Climate-driven niche tracking and genomic resilience shape future distribution of a widespread agricultural weed

The study of agriculturally significant species' responses to environmental change is essential for preserving productivity, reducing threats in agroecosystems, and maintaining resilience. Agricultural weeds, often subjected to stronger selective pressures, serve as valuable models for studying ecological and evolutionary adaptations to climatic and human-mediated challenges.

Researchers have now analyzed two centuries of distribution records combined with whole-genome sequencing data from natural populations of the most detrimental weed in Europe, Alopecurus myosuroides, also known as blackgrass. This research focused on how blackgrass maintains its historical climatic niche and expands its range by tracking environments similar to those it originally inhabited.

Genome-wide analysis uncovered a polygenic basis for environmental responses, with most loci linked to single environmental variables and some exhibiting limited environmental pleiotropy, indicating modular adaptation to the complex selective pressures of managed agricultural landscapes. By combining genomic-environment relationships with climate change projections and genomic offset analyses, the study predicts that most blackgrass populations will continue to align well with future conditions.

These findings reveal that ecological niche tracking and polygenic adaptation enable agricultural weeds like blackgrass to persist under rapid environmental changes. The insights gained from this research are not only relevant for weed management but also for designing resilient cropping systems in the face of future climate shifts.