The purpose of comparative studies was to evaluate promising lineages of longstalked flax (Linum usitatissimum L.) according to a set of selective significant traits and their adaptability in the conditions of the North-West region of the Russian Federation. The research was carried out in 2020–2022 on sod-podzolic, cultivated, light loamy soil. Meteorological conditions in these years differed markedly: the HTC for the growing season was 1,05 in 2020; 2,07 in 2021; 1,43 in 2022. The share of the influence of the conditions of the year significantly prevailed on the plant height formation (76,4%), the growing season duration (59,7%), the flax seed yield (71,9%), straw (56,2%) and fiber (39,2%); and the share of genotype in the formation of fiber content in the stem (69,9%). Based on three-year data on the set of traits, two best lineages were identified: P-4880-6-3b-5 and P-4828-1-5b-7, early maturing (74; 72 days), with resistance to lodging (4,7; 4,8 points) and diseases (90,3; 98,8%); exceeding the standard in straw yield (43,8 c/ha) by 8 and 2 c/ha; with a high fiber content (38,2; 39,4%) and fiber yield (19,7; 18,0 c/ha), significantly exceeding the standard by 7,3 and 10,7%; 27,1 and 16,1%, respectively. These lineages had the greatest adaptive potential: low variability of traits, high realization of productivity potential, plasticity, stress resistance and general adaptive ability. Using these lineages as a starting material will make it possible to create new highly productive varieties of long-stalked flax with a wide adaptive potential in the conditions of the North-West region of the Russian Federation.

Stepin Aleхander D., Rysev Mikhail N., Ryseva Tamara A., Utkina Svetlana V., Zvonikova Yulia N.

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