Virulence of leaf rust pathogen of wheat in South Ural
Keywords:
Puccinia triticina, Triticum aestivum, population structure, Lr-geneAbstract
Virulence analysis was carried out for the leaf rust population samples (Puccinia triticina) collected from common wheat in the Chelyabinsk region in 2017. Genes Lr24, Lr28, Lr29, Lr41, Lr42, Lr45, Lr47, Lr51, Lr53 and Lr65 were characterized as high effective at the seedling stage. The main changes of Chelyabink population included the frequency of isolates virulent to wheat lines with the genes Lr2а, Lr2b, Lr2c, Lr9, Lr11, Lr15, Lr16, Lr19, Lr20 and Lr26. According to Nei (Nei D) and Rodgers indexes of genetic distance the Chelyabink population in 2017 was more similar with that in 2016, and less with that in 2014 and 2015. At the field conditions, the high effectiveness characterized the lines ТсLr24 (0%), ТсLr18, ТсLr19, ТсLr25 (1-5%) and moderate one – ТсLr22a, ТсLr27+31, ТсLr29, ТсLr32, ТсLr37 (5-10%). The lines ТсLr17, ТсLr28 showed middle susceptibility (15–20%), and all other were highly susceptible (70–100%).