Screening of winter soft wheat varieties of Russian and foreign breeding for resistance to brown rust in the conditions of the foothill zone of the Central Caucasus

The article describes the stages of immunology testing for development winter soft wheat varieties. It also discusses issues leaf rust resistance, population structure Puccinia tritici f. sp. Eriks., methods evaluation and selection stock material selective breeding with multiple resistance genes showing high genetic diversity. 25 samples (Triticum aestivum L) obtained from N.I. Vavilov’s (VIR) plant resources gene bank 47 Thatcher isogenic lines following were used as test articles. study showed that could be considered effective to a local rust: Lr9, Lr19, Lr24, Lr25, Lr30, Lr32, Lr34, Lr36, Lr41, Lr42, Lr45, Lr47, Lr51, Lr53, Lr67.The analysis phenotypic traits allowed identifying 6 groups: MHTT, PGTT, RHTT, NHKP, ТQТР, QHKP. T-group phenotype is virulent toLr9, Lr16 has an incidence rate 40.0% typical all grain producing regions in Russia worldwide. They are predominant studied P. triticinа. rates QHKP, MHTT phenotypes avirulent Lr24 13.3, 3.3 10.0%, respectively. PGTT NHKP to, Lr26, Lr2а, Lr3 33.3%. intrapopulation variation estimated using Shannon–Weaver diversity index (H=2.51).The screening resistant varieties ranked follows: – 11, intermediate 9, susceptible 5 samples. was proposed use foreign Collection Worldwide Crop Genetic Resources (Vavilov All-Russian Scientific Research Institute Plant Industry (VIR)), such Dorota (France), Genoveva (Slovakia), Arial (Ukraine), Elton (USA), Verita Muza (Poland), Alauda (Germany), Fenezja Vatazbok Russian Prima Omskaya 5.