Location: Peanut and Small Grains Research UnitTitle: Towards development of a near-isogenic introgression population of peanut
|BUROW, MARK - Texas A&M Agrilife|
|TENGEY, THEOPHILUS - Savanna Agricultural Research|
|OTENG-FRIMPONG, RICHARD - Savanna Agricultural Research|
|WHEELER, TERRY - Texas A&M Agrilife|
|GAUS-BOWLING, THERESA - Amarillo College|
|MENDU, VENUGOPAL - Montana State University|
|PHAM, HANH - Texas A&M Agrilife|
|CASON, JOHN - Texas A&M Agrilife|
|SIMPSON, CHARLES - Texas A&M Agrilife|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 4/30/2023
Publication Date: N/A
Interpretive Summary: Peanut wild species are a reservoir of relatively-untapped and useful genetic variation. However, the introduction of desirable traits for resistance to biotic and abiotic stress can be accompanied by undesirable agronomic traits such as low yield. We have begun a program using traditional breeding approaches to develop cultivated peanut lines, each containing only useful wild species traits. We also obtained 4,500 polymorphic high-resolution genetic markers to assist with genetic marker-assisted selection of desirable genotypes. Peanut lines from one generation derived from wild species is being screened for resistance to root-knot nematodes and colonization by Aspergillus flavus, and additional lines will be screened for resistance to leaf spots. These lines will be useful to peanut breeders for developing new cultivars with improved resistance to diseases and abiotic stress. USDA is an equal opportunity provider and employer.
Technical Abstract: Peanut wild species are a reservoir of relatively-untapped genetic variation; however, introduction of useful novel alleles for tolerance to biotic and abiotic stress can be accompanied by linkage drag for alleles for low yield or undesirable agronomic traits. We have begun a program of marker-assisted backcrossing to develop near-isogenic introgression lines in a common cultivated genetic background. We have obtained 4,500 polymorphic high high-resolution SNPs to add to the KASP map of the BC1 population already developed. Using markers in the BC3F6 population, we have made crosses to develop BC4 lines. The BC3-derived population is being phenotyped for resistance to root-knot nematodes and resistance to Aspergillus flavus colonization. Further crosses by selected BC3-derived lines have developed populations to validate resistance to leaf spots and A. flavus colonization in different runner and Spanish backgrounds. Phenotypic characterization has indicated that alleles for resistance have been introduced and are being expressed in Spanish populations. USDA is an equal opportunity provider and employer.