Abstract
The erectoides-m anthocyanin-less 1 (ert-m ant1) double mutants are among the very few examples of induced double mutants in barley. From phenotypic observations of mutant plants it is known that the Ert-m gene product regulates plant architecture whereas the Ant1 gene product is involved in anthocyanin biosynthesis. We used a near-isogenic line of the cultivar Bowman, BW316 (ert-m.34), to create four F2-mapping populations by crosses to the barley cultivars Barke, Morex, Bowman and Quench. We phenotyped and genotyped 460 plants, allowing the ert-m mutation to be mapped to an interval of 4.7 cM on the short arm of barley chromosome 7H. Bioinformatic searches identified 21 candidate gene models in the mapped region. One gene was orthologous to a regulator of Arabidopsis thaliana plant architecture, ERECTA, encoding a leucine-rich repeat receptor-like kinase. Sequencing of HvERECTA in barley ert-m mutant accessions identified severe DNA changes in 15 mutants, including full gene deletions in ert-m.40 and ert-m.64. Both deletions, additionally causing anthocyanin deficiency, were found to stretch over a large region including two putative candidate genes for the anthocyanin biosynthesis locus Ant1. Analyses of ert-m and ant1 single- and double-deletion mutants suggest Ant1 as a closely linked gene encoding a R2R3 myeloblastosis transcription factor.
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Acknowledgments
We thank Mateusz Kania for excellent technical assistance. This work was supported by the Carlsberg Foundation, GUDP (Denmark, 34009-12-0522), Deutsche Forschungsgemeinschaft (Germany, DO1482/1-1), the Nilsson-Ehle Foundation at the Royal Physiographic Society in Lund, and the Erik Philip-Sörensen Foundation.
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Carlsberg has supported and financed a major part of this work and the right to publish is granted under the provision that Carlsberg maintains all rights (incl. future intellectual property rights granted to new industrial collaborators) to use the genes, traits and phenotypes described in the publication to advance current and future commercial interests of the Carlsberg Group.
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Shakhira Zakhrabekova and Christoph Dockter have contributed equally to this work.
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Zakhrabekova, S., Dockter, C., Ahmann, K. et al. Genetic linkage facilitates cloning of Ert-m regulating plant architecture in barley and identified a strong candidate of Ant1 involved in anthocyanin biosynthesis. Plant Mol Biol 88, 609–626 (2015). https://doi.org/10.1007/s11103-015-0350-x
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DOI: https://doi.org/10.1007/s11103-015-0350-x