L. P. Kudryavtseva
Federal Scientific Center of Bast Crops, Tver, Russia
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Volume 25 No. 1
Date of paper submission: 31.03.2024, date of review: 15.04.2024, date of acceptance: 27.04.2024
Published: 01/31/2025
Abstract. The study and selection of immune flax genotypes against an infectious background to fusarium wilt and rust for their use in breeding for resistance to this pathology is the purpose of our work. In the Northwestern region of the Tver Region (2019–2022), studies were conducted in vegetation and field conditions. using artificially provocative backgrounds of rust pathogens and fusarium wilt to determine the stability of flax. The work used collectible samples, flax breeding material and strains, isolates of rust and fusarium wilt pathogens from the pathogen collection. Methods. Field, vegetation and laboratory experiments were conducted according to the methods of the Flax Institute. Results. During four years of research (2019–2022), the “Collection of microorganisms – pathogens of major flax diseases” was replenished with 26 isolates of uredospores of the rust pathogen. 11 of them were characterized by an average and 15 slightly virulent reaction to test varieties. Of the 25 isolated fusarium isolates, to the type F. oxysporum owned 68.5 % of the studied biological samples, 31.5 % of the strains were classified as species of the genus Fusarium ‒ causative agents of fusarium browning. The dominant position was occupied by highly virulent strains (52.9 %), weakly virulent biological samples amounted to 11.8 %. Among the studied 351 genotypes, 213 samples and breeding lines of flax showed high resistance to rust at the level of 92.2–100 %, and 100 samples (28.5 %) had a highly resistant reaction to the pathogen to fusarium wilt. 12 collection samples and breeding lines of flax have shown high, stable group stability at the level of 81.5–100 % over the years of research: P-281, L-191, R-256-02, P-270, P-273, M-358, Diane, M-355, K-6862*, Ducat, Thaler, JVM-6. Scientific novelty. A long-term assessment of 351 genotypes using collectible biological samples allowed us to identify samples with group resistance to rust and fusarium wilt that need to be used in breeding programs.
Keywords: long-lived flax, variety, disease resistance, pathogen
Acknowledgements. The work was carried out with the support of the Ministry of Higher Education and Science of the Russian Federation within the framework of the State Task of the Federal State Budgetary Budgetary Institution “Federal Scientific Center for Bast Crops” (topic No. FGSS-2024-0005).
For citation: Kudryavtseva L. P. The importance of the “Collection of microorganisms – pathogens of flax diseases” in breeding work for resistance to fusarium wilt and rust. Agrarian Bulletin of the Urals. 2025; 25 (01): 2‒9. DOI: https://doi.org/10.32417/1997-4868-2025-25-01-2-9 (In Russ.)
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