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1000
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Abstract/Summary
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Barley is a diploid species with a genome smaller than those of other members of the Triticeae tribe, making it an attractive model for genetic studies in Triticeae crops. The recent development of barley genomics has created a need for a high-throughput platform to identify genetically uniform mutants for genes functional investigation. In this study, we reported an ethyl methanesulfonate (EMS)-mutagenized population consisting of 8,525 M3 lines in the barley landrace ‘Hatiexi’ (HTX), which we complement with a high-quality de novo assembly of a reference genome for this genotype. The mutation rate within the population ranged from 1.51 to 4.09 mutations per Mb, depending on the treatment dosage of EMS and the mutation discrimination platform employed for genotype analysis. We implemented a three-dimensional DNA pooling strategy combined with multiplexed amplicon-sequencing to create a highly efficient and cost-effective TILLING (Targeting Induced Locus Lesion IN Genomes) platform in barley. Mutations were successfully identified from 72 mixed amplicons within a DNA pool containing 64 individual mutants, and from 56 mixed amplicons within a pool containing 144 individuals. We discovered abundant allelic mutants for dozens of genes, including the barley green revolution contributor gene Brassinosteroid insensitive1 (BRI1). As a proof of concept, we rapidly determined the causal gene responsible for a chlorotic mutant by following the MutMap strategy, demonstrating the value of this resource to support forward and reverse genetic studies in barley.
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