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The Levant region is a critical biodiversity hotspot and the distribution edge for many species, including the wild ancestor of domesticated barley. This region is under an accelerated desertification process, thus enforcing a rapid genomic response to the projected environmental changes. To elucidate the genomic basis of rapid local adaptation, we studied wild barley populations using an ecological\u2010genetic sampling design that decouples environmental variation from demographic background. We collected and sequenced 300 wild barley individuals and evaluated the phenotypes of 3600 progeny plants over 3\u2009years. Our genomic analyses revealed that local adaptation is associated with clusters of candidate genes forming haplotype blocks. These clusters are enriched with environment and stress responsive genes, including flowering time regulators, drought and heat responsive genes. We identified six candidate adaptive haplotype blocks which span 1\u20138\u2009Mbp and are distributed across chromosomes 1H, 2H, 4H and 5H, each segregating as two major haplotypes. Additionally, we integrated over 2600 occurrence records into ecological and evolutionary modelling to assess the genomic vulnerability of populations to projected future climates. Our study identifies candidate genomic regions and environmental drivers of local adaptation in wild barley and highlights the advantage of haplotype blocks architecture in orchestrating an efficient response to rapid environmental change. We highlight the ecological factors most strongly associated with the observed evolutionary responses and provide insights and guidelines for biodiversity conservation and implementation of crop wild relatives in breeding.<\/jats:p>","DOI":"10.1111\/mec.70540","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T07:55:41Z","timestamp":1788249341000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Haplotype Blocks Are Associated With Rapid Local Adaptation to Environmental Shifts in Wild Barley"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-4878-930X","authenticated-orcid":false,"given":"Evgenii","family":"Potapenko","sequence":"first","affiliation":[{"name":"Department of Bioinformatics, Faculty of Sciences and Technology Tel Hai University of Kiryat Shmona in the Galilee  Upper Galilee Israel"},{"name":"Department of Evolutionary and 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