Solanum pan-genetics reveals paralogues as contingencies in crop engineering

Summary

This pan-genomic study of the genus Solanum—spanning 22 species including 13 indigenous crops—demonstrates that gene duplication and paralogue diversification are major barriers to translating genotype-to-phenotype relationships across crop species. Through functional and quantitative genetic analysis of African eggplant cultivars, the authors show how the loss, duplication, pseudogenization and deletion of CLV3 paralogues over short evolutionary timescales created a fused allele controlling fruit size and organ number. The findings underscore that understanding paralogue contingencies is essential for rational crop improvement and for exchanging breeding knowledge between major and indigenous Solanum crops.

UK applicability

Whilst this study focuses on Solanum species cultivated primarily in tropical and sub-tropical regions (eggplant, potato), the methodological framework and principles of navigating paralogue diversity have potential application to UK-grown crops and breeding programmes. The emphasis on indigenous crop genetics and genotype-to-phenotype predictability may inform crop improvement strategies for underutilised species suited to UK growing conditions.

Key measures

Gene duplication trajectories across 22 Solanum species; sequence, expression and functional divergence of paralogues; fruit size and organ number phenotypes in eggplant; CLV3 allele structure and function

Outcomes reported

The study established a pan-genome of 22 Solanum species (including 13 indigenous crops) and characterised thousands of gene duplications within domestication gene families, demonstrating that paralogue diversification creates obstacles to predictable genotype-to-phenotype translation. Using African eggplant cultivars, quantitative genetics and genome editing, the authors dissected the evolutionary history of CLV3 paralogues affecting fruit size and organ number.

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