Novel peanut genotype with low behenic acid developed from recombinant inbred lines

Abstract

<p indent="0mm">Peanut is an important source of edible vegetable oil in China, and improving the quality of peanut oil is an important goal in peanut breeding. In this study, the contents of very long-chain saturated fatty acids (arachidic acid, behenic acid, and tetracosanoic acid) were determined by using RIL population containing 140 lines derived from the cross between Zhonghua 10 and ICG12625 with different genetic backgrounds. The content of very long- chain saturated fatty acid in the RILs was 4.27%–7.05%, with an average of 5.54%, the minimum value was 1.46 and 1.63 percentage points lower than that of male and female parents, with reduction rates of 25.27% and 27.62%, respectively. The behenic acid content ranged from 1.86% to 3.37%, with an average of 2.53%. Three lines of QT0002, QT0075, and QT0120 had behenic acid content lower than 2%, which was 0.57, 0.51, and 0.51 percentage points lower than that of Zhonghua10 with the reduction rate of 23.45%, 20.98%, and 20.98%, respectively. A stable QTL located in 13.31–16.34 M of B04 was detected using a linkage map and WinQTLcart software. In this region of 13.31–16.34 M contained 131 prediction genes. The results lay a foundation for the genetic improvement of low behenic acid and high-oleic peanut varieties.