Association Mapping DNA Markers to Leaf Spot Resistance in Cultivated Peanuts that can be used in Breeding Program


Auburn University

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Southeast (GA, FL, AL)

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Peanut growers in the United States rely on new cultivars to combat biotic and abiotic stress. Research gaps exist for the identification of molecular markers that can be associated with yield and disease resistance. As a serious concern, early and late leaf spots in peanut can reduce anticipated yield by 10-20% and up to 50% if not controlled. Currently fungicides can manage both pathogens; however, disease resistant cultivars would provide more cost-effective control. From a breeding's perspective, high yield combined with high levels of resistance to leaf spot diseases while maintaining acceptable market traits has proven very difficult to achieve. Therefore, the discovery of various alleles contributing to leaf spot resistance in Arachis germplasm is necessary for further breeding toward a high level of resistance to leaf spot through pyramiding alleles/genes, a strategy to overcome partial resistance to a disease. These resistant allele-specific makers will be applied in the peanut breeding program to improve leaf spot resistance. The objective for Year 2 of the proposed three-year project was to discover desirable alleles contributing to leaf spot resistance in Arachis germplasm through association analysis. 

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