norway.

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|March 15, 2021
PubMed
Summary

This study redefines the evolutionary relationships within green algae (Chlorophyta), particularly the Ulvophyceae. Dasycladales are now grouped with Scotinosphaerales and Oltmannsiellopsidales, challenging previous classifications.

Keywords:
AcetabulariaBryopsidalesChlorophytaDasycladalesScotinosphaeralesUlvophyceaecytomorphologyevolutiongreen algaephylogenytranscriptomics

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Area of Science:

  • Phycology
  • Evolutionary Biology
  • Genomics

Background:

  • The evolutionary history of green algae (Chlorophyta), especially the Ulvophyceae, remains incompletely understood.
  • Previous studies have proposed differing phylogenetic placements for key orders like Dasycladales.

Purpose of the Study:

  • To reconstruct the evolutionary history of Ulvophyceae using new transcriptome data and phylogenomic analysis.
  • To clarify the phylogenetic position of Dasycladales within the green algae.

Main Methods:

  • Transcriptome sequencing of seven Dasycladales species.
  • Phylogenomic analysis of Chlorophyta, focusing on Ulvophyceae.
  • Application of both homogeneous and heterogeneous evolutionary models.

Main Results:

  • Dasycladales are identified as closely related to Scotinosphaerales and Oltmannsiellopsidales, restructuring the Ulvophyceae.
  • Cladophorales and Trentepohliales are found to be sister to the rest of the Ulvophyceae, contrary to prior research.
  • A sister relationship between Bryopsidales and Chlorophyceae is consistently supported.

Conclusions:

  • The study provides a revised phylogenetic framework for Ulvophyceae evolution.
  • Findings offer new insights into the evolution of cellular morphologies within this algal group.