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ARS Home » Plains Area » El Reno, Oklahoma » Oklahoma and Central Plains Agricultural Research Center » Peanut and Small Grains Research Unit » Research » Research Project #440432

Research Project: Prebreeding of peanut for resistance to root-knot nematodes and disease

Location: Peanut and Small Grains Research Unit

Project Number: 3070-21220-009-009-R
Project Type: Reimbursable Cooperative Agreement

Start Date: Apr 1, 2021
End Date: Mar 31, 2025

The goal of this proposal is to advance an existing, partially-characterized peanut wild species introgression population and generate near-isogenic introgression lines (NIILs) in a cultivated background, providing phenotypic data on the breeding lines, and marker data for use in selection. These NIILs will serve as a living repository for germplasm of wild species in an easily-accessible form for peanut breeders, and will be propagated as homozygous lines to serve as a long-term resource for phenotypic analysis, breeding, and study of gene introgression. Specific objectives are to: 1. Perform high-resolution SNP genotyping of the current backcross population. 2. Perform marker-assisted backcrossing to develop NIILs. 3. Phenotype NIILs for pest and disease resistance and seed quality traits, and identify QTLs 4. Increase seed of NIILs and release as a germplasm resource. The ARS investigator's specific objective will be to phenotype the near-isogenic introgression lines for disease resistance.

The near-isogenic introgression lines will be phenotyped in the field for early leafspot resistance at the Caddo Research Station in Fort Cobb, OK for three years. The near-isogenic introgression lines will be planted in plots consisting of two, 15'-long rows, using a randomized complete block design with three replications. Plots will be rated a minimum of two times during the field season by rating the percentage of leaves covered with leaf spot. Disease analyses will be conducted using mixed-model ANOVA in GLIMMIX (SAS, v. 4.0).