Autotetraploid Induction of Three A-Genome Wild Peanut Species, , , and .

A-genome species (AA; 2n = 2x = 20) are commonly used as secondary germplasm sources in cultivated peanut breeding, L. (AABB; 2n = 4x = 40), for the introgression of various biotic and abiotic stress resistance genes. Genome doubling is critical to overcoming the hybridization barrier of infertility that arises from ploidy-level differences between wild germplasm and cultivated peanuts.