Heritability of oleic acid content in sunflower seed oil of recombinant inbred lines

The study of the heritability of the oleic acid content in seed oil in recombinant inbred lines is the genetic basis for effective breeding work on the quality of sunflower oil. The experiments were carried out under field and laboratory conditions in VNIIMK, Krasnodar, Russian Federation in 2016-2020. We used 17 recombinant inbred sunflower lines of I4 and I5 generations obtained from crossing a medium-oleic LG27 line and a high-oleic LG26 line with subsequent self-pollination. The fatty acid composition of sunflower seed oil was analyzed using the method of gas-liquid chromatography of methyl esters on the Chromatek-Kristall 5000 device. Seventeen recombinant inbred sunflower lines in generation I4 showed a wide variation in the content of oleic acid in the oil of average seed samples from 39.00 % (RIL-1) to 92.24 % (RIL-42) and linoleic acid - from 43.28 to 1.35 %, respectively. In 2016, three lines were characterized by an average oleic acid content of 55.64-65.54 %. Analysis of the fatty acid composition of oil in individual seeds of the next generation I5 of these lines confirmed, in general, their phenotypic ranks with a range of variability from 32.18 to 92.15 % in the content of oleic acid. The middle oleic lines RIL-21, RIL-29 and RIL-30 also showed belonging to their phenotypic class in 2019 in the range of values from 59.80 to 63.14 %. The study of the conjugate variability of oleic acid values in the parent-progeny series in generations of I4-I5 revealed the presence of a significant strong positive correlation r = 0.97. At the same time, the coefficient of determination, defined as the square of the correlation coefficient which evaluates the degree of heritability of a trait, was 0.95, which indicates a significant influence of the genotype factor in general phenotypic variation.