Inheritance Analysis of Oleic Acid and Linoleic Acid Content of Arachis hypogaea L.

【Objective】In order to understand the genetic basis of oleic acid content in peanut,the genetic models of oleic acid and linoleic acid was proposed by using F2 populations derived from crosses between normal-oleic and high-oleic genotypes.【Method】Four cross combinations were made between 4 genotypes with normal oleic acid content and 2 high-oleic genotypes,wt08-0932 and wt08-0934,respectively.The number of major genes controlling oleic acid and linoleic acid contents,their additive and/or dominant effects and heritabilities were estimated using genetic parameters based on genetic models.【Result】The results indicated that oleic acid and linoleic acid contents were controlled by two major genes with additive-dominant-epistatic effects.The heritabilities of the two major genes were 66%-89% for oleic acid and 70%-85% for linoleic acid,respectively,implying the existence of polygenic effects.Negative dominant effects were observed for both major genes controlling oleic acid content,while positive dominant effects were detected for linoleic acid content.【Conclusion】The oleic and linoleic acid contents in peanut were controlled by two major genes together with gene interactions and polygene effects.Both of the additive and dominant effects of the first major gene were much higher than that of the second one.The high oleic acid content resulted from the mutation effects of the two major genes and the medium-low and medium-high oleic acid content was the result of the single gene mutation depending on the additive and dominant effects of the individual gene.