Identification of drought-tolerant genotypes of Linum usitatissimum L. based on the use of the index method

An important aspect in assessing source material of fiber flax is its screening for adaptability. Ten varieties of flax were tested under osmotic stress conditions. The seeds were used (reproduction: Tyumen region, Nizhnetavdinsky district, 2018-2020, n = 20), germinated in distilled water (control) and two media with sucrose solutions (E1-5.0% and E2-8.0%) in Petri dishes in quadruple replication. The analysis of variance (ANOVA) revealed reliable (p> 0.05, p> 0.01) differences between varieties for a number of characteristics. The contribution of genotype (34.5-23.4%, shoot length, shoot dry weight), environment (62.1-19.8%, chlorophyll content, shoot length), and genotype and environment interaction (51.7-41.4%, shoot length, root dry weight) were established. According to the germination index FGR,%, the following varieties were distinguished: Yarok (E1, E2, 87.2-52.1%), Grant (E1, E2, 80.1-54.9%), Velizhsky Kryazh (E1, E2, 75.2-63.3%), Smolich (E2, 64.3%), Upite-2 (E2, 61.8%). According to the SSI index - Yarok (E1, E2, 0.34-0.11, shoot length, root length, root fresh weight), Grant (E1, E2, 0.26-0.10, root length and its fresh weight), Alizee (E1, E2, 0.59-0.36, root length, shoot length, fresh weight), Lvovsky-7 (E2, 0.37, chlorophyll content). According to STI the following varieties were selected: Yarok (E1, E2, 1.06-0.32, root length, shoot fresh weight, chlorophyll content), Velizhskiy Kryazh (E1, 0.65-0.38, shoot length and its dry weight), Smolich (E1, E2, 1.14-0.83, root length and its fresh and dry weight), Minamishy (E1, E2, 1.18-0.77, shoot fresh and dry weight). According to the tolerance index (TOL) the following varieties were selected: Yarok (E1, E2, 10.2-7.8, root length, shoot length), Grant (E1, E2, 15.9-6.2, root length and its fresh and dry weight), Tomskiy-16 (E1, E2, 10.1-3.7, shoot length, root fresh weight, chlorophyll content). Drought resistance (DR) was shown by the following varieties - Grant (E1, E2, 9.3-4.8, root length, fresh weight, shoot length), Yarok (E1, 3.2-1.2, root length, its fresh weight, shoot length), Smolich (E1, 10.5-6.6, shoot length).