Registration of three peanut allotetraploid interspecific hybrids resistant to late leaf spot disease and tomato spotted wilt

Cultivated peanut (Arachis hypogaea L.) has a narrow genetic base and is isolated from its wild relatives. This genetic bottleneck results in a lack of strong resistance to biotic and abiotic stress. However, high levels of genetic variation and resistance exist among the wild relatives. In order to enlarge the genetic base of cultivated peanut and introgress beneficial alleles from the wild relatives, interspecific hybrids were produced among a set of selected diploid species. Upon colchicine treatment, fertile allotetraploids were recovered from three combinations including (A. ipaensis KG 30076 x A. correntina GKP 9530)(4x) (Reg. no. GP-241, PI 695391), (A. ipaensis KG 30076 x A. duranensis KGBSPSc 30060)(4x) (Reg. no. GP-242, PI 695392), and (A. valida KG30011 x A. stenosperma V 10309)(4x) (Reg. no. GP-243, PI 695393). All of them demonstrated high levels of resistance to leaf spot diseases in the field. Tolerance to Tomato spotted wilt virus was found in (A. valida KG 30011 x A. stenosperma V 10309)(4x). These newly created allotetraploids are cross-compatible with cultivated peanut. These genetic resources will provide peanut breeding researchers with new sources of disease resistances to improve the agronomic performance of cultivated peanut.

Automated summary

Research successfully introduced new disease-resistant genes into cultivated peanuts using wild relatives, resulting in peanut varieties resistant to leaf spot diseases and having high hardness. These newly created allotetraploids are cross-compatible with cultivated peanuts, providing new genetic resources for breeding researchers to improve cultivated peanut agronomic performance.