Estimation of Heritability by Parent-offspring Regression for High-oleic Acid in Peanut

Abstract

Oleic acid in peanut oil increases shelf-life and kernel quality. Heritability for oleic acid is important for predicting selection progress. The aims of this study were to estimate the heritability of oleic acid content by parent-offspring regression and to determine the correlation among oil characters. The data were collected in the F2 and F3 generations derived from the crosses between two high-oleic peanuts (SunOleic 97R and Georgia-02C) and a low oleic peanut (KKU 1). The F2 populations were planted in the rainy season (2008) and the F3 populations derived from the F2 populations were planted in the dry season (2008/09) at Khon Kean University. Heritability estimates in narrow sense were intermediate to high for oleic and linoleic acids (0.63-0.72 and 0.57-0.72, respectively). Heritability estimates for % oil were low in all populations. Significant and negative correlation was observed between oleic and linoleic acids (r = -0.98). The high heritability for oleic acid in this study indicated that selection for high oleic acid in peanut was effective in the F2 generation