Phylotranscriptomic insights into a Mesoproterozoic–Neoproterozoic origin and early radiation of green seaweeds (Ulvophyceae)

Zheng Hou, Xiaoya Ma, Xuan Shi, Xi Li, Lingxiao Yang, Shuhai Xiao, Olivier Clerck, Frederik Leliaert and Bojian Zhong ()
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Zheng Hou: Nanjing Normal University
Xiaoya Ma: Nanjing Normal University
Xuan Shi: Nanjing Normal University
Xi Li: Nanjing Normal University
Lingxiao Yang: Nanjing Normal University
Shuhai Xiao: Virginia Tech
Olivier Clerck: Ghent University
Frederik Leliaert: Ghent University
Bojian Zhong: Nanjing Normal University

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract The Ulvophyceae, a major group of green algae, is of particular evolutionary interest because of its remarkable morphological and ecological diversity. Its phylogenetic relationships and diversification timeline, however, are still not fully resolved. In this study, using an extensive nuclear gene dataset, we apply coalescent- and concatenation-based approaches to reconstruct the phylogeny of the Ulvophyceae and to explore the sources of conflict in previous phylogenomic studies. The Ulvophyceae is recovered as a paraphyletic group, with the Bryopsidales being a sister group to the Chlorophyceae, and the remaining taxa forming a clade (Ulvophyceae sensu stricto). Molecular clock analyses with different calibration strategies emphasize the large impact of fossil calibrations, and indicate a Meso-Neoproterozoic origin of the Ulvophyceae (sensu stricto), earlier than previous estimates. The results imply that ulvophyceans may have had a profound influence on oceanic redox structures and global biogeochemical cycles at the Mesoproterozoic-Neoproterozoic transition.

Date: 2022
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DOI: 10.1038/s41467-022-29282-9

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