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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #381587

Research Project: Development of High-Yielding, High-Oleic Peanut Cultivars or Germplasm with Tolerance to Biotic and Abiotic Stresses

Location: Crop Genetics and Breeding Research

Title: Registration of two peanut recombinant inbred lines (TifGP-5 and TifGP-6) resistant to late leaf spot disease

item CHU, YE - University Of Georgia
item CLEVENGER, JOSH - University Of Georgia
item Holbrook, Carl - Corley
item ISLEIB, THOMAS - North Carolina State University
item OZIAS-AKINS, PEGGY - University Of Georgia

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/22/2022
Publication Date: 7/18/2022
Citation: Chu, Y., Clevenger, J.P., Holbrook Jr, C.C., Isleib, T.G., Ozias-Akins, P. 2022. Registration of two peanut recombinant inbred lines (TifGP-5 and TifGP-6) resistant to late leaf spot disease. Journal of Plant Registrations.

Interpretive Summary: Late leaf spot disease (LLS) is one of the more serious peanut diseases due to its widespread occurrence across the world and the high percentage of yield reduction in susceptible cultivars. Intense fungicide programs have been implemented routinely in the US to control LLS. Host resistance to LLS is much needed to reduce management costs of fungicide sprays and improve the sustainability and profitability of peanut farming. A breeding population that was segregating for leaf spot resistance was developed and two lines with a high level of resistance were selected for release. Three genetic markers on different chromosomes were associated with this resistance. Releasing leaf spot resistant germplasm packaged with breeder friendly genetic markers should accelerate peanut breeding progress.

Technical Abstract: Late leaf spot disease is an omnipresent peanut foliar disease that causes significant yield loss to peanut production. Integrating host resistance to reduce yield loss and management costs from this disease is highly desirable. In addition to disease resistance, market demand for high oleic peanut is on the rise due to its improved oxidative stability and health benefit. Previously, a recombinant inbred population from Florida-07 x GP-NC WS 16 segregating for both late leaf spot resistance and high oleic traits was used to perform genetic mapping for late leaf spot resistance by QTL-seq analysis. Three QTL regions on chromosomes B03, A05 and B05 were identified and KASPar markers flanking these regions were validated through a field-test on genotypically selected sister lines. Two recombinant inbred lines with top levels of field resistance to late leaf spot were selected from this population for release. Both lines possess the resistance alleles of all the genetic markers. One line has high oleic acid content and the other is normal oleic. Releasing these recombinant inbred lines packaged with molecular markers provides the peanut breeding community with genetic resources that can be utilized through marker assisted breeding.