Increasing plant group productivity through latent genetic variation for cooperation

Summary

This study develops a game-theoretical method to identify hidden genetic variation for cooperative traits—characteristics that benefit group productivity but disadvantage individual plants in competition. Using Arabidopsis as a model organism, the authors discovered a major locus where a rare allele promoted cooperation in high-density stands whilst also conferring pleiotropic benefits including reduced root competition and improved disease resistance. The findings suggest that conflicting selective pressures on pleiotropic genes may explain why cooperative alleles persist in natural populations, and that such variation could be rapidly deployed in crop breeding programmes to increase yields in monocultures.

UK applicability

The methodology and genetic insights from this model-organism study are potentially applicable to UK cereal breeding, where high-density stands are standard practice. However, translation would require identifying and validating homologous loci in commercially important crops such as wheat and barley under UK agronomic conditions.

Key measures

Plant group productivity in high-density stands, individual fitness under competition, root competition intensity, disease resistance, allele frequency and phenotypic effects at identified loci

Outcomes reported

The study identified a major effect locus in Arabidopsis thaliana where a rare allele increased cooperation and productivity in high-density stands whilst reducing root competition and enhancing disease resistance. The findings demonstrate that pleiotropic effects may maintain latent genetic variation for cooperation in natural populations.

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