Population characteristics of Puccinia recondita Rob. ex Desm. from the Middle Volga frequency virulence by LR wheat resistance genes in 2014

According to the research in 2014 confirmed the affiliation of Ulyanovsk and Bezenchuk populations of Puccinia recondita in a single areal formation and distribution of leaf rust. At the same time shows a significant similarity between the structure of Middle subpopulations with the structure of the population of the North Caucasus. In 3 regions no clones of the pathogen virulent to seedlings lines with genes Lr 9, Lr 19, Lr 24, Lr 28, Lr 47 and Lr Ag # 2. By gene Lr 29 was virulent Only one clone of Bezenchuk. It is shown that the dynamics of consistent concentration of virulence genes plr1, plr2a, plr23, plr25, plr35 during 2011-2014. subpopulations in the Middle Volga. For most of the genes significantly change the concentrations observed. As genes plr1, plr25 and plr35 synchronously in both subpopulations decrease concentration, and the genes and plr2a plr23 - increasing the concentration. We discuss the possibility of expanding the phenotypic markers rust pathogen by examining the virulence of isolates single-pustuled leaf segments differentiators placed on various substrates (solutions benzimidazole, nitrogen and potassium salts).