Genomic and Phenotypic Divergence in Wild Barley Driven by Microgeographic Adaptation

Area of Science:

• Evolutionary biology
• Plant genetics
• Ecological genomics

Background:

• Microgeographic adaptation is key to evolution, but its causes are unclear.
• Wild barley populations exhibit distinct traits due to local environmental pressures.

Purpose of the Study:

• Investigate phenotypic, genomic, and transcriptomic variations in wild barley.
• Identify candidate genes responsible for edaphic local adaptation at a microgeographic scale.

Main Methods:

• Common garden and reciprocal transplant experiments.
• Population resequencing, genetic, phylogenetic, and admixture analyses.
• Genome sweep analyses and integrated omics data.

Main Results:

• Significant phenotypic differentiation and local adaptation to soil types observed.
• Genetic divergence between basalt and chalk populations confirmed.
• Identified 445 candidate genes, including those for root architecture, metal transport, and ABA signaling, within selected genomic regions.
• HvMOR gene identified as a key regulator of root architecture for edaphic adaptation.

Conclusions:

• Edaphic factors significantly drive microgeographic adaptation in wild barley.
• Genetic and transcriptomic data pinpoint HvMOR as vital for root adaptation.
• Findings contribute to understanding the genetic basis of adaptation and potential speciation in barley.