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Genetic resistance offers a sustainable solution, but often succumbs to breakdown in the absence of stewardship. Sourcing and incorporating novel diverse alleles in breeding programs is challenging yet enhanced by mining unexplored gene pools available in gene banks. In this study, we investigated 318 barley accessions of Eastern European origin for BLR resistance using detailed greenhouse-based host\u2013pathogen interaction assays at the seedling stage. The panel was genotyped using two marker platforms, targeted genotyping-by-sequencing and Infinium\u2122 Wheat Barley 40\u00a0K BeadChip Array. Following marker curation, 35,059 SNPs were used for genome-wide association studies (GWAS) using GAPIT\/FarmCPU, with associated regions further supported using a BayesR approach. GWAS identified significant peaks corresponding to known resistance loci, including\n                      <jats:italic>Rph2<\/jats:italic>\n                      ,\n                      <jats:italic>Rph3<\/jats:italic>\n                      and\n                      <jats:italic>Rph12<\/jats:italic>\n                      , as well as potentially uncharacterised BLR resistance QTL on chromosomes 1HL, 2HL, 3HS and 6HS. Several biparental populations were also developed by crossing three diverse EEB donors carrying broadly effective BLR resistance including: Caspian, Anska and Athenais, with the leaf rust-susceptible barley cultivar Gus. Genetic analysis at the F\n                      <jats:sub>3<\/jats:sub>\n                      generation revealed that resistance Athenais was consistent with two-gene inheritance, whereas resistance in Caspian was controlled by a single dominant gene (\n                      <jats:italic>RphCas<\/jats:italic>\n                      ) and the inheritance of resistance in Anska was inconclusive. Bulked segregant RNA sequencing and conventional bulked segregant analysis (BSA) mapped the Caspian resistance locus to chromosome 4HL. An allelism test using an F\n                      <jats:sub>3<\/jats:sub>\n                      population derived from Riccardo, carrying\n                      <jats:italic>Rph21<\/jats:italic>\n                      , and Caspian, tested with a\n                      <jats:italic>Puccinia hordei<\/jats:italic>\n                      pathotype (5457P+) avirulent to both resistance sources, susggested that the\n                      <jats:italic>RphCas<\/jats:italic>\n                      locus was distinct from\n                      <jats:italic>Rph21<\/jats:italic>\n                      however their close physical proximity and haplotypic similarity requires further investigation for a formal gene designation for\n                      <jats:italic>RphCas<\/jats:italic>\n                      .\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00122-026-05405-4","type":"journal-article","created":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T10:11:40Z","timestamp":1792231900000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Genome-wide characterisation of leaf rust resistance loci in an Eastern European barley collection"],"prefix":"10.1007","volume":"139","author":[{"given":"Shiva","family":"Azizinia","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Md","family":"Arifuzzaman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eden","family":"Tongson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karanjeet","family":"Sandhu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gabriel","family":"Keeble-Gagn\u00e8re","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ghazanfar Abbas","family":"Khan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kerrie","family":"Forrest","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew","family":"Hayden","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dragan","family":"Perovic","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Davinder","family":"Singh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4199-7359","authenticated-orcid":false,"given":"Peter M.","family":"Dracatos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,10,17]]},"reference":[{"key":"5405_CR1","doi-asserted-by":"publisher","first-page":"10860","DOI":"10.3390\/ijms241310860","volume":"24","author":"M Arifuzzaman","year":"2023","unstructured":"Arifuzzaman M, Jost M, Wang M et al (2023) Mining the Australian Grains Gene Bank for Rust Resistance in Barley. 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