Development and Complex Application of Methods for the Identification of Mutations in the <i>FAD3A</i> and <i>FAD3B</i> Genes Resulting in the Reduced Content of Linolenic Acid in Flax Oil
2022
Liubov V. Povkhova | Elena N. Pushkova | Tatiana A. Rozhmina | Alexander A. Zhuchenko | Roman I. Frykin | Roman O. Novakovskiy | Ekaterina M. Dvorianinova | Aleksey A. Gryzunov | Elena V. Borkhert | Elizaveta A. Sigova | Gleb N. Vladimirov | Anastasiya V. Snezhkina | Anna V. Kudryavtseva | George S. Krasnov | Alexey A. Dmitriev | Nataliya V. Melnikova
Flax is grown worldwide for seed and fiber production. Linseed varieties differ in their oil composition and are used in pharmaceutical, food, feed, and industrial production. The field of application primarily depends on the content of linolenic (LIN) and linoleic (LIO) fatty acids. Inactivating mutations in the <i>FAD3A</i> and <i>FAD3B</i> genes lead to a decrease in the LIN content and an increase in the LIO content. For the identification of the three most common low-LIN mutations in flax varieties (G-to-A in exon 1 of <i>FAD3A</i> substituting tryptophan with a stop codon, C-to-T in exon 5 of <i>FAD3A</i> leading to arginine to a stop codon substitution, and C-to-T in exon 2 of <i>FAD3B</i> resulting in histidine to tyrosine substitution), three approaches were proposed: (1) targeted deep sequencing, (2) high resolution melting (HRM) analysis, (3) cleaved amplified polymorphic sequences (CAPS) markers. They were tested on more than a thousand flax samples of various types and showed promising results. The proposed approaches can be used in marker-assisted selection to choose parent pairs for crosses, separate heterogeneous varieties into biotypes, and select genotypes with desired homozygous alleles of the <i>FAD3A</i> and <i>FAD3B</i> genes at the early stages of breeding for the effective development of varieties with a particular LIN and LIO content, as well as in basic studies of the molecular mechanisms of fatty acid synthesis in flax seeds to select genotypes adequate to the tasks.
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