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ARS Home » Southeast Area » Tifton, Georgia » Crop Genetics and Breeding Research » Research » Publications at this Location » Publication #381951
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 TifGP-3 and TifGP-4 peanut germplasm lines

Author
item Holbrook, Carl - Corley
item OZIAS-AKINS, PEGGY - University Of Georgia
item CHU, YE - University Of Georgia
item LAMON, SAMUELE - University Of Georgia
item BERTIOLI, DAVID - University Of Georgia
item LEAL-BERTIOLI, SORAYA C.M. - University Of Georgia
item CULBREATH, ALBERT - University Of Georgia
item GODOY, IGNACIO - Agronomical Institute Of Campinas (IAC)

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/28/2021
Publication Date: 10/21/2021
Citation: Holbrook Jr, C.C., Ozias-Akins, P., Chu, Y., Lamon, S., Bertioli, D.J., Leal-Bertioli, S., Culbreath, A.K., Godoy, I.J. 2021. Registration of TifGP-3 and TifGP-4 peanut germplasm lines. Journal of Plant Registrations. 16:120-123. https://doi.org/10.1002/plr2.20179.
DOI: https://doi.org/10.1002/plr2.20179

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 very high levels of resistance were selected for release. The resistance is due to introgressed genes from a wild diploid relative of peanut. Genetic markers can be used to determine the presence or absence of each introgressed segment which will allow breeders to use marker assisted selection.. Releasing leaf spot resistant germplasm packaged with breeder friendly genetic markers should accelerate peanut breeding progress

Technical Abstract: Late leaf spot (LLS) disease caused by Nothopassalora personata(Berk, & M.A. Curtis) U. Braun, C. Nakash, Videira & Crous is a foliar disease that plagues peanut production worldwide. Chemical control is expensive, sometimes inaccessible, and can be difficult to apply. One effective solution to control this disease would be the development of resistant cultivars. IAC 322 is a breeding line resistant to LLS due to alien introgressions from A. cardenasii Krapov. & W.C. Gregory, a wild diploid relative of peanut. We crossed ‘TifNV-High O/L’ with IAC 322 to develop a segregating breeding population. Two lines with very high levels of resistance to LLS were selected and genotyped. Line S07 (TifGP-3) has introgressed segments from A. cardenasii on top of chromosome A02, the bottom of A02 and the bottom of A03. The level of resistance to LLS observed in these two lines was not significantly different. Segments on the top of A02 combined with the bottom of A03 accounted for the majority of LLS resistance. Some breeders may choose to use TifGP-4 to minimize the chance of linkage drag. However, important traits may be found to reside in the segment on the bottom of A02 so we are also releasing TifGP-3. KASPar assays can be used to determine the presence or absence of each introgressed segment which will allow breeders to use marker assisted selection. These two germplasm lines were jointly released by USDA-ARS and UGA in 2021.