Research shows that barley seed dormancy is primarily regulated by haplotypes of the MKK3 gene, which include copy number variation and varying kinase activity of the protein.1][2][3] After domestication, specific MKK3 haplotypes were selected to adapt dormancy levels to local climatic conditions and farming practices.1][2][3][4] For example, in northern Europe, hyperactive variants with low dormancy have evolved suitable for malting and brewing, while in humid areas of eastern Asia, higher dormancy types have persisted to prevent premature germination (PHS).[1] Shortening dormancy has stuck rapid and uniform agricultural germination, but increases the risk of PHS with annual losses exceeding US$1 billion.[2][3] Domesticated barley often contains more copies of the MKK3 gene compared to its wild ancestor, which, combined with amino acid changes, significantly affects dormancy and resistance to PHS.1 The study provides a genetic framework for breeders to balance seed dormancy and PHS prevention.[2][3] The study provides a genetic framework for breeders to balance seed dormancy and PHS prevention.