Phylogenetic Analysis of Gymnosperm Evolution

Gymnosperms, one of the major lineages of extant seed plants, encompass conifers, cycads, Ginkgo and gnetophytes. Recent decades have seen the integration of diverse data streams—morphological characters, fossil evidence and genomic sequences—into comprehensive phylogenetic frameworks. Molecular phylogenetics has clarified deep relationships, confirming the monophyly of gymnosperms and revealing cycads plus Ginkgo as sister to other extant lineages. Yet the placement of gnetophytes remains contentious, with analyses alternately aligning them with conifers or as a distinct sister group. Advances in genome and transcriptome sequencing have yielded hundreds to thousands of single-copy nuclear genes, providing robust markers for resolving both shallow and ancient divergences. Simultaneously, improved methods for coalescent analysis and concatenated data sets now better account for gene tree discordance, rate heterogeneity and missing data. Fossil calibration of molecular clocks has refined divergence time estimates, situating the crown radiation of many gymnosperm clades in the late Palaeozoic to Mesozoic eras. Integration of palaeobotanical discoveries, including early ovule morphology and Mesozoic reproductive structures, has placed key morphological innovations in temporal context, shedding light on the origins of wind-dispersal mechanisms and sexual fluids. This synthesis of molecular, morphological and fossil data underpins ongoing efforts to understand gymnosperm diversification, genome evolution—including rare whole-genome duplications—and ecological adaptation, with implications for biodiversity conservation and the role of these long-lived plants in carbon sequestration and forest dynamics.

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Phylogenetic Analysis of Gymnosperm Evolution publication trend

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

Technical terms

Gymnosperm: A seed plant that bears ovules exposed on cones or scales rather than enclosed in an ovary.

Phylogenomics: Reconstruction of evolutionary relationships using genome-scale data sets to integrate multiple genes or entire genomes.

Molecular marker: A discrete DNA sequence utilised to detect genetic variation and infer phylogenetic relationships among taxa.

Coalescent analysis: A statistical framework for modelling the genealogical history of alleles to infer species divergence and account for gene tree discordance.

Fossil calibration: The use of dated fossil evidence to constrain the ages of nodes in a molecular phylogenetic tree, anchoring divergence time estimates to absolute geological ages.

References

1. Arlenea delicata gen. et sp. nov., a new ephedroid plant from the Early Cretaceous Crato Formation, Araripe Basin, Northeast Brazil. Plant Diversity (2023).
2. A New Gnetalean Macrofossil from the Mid-Jurassic Daohugou Formation. Plants (2023).
3. Single-Copy Genes as Molecular Markers for Phylogenomic Studies in Seed Plants. Genome Biology and Evolution (2017).
4. Phylogenomics and Coalescent Analyses Resolve Extant Seed Plant Relationships. PLOS ONE (2013).
5. Evidence for an ancient whole genome duplication in the cycad lineage. PLOS ONE (2017).
6. The Evolution of Sexual Fluids in Gymnosperms From Pollination Drops to Nectar. Frontiers in Plant Science (2018).