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Evolutionary Relationships through Genome Comparisons

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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...

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Related Experiment Video

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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity

Published on: March 13, 2014

Modeling compositional heterogeneity resolves deep phylogeny of flowering plants.

Yongli Wang¹, Yan-Da Li^2,3, Shuo Wang⁴

¹Biofuels Institute, School of Environmental and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.

Plant Diversity

|March 5, 2025

Summary

Flowering plants (angiosperms) show rapid ancient radiations. New phylogenomic analyses using advanced models resolve the deep relationships among major angiosperm lineages, clarifying their evolutionary history.

Keywords:

Angiosperms CAT model Ceratophyllales Methodological factors Phylogenomics Radiation

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Area of Science:

Evolutionary Biology
Plant Science
Genomics

Background:

Angiosperms are dominant terrestrial plants, but their rapid ancient radiations complicate phylogenetic resolution.
Previous phylogenomic studies with large datasets improved understanding but left deeper relationships, particularly among Mesangiospermae, contentious.

Purpose of the Study:

To resolve the contentious interrelationships among the five major lineages of Mesangiospermae using genome-scale data.
To evaluate the effectiveness of different phylogenetic models in resolving ancient rapid radiations.

Main Methods:

Phylogenomic analyses using genome-scale data from plastid, mitochondrial, and nuclear sources.
Application and comparison of site-heterogeneous models (e.g., CAT-GTR+G4, LG+C20+F+G) against site-homogeneous or partition models.
Bayesian cross-validation and approximate unbiased (AU) tests to assess model fit and tree robustness.

Main Results:

Plastid and mitochondrial genomes alone provided insufficient phylogenetic signal for deep phylogeny.
Site-heterogeneous models significantly outperformed simpler models in resolving relationships.
Ceratophyllales were robustly resolved as sister to monocots, with this clade sister to magnoliids, Chloranthales, and eudicots.

Conclusions:

The study successfully resolved the deeper phylogeny of angiosperms, clarifying the relationships among Mesangiospermae lineages.
Modeling compositional heterogeneity is crucial for accurately resolving rapid radiations in plant evolution.
This work provides a robust framework for understanding the evolutionary history of flowering plants.