Variability of the Russian populations of <em>Puccinia triticina</em> under the influence of the host plant

The article analyzes our own data and from the literature on study of plant–pathogen interactions in pathosystem Puccinia triticina host plants genera Triticum Aegilops with different ploidy genomes. We characterize long-term variability Russian populations pathogen, caused by cultivation genetically protected cultivars common wheat (T. aestivum). Differences pathogen’s virulence hexaploid species T. aestivum tetraploid durum) are shown. Data other hexaploid, tetraploid, diploid relative sp. presented. Adaptation specificity to plant were shown as key driving factors evolution divergence clonally propagating phytopathogens, which include leaf rust.