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

摘要

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 regressionand to determine the correlation among oil characters. The data were collected in the F_2 and F_3 generations derived from the crosses between two high-oleic peanuts (SunOleic 97R and Georgia-02C) and a low oleic peanut (KKU 1). The F_2 populations wereplanted in the rainy season (2008) and the F_3 populations derived from the F_2 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 F_2 generation.