Description

Abstract: Increasing the ratio of oleic to linoleic acid (O/L) in peanut (Arachis hypogaea L.) significantly improves the nutritional and quality attributes of the crop. In currently grown cultivars, the O/L ratio ranges from 0.8 to 2.5. Variation in peanut for O/L ratio has been characterized, and the O/L ratio is digenically inherited at two loci designated as Ol1 and Ol2. Previous research has been conducted with Virginia- and runner-type peanut; however, there have been no reports regarding the inheritance and allele frequency at those loci in Spanish-type peanut. The objectives of this study were to determine if the inheritance of the high oleate trait in Spanish-type peanut is similar to that previously reported and to determine the allelic composition of Spanish-type peanut at Ol1 and Ol2. Six different Spanish-type peanut cultivars (low oleate) were hybridized with F432-2-2 (high oleate). F2 and BC1F1 progenies were evaluated for the O/L ratio. Segregation patterns indicated that high oleic acid Content is digenically inherited in Spanish-type peanut, but there seems to be more allelic variation both within and among these cultivars. In addition, variation within the high and low oleate ratio classes indicated that other factors may be involved in determining the precise O/L ratio.