Phylogenetic Analysis of Solanaceae Diversity

The Solanaceae, or nightshade family, encompasses over 3 000 species including key crops such as tomato, potato and pepper as well as a vast array of wild relatives. Phylogenetic analysis has become central to resolving evolutionary relationships, tracing lineage divergence and understanding the emergence of traits such as fruit morphology, alkaloid biosynthesis and polyploidy. Recent approaches employ both nuclear and plastid genomic sequences to reconstruct robust, time-calibrated trees, revealing that major clades within Solanaceae diverged during the Paleogene. High-throughput transcriptome sequencing and genome skimming have greatly increased gene sampling density, improving support for deep and shallow nodes. The integration of fossil calibrations with relaxed molecular-clock models has refined estimates of divergence timing, allowing correlation with historical climatic and geological events. Studies of allopolyploid sections illustrate how hybridisation and genome duplication have fostered rapid radiations, especially in arid regions. Comparative analyses of chloroplast genome structure have aided species delimitation and highlighted hotspots of structural variation. Together, these phylogenetic frameworks illuminate the tempo and mode of Solanaceae diversification, inform conservation priorities for wild lineages, and underpin breeding strategies by clarifying gene flow and trait evolution across the family.

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Phylogenetic Analysis of Solanaceae Diversity publication trend

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

Technical terms

Phylogeny: The evolutionary history and relationships among species or groups, typically depicted as a branching tree.

Clade: A group of organisms that includes an ancestor and all its descendants, representing a single branch on the tree of life.

Molecular clock: A method that uses the rate of genetic mutation to estimate the timing of evolutionary divergences.

Transcriptome: The complete set of RNA transcripts produced by the genome under specific conditions, used to infer gene sequences and expression.

Plastome: The genome of a plastid (e.g. chloroplast), often analysed for phylogenetic inference due to its conserved structure and gene content.

Allopolyploidy: The condition in which a species contains two or more sets of chromosomes derived from distinct ancestral species via hybridisation.

Bootstrap support: A statistical measure indicating the reliability of inferred branches in a phylogenetic tree based on resampling of the data.

Monophyletic: Describing a group of organisms that form a clade, including an ancestor and all of its descendants without exclusions.

References

1. A highly resolved nuclear phylogeny uncovers strong phylogenetic conservatism and correlated evolution of fruit color and size in Solanum L.. New Phytologist (2024).
2. Polyploid Nicotiana section Suaveolentes originated by hybridization of two ancestral Nicotiana clades. Frontiers in Plant Science (2023).
3. Complete chloroplast genomes of four Physalis species (Solanaceae): lights into genome structure, comparative analysis, and phylogenetic relationships. BMC Plant Biology (2020).