Abstract
The introduction of semi-dwarf cereal crop varieties in the 1960s enabled extensive increases in global food production. Semi-dwarf barley cultivars have shorter stature and improved stress resistance, grain yield and quality than tall varieties. The major semi-dwarf genes, sdw1 and ari-e, have been widely used in barley breeding programmes worldwide. In this study, we identified a novel sdw1 allele in cv. Lockyer and investigated the effect of sdw1 and ari-e and their interactions on plant height, flowering time and grain yield using a Multi-parent Advanced Generation Inter-cross (MAGIC) population generated from four elite barley cultivars. Allele-specific markers combined with Kompetitive Allele Specific Polymerase Chain Reaction (KASP) assays were used for fast and accurate screening of plants with different allele combinations. The results showed that the novel sdw1 allele from cv. Lockyer had similar effects on plant growth and phenology as the known sdw1.d allele. The two semi-dwarf genes sdw1 and ari-e had an additive effect for plant height with height reductions up to 27 cm. The ari-e gene triggered earlier flowering up to 6 days compared to WT and reduced the delay in flowering time caused by the sdw1 gene. The two semi-dwarf genes boosted grain yields by 20% in the sdw1 plants and up to 28% in plants with the two combined semi-dwarf genes. The results presented will benefit the development of higher-yielding and better-adapted barley cultivars.
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Acknowledgements
VHD was funded by Murdoch University with the International Tuition Fee Scholarship (ITFS) and Murdoch Strategic Scholarship (MSS).
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This work was supported by the Grains Research and Development Corporation (No. UMU00050).
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CL and CBH conceptualised the project. VHD, TTA and LM contributed to field phenotyping. VHD and XZ contributed to genetic material collection and genotyping. VHD and CBH contributed to data analysis and interpretation and wrote the original paper. CL and CBH reviewed and edited the manuscript. VHD, CBH, XZ, TTA, LM and CL read and approved the final manuscript.
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Allele-specific molecular markers of semi-dwarf genes sdw1 and ari-e provide an accurate measurement of the genetic effects and their interactions for plant height, flowering time and grain yield.
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Dang, V.H., Hill, C.B., Zhang, XQ. et al. Genetic dissection of the interactions between semi-dwarfing genes sdw1 and ari-e and their effects on agronomic traits in a barley MAGIC population. Mol Breeding 40, 64 (2020). https://doi.org/10.1007/s11032-020-01145-5
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DOI: https://doi.org/10.1007/s11032-020-01145-5