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bioRxiv · 10.1101/2025.10.31.685778

Golden Promise-rapid, a fast-cycling barley genotype with high transformation efficiency

Buchmann, G.·Haraldsson, E. B.·Schüller, R.·Rütjes, T.·Walla, A. A.·von Korff Schmising, M.·Liu, S.
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Abstract

The spring barley cultivar Golden Promise (GP) is the major reference genotype for transformation due to its high transformability and availability of a reference genome. However, GP is characterized by a long generation cycle and stress susceptibility under non-optimal growth conditions because it carries a mutation at the floral inducer Photoperiod-H1 (Ppd-H1). Previously, we showed that a GP introgression line, Golden Promise-fast (GP-fast), generated by introducing the wild-type Ppd-H1 allele from the winter barley cultivar Igri, exhibits early flowering and improved stress resilience. In this study, we generated a fast-cycling genotype, Golden Promise-rapid (GP-rapid), isogenic to GP with high transformation efficiency. We conducted two backcrosses of GP-fast to reduce the residual Igri genome. The resulting genotype contains only a single introgression of approximately 0.6 Mbp at the Ppd-H1 locus on chromosome 2H. Under speed breeding conditions, its generation time was reduced to 63 days (25% shorter than GPs 84 days). Parallel transformation of GP, GP-fast, and GP-rapid using CRISPR/Cas9-mediated genome editing of Ppd-H1 revealed high regeneration and transformation efficiencies of GP-rapid, comparable to GP. Overall, we report on the development of a fast-cycling GP isogenic line as a research tool for efficient generation of transgenic and gene-edited barley plants. HighlightsA new fast-cycling barley genotype, GP-rapid, reduces generation time by 25% while retaining high transformation efficiency, advancing functional genomic studies in barley.

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Buchmann, G., Haraldsson, E. B., Schüller, R., Rütjes, T., Walla, A. A., von Korff Schmising, M., Liu, S.. 2025-10-31. Golden Promise-rapid, a fast-cycling barley genotype with high transformation efficiency. https://doi.org/10.1101/2025.10.31.685778

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