Climatic changes permit the spread of plant diseases to new areas. To ensure grain production meets the needs of the growing world population, wheat breeding must combine multiple disease resistances in single cultivars in order to maintain current yield potential. Over the last three decades, classical mapping and association studies have identified disease resistance loci for individual diseases, but few studies have investigated loci that confer resistance to multiple diseases. To address this limitation, we extensively surveyed the literature to identify wheat genomic regions harboring resistance to multiple diseases. We identified 174 trait-linked markers distributed across all wheat chromosomes, except chromosome 4A, and the numbers of disease resistance loci in each region ranged from two to ten. Our survey suggests that some regions of the genome contain multiple disease resistance genes, or genes with pleiotropic effects. We are using the Chinese Spring flow sorted chromosome survey contigs to investigate the genic contents of genomic regions containing multiple disease trait loci to address this question.
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