BioProject

The evolutionary basis of reproductive success in different environments is of a major interest in the study of plant adaptation. More...

The evolutionary basis of reproductive success in different environments is of a major interest in the study of plant adaptation. Since the reproductive stage is articularly sensitive to drought, genes affecting reproductive success during that stage are key players in the evolution of adaptive mechanisms. We used an ecological genomics approach to investigate the reproductive response of drought-tolerant and sensitive wild barley accessions originating from different habitats in the Levant. We sequenced mRNA extracted from spikelets at flowering stage in drought-treated and control plants. The barley genome was used for reference-guided assembly and differential expression analysis. Our approach enabled to detect biological processes affecting grain production under drought stress. We detected novel candidate genes and differentially expressed alleles associated with drought tolerance. Drought associated genes were shown to be more conserved than non-associated genes, and drought-tolerance genes were found to evolve more rapidly than other drought associated genes. We show that reproductive success under drought stress is not a habitat-specific trait but a shared physiological adaptation that appeared to evolve recently in the evolutionary history of wild barley. Exploring the genomic basis of reproductive success under stress in crop wild progenitors is expected to have considerable ecological and economical applications. Less...