Genetic Markers to Enhance Breeding of Peanut for Disease Resistances


Board of Regents of the University System of Georgia on behalf of the University of Georgia Cooperative Extension Service and University of Georgia Research Foundation, Inc.

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Southeast (GA, FL, AL)

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Control of pests and diseases in peanut requires considerable economic input for chemicals and application costs. Genetic resistance reduces or in some cases eliminates the need for certain chemical control. Mapping the genes that confer pest and disease resistance allows the identification of linked molecular markers that can be subsequently used for marker-assisted selection (MAS). In an effort to improve late leaf spot (LLS) resistance in peanut, we have evaluated a segregating population from the cross Florida-07 (susceptible) x SPT-06-06 (resistant) in the field for three years, and have observed wide segregation for LLS resistance. Molecular markers associated with this resistance have been identified. Development of additional molecular markers to identify those that are more tightly linked to resistance is almost complete and genotyping with these additional markers should yield dozens that potentially can be used for MAS. 

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