Comprehensive assessment of Linum usitatissimum L. genotypes by phenotypic characteristics and stability in the conditions of the subtaiga agroecological zone of the Tyumen region

The article presents the results of testing 12 hybrid combinations of fiber flax F3-F5 obtained based on interparietal crossings of four initial parental forms (Yarok, Grant, Alizee, Betertelsdorf 6884/60) for a set of morpho-biological parameters considering their ecological stability. Field research was carried out at the Biological Station of Tyumen State University "Lake Kuchak" (Nizhnetavdinsky District, Tyumen Region, 57°21' N, 66°04' E). Reliable differences (p<0.05; p<0.01) between them for all the studied traits were revealed. In the total phenotypic variability of the studied traits, the maximum influence of genotype-environment interactions (48.5%) was determined. A group of stable (bi=1.0, S2di=0, G1, G2, G3, G4, G5, G6, G8, G9), highly (bi<1.0, S2di=0) and weakly responsive (bi>1.0, S2di=0) hybrids was determined. Using the index (SI), the most stable of them in two groups were determined (SI=61.0-80.0% and 81.0-100.0%). According to the stability index (I), valuable flax genotypes were identified by plant height (G1, G2), number of capsules (G1, G2, G10), number of seeds in 1 capsule (G1, G8), and vegetation period (G1, G2, G8). Using the Kang rank criterion (RS), two groups by stability were identified, of which the first has the highest value for plant height (G1, G3, G5), inflorescence length (G1), number of capsules (G1, G6, G10, G11), number of seeds in 1 capsule (G8), fiber content (G1, G3, G5, G12), and vegetation period (G4). Hybrid combinations (G1, G2, G3, G5, G6, G7, G11) were selected, which are of the greatest practical interest for the selection process.