article · Nature
This research constructed a comprehensive evolutionary tree for almost 8,000 angiosperm genera, representing 60% of all known genera. Using a standardised set of 353 nuclear genes and scaling with 200 fossils, it significantly expanded previous genomic sampling by 15-fold. The study confirmed many established relationships but also revised others, particularly within the rosid group. Findings indicate that early angiosperm evolution was marked by high gene tree conflict and explosive diversification, giving rise to over 80% of extant orders. Diversification rates remained steady through the remaining Mesozoic Era before resurging in the Cenozoic Era, linked to decreasing global temperatures and gene tree conflict. This work provides a deep and complex understanding of angiosperm evolution.
Angiosperms are fundamental to terrestrial ecosystems and human well-being. This research provides a much more detailed and robust understanding of their evolutionary history, explaining how they achieved their ecological dominance. This foundational knowledge is crucial for various biological studies.
The abstract focuses on fundamental research into plant evolution and does not indicate any direct application pathways, specific user groups, or a readiness level for commercialisation.
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Angiosperms are the cornerstone of most terrestrial ecosystems and human livelihoods<sup>1,2</sup>. A robust understanding of angiosperm evolution is required to explain their rise to ecological dominance. So far, the angiosperm tree of life has been determined primarily by means of analyses of the plastid genome<sup>3,4</sup>. Many studies have drawn on this foundational work, such as classification and first insights into angiosperm diversification since their Mesozoic origins<sup>5-7</sup>. However, the limited and biased sampling of both taxa and genomes undermines confidence in the tree and its implications. Here, we build the tree of life for almost 8,000 (about 60%) angiosperm genera using a standardized set of 353 nuclear genes<sup>8</sup>. This 15-fold increase in genus-level sampling relative to comparable nuclear studies<sup>9</sup> provides a critical test of earlier results and brings notable change to key groups, especially in rosids, while substantiating many previously predicted relationships. Scaling this tree to time using 200 fossils, we discovered that early angiosperm evolution was characterized by high gene tree conflict and explosive diversification, giving rise to more than 80% of extant angiosperm orders. Steady diversification ensued through the remaining Mesozoic Era until rates resurged in the Cenozoic Era, concurrent with decreasing global temperatures and tightly linked with gene tree conflict. Taken together, our extensive sampling combined with advanced phylogenomic methods shows the deep history and full complexity in the evolution of a megadiverse clade.
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DOI: 10.1038/s41586-024-07324-0
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