L.P. Kudryavtseva, L.N. Pavlova, N.I. Loshakova, O.V. Prasolova
All-Russian Flax Research Institute, ul. Lunacharskogo, 35, Torzhok, Tverskaya obl., 172002, Russian Federation
Abstract. The study was carried out in 2001-2015 in All-Russian Flax Research Institute in order to examine the virulence of the Tver population of flax rust agent and to search new sources of resistance that are of interest for breeding programs. The material for the study was the samples of the rust agent, test varieties (16 samples), selection lines of flax (31 lines). We used uredospores Melampsora lini for the work with the pathogen of flax, to study the phenotypes of the pathogen, to determine the resistance of cultivars and breeding lines on the light-installation (SUL-1) or under field conditions. The analysis of the general virulence of the Tver population of the flax rust pathogen in 2011-2015 showed the presence of more virulent biotypes, compared to 2001-2010, when there were mostly avirulent biotypes of the pathogen for resistant test varieties of flax (Alfa, Tverskoj, Tomsky 17, Rosinka). The accumulation of moderately virulent biotypes in the population led to the injury of the resistant test varieties Torzhoksky 4 (16.5 %), Novotorzhsky (51.7 %), etc. We registered the recurring change in the reaction of the highly resistant test varieties Priboj (3.0 %) and Zaryanka (7.0 %) to rust. The stable reaction of highly resistant test varieties Lenok, Tverskoj, Alfa and Rosinka indicates the absence of the agent of new strongly virulent races in the population of the pathogen. Twenty-five lines (M-339, M-332, P-214, P-207, etc.) were identified from 31 breeding lines of fiber flax, which demonstrated a stable immune reaction to the pathogen action during the years of the investigation (2010-2015). The lines M-307, M-322, M-324, M-329 M-330 were characterized by a group resistance to two diseases. In addition to the resistance to rust, they had the high immunity of fusarial wilt (95.3-98.6 %). The best of them (M-307, M-322, M-324, M-329 and M-330) are a promising material for the development of new varieties and are the sources of group resistance.
Keywords: flax, disease agent, rust, population, biotype, pathogen, virulence, breeding line.
Author Details: L.P. Kudryavtseva, Cand. Sc. (Agr.), leading research fellow (e-mail: VNIIL@mail. ru); L.N. Pavlova, Cand. Sc. (Agr.), deputy director; N.I. Loshakova, Cand. Sc. (Agr.), head of laboratory; O.V. Prasolova, senior research fellow.
For citation: Kudryavtseva L.P., Pavlova L.N., Loshakova N.I., Prasolova O.V. Monitoring of the Virulence of Tver Population of Flax Rust Agent and Resistance of Breeding Material. Dostizheniya nauki i tekhniki APK. 2017. T. 31. Nо. 4. Рр. 55-57 (in Russ.).