Physiological specialization of brown rust pathogen on the wheat in Krasnoyrsk region

The research objective was monitoring of racial structure, dynamics of change of a virulence of brown rust activator and the search of effective sources of sta- bility. Long-term results of virulence analysis of natural population of causative agent of brown rust of wheat of Krasnoyarsk Region were presented. Racial and geno- typic composition of 716 monopustulan isolates of the pathogen was determined using differentiating sets of varieties of host plant. 11 physiological races of the fun- gus were identified: 10, 20, 57, 68, 77, 107, 117, 122,144, 172 and 184, depending on a year and variety, 10, 20, 77 and 122 race predominated. Every year in spore samples there were 77 races with the frequency of11.0 % in 2003 up to 96.4 % in 2016. When determining pathogenesis of pathogen on 16 isogenic lines, 47 pathotypes were identified, in the period 2000-2006, the patents SGFT-14.3 % and SGKT - 12.3 % dominated, later TJTT - 30.5 % and TJPT - 25.9 %, two - TJTT and TGTT, were noted during all the years of study...