Novel Germplasm with High Oil Content and Resistance to Aspergillus flavus and Bacterial Wilt Developed from Peanut Recombinant Inbred Lines

Abstract

The enhancement of resistances to aflatoxin contamination and bacterial wilt is one of the major objectives in peanut (Arachis hypogaea L.) breeding for high oil content. In this study, 117 recombinant inbred lines (RILs) were developed through crossing peanut varieties Yuanza 9102 and Zhonghua 5. Genetic analysis revealed that aflatoxin resistance was controlled by 2 major genes plus additive polygenes and seed oil content controlled by 2 suppressive major genes plus additive polygenes. The RILs showed transgressive segregations in aflatoxin and oil content compared to their parents. Eighteen high oil content lines with resistance to aflatoxin contamination or bacterial wilt were selected from the RILs population. Among them, line J091 exhibited resistance to both diseases. The 18 RILs had genetic diversity based on phenotyping and molecular marker analyses.