Phylogenetic Analysis of Euphorbia Species

The genus Euphorbia, encompassing over 2 000 species, exhibits extraordinary morphological and ecological diversity, ranging from diminutive annual herbs to large succulents. Traditional taxonomy has been confounded by convergent traits and plastic morphological characters, prompting a shift towards molecular phylogenetics to infer evolutionary relationships. Contemporary approaches leverage entire chloroplast genomes, nuclear ribosomal markers and targeted gene regions to reconstruct robust phylogenies, resolve subgeneric relationships and delimit species. High‐throughput sequencing and advanced bioinformatic pipelines now permit rapid assembly of plastomes and fine‐scale analyses of sequence variation, facilitating the identification of informative molecular markers. Such studies have global significance for conservation prioritisation, bioprospecting of medicinal and industrial compounds, and for tracing biogeographical patterns across continents and islands. By integrating phylogenomic data with morphological and ecological evidence, researchers are refining the classification of Euphorbia, clarifying the monophyly of major lineages and uncovering cryptic diversity that may carry urgent conservation implications.

Research from Nature Portfolio

Comparative analyses of complete chloroplast genomes from multiple Euphorbia species have revealed a remarkably conserved quadripartite structure, with variation concentrated in non-coding regions and at inverted repeat/single-copy junctions. By calculating phylogenetic informativeness and nucleotide diversity across coding loci, the rpoB gene emerged as the most suitable marker for species delimitation and shallow phylogenetic inference within the genus. This work establishes a set of candidate loci for future multilocus studies and provides a refined framework for resolving relationships among closely related taxa, thereby addressing long-standing taxonomic ambiguities.

Phylogenetic Analysis of Euphorbia Species publication trend

The graph below shows the total number of articles in phylogenetic analysis of euphorbia species across all publications each year (not limited to Nature Index journals).

Technical terms

Chloroplast genome: The circular DNA molecule within a plant’s chloroplast, often used for phylogenetic reconstruction because of its moderate rate of evolution and conserved gene order.

Inverted repeat (IR): Two identical or nearly identical sequences in opposite orientation flanking the single-copy regions of a plastome, whose expansion or contraction can drive genome size variation.

Phylogenomic analysis: The inference of evolutionary relationships using genome-scale data, integrating multiple loci to increase resolution and support across the tree.

Monophyly: The condition in which a group of organisms includes an ancestor and all of its descendants, indicating a single evolutionary origin.

Molecular marker: A specific DNA sequence with sufficient polymorphism to distinguish among taxa or populations, used for phylogenetic or population genetic studies.

References

1. Characterization, comparison, and phylogenetic analyses of chloroplast genomes of Euphorbia species. Scientific Reports (2024).
2. Plastome Evolution in the Hyperdiverse Genus Euphorbia (Euphorbiaceae) Using Phylogenomic and Comparative Analyses: Large-Scale Expansion and Contraction of the Inverted Repeat Region. Frontiers in Plant Science (2021).
3. The complete chloroplast genome of Euphorbia prostrata (Euphorbiaceae). Mitochondrial DNA Part B (2024).