The paper highlights that genetic diversity of wheat is the basis for higher resistance of plants to bad environmental conditions and higher crop yield, which can be achieved by including genetic resources similar to species and varieties in the hybridization. The authors estimate the basic criteria of race non-specific resistance to leaf and stem rust of synthetic lines which contain Ae. Tausсhii genome. The Research was conducted  at the experimental field of Omsk State Agrarian University in 2016-2017. The paper explores  juvenile resistance of synthetic lines during inoculation of seedlings by 4 isolates of Puccinia triticina pathogens isolated from brown rust populations collected on wheat crops in Leningrad, Tambov, Chelyabinsk regions and the Krasnodar Territory. The authors shift the synthetic lines, which are recommended as initial material for selection on race non-specific resistance to leaf and stem rust: No. 5 Langdon / Ku-2096, No. 9 Ukr-Od 952.92 / Ae. sq.(1031), №14 Langdon / Ku -2075, №19 Ukr-Od 1530.94 / Ae. sq.(1027), No. 21 Langdon / Ku20-9, No. 22 Langdon / Ig 48042, No. 24 Aisberg / Ae. sq.(511), No. 29 Langdon / IG 126387, No. 42 UKR-Od 1530.94 / Ae. sq.(310) and No. 52 Langdon / Ku-2100. The authors identify gene resistance to brown rust and conducted genotyping of the synthetic lines by SNP-markers associated with resistant gene to stem rust Sr2. The researchers outline synthetic lines №19 UKR-Od 1530.94 / Ae. sq.(1027) which carries a combination of resistant genes  Lr34 + Lr39 (Lr41), characterized by high resistance in the later stage of development in Omsk and Leningrad regions; and №24 Aisberg / Ae. sq.(511) with age resistant  gene to stem rust Sr2, characterized by moderate resistance to stem rust populations in the conditions of Western Siberia.

/pdf/iskhodnyi-material-s-genomom-ae-tauschii-dlia-selektsii-na-ayx055jr6h.pdf

Исходный материал с геномом Ae. Tauschii для селекции на расонеспецифическую устойчивость к бурой и стеблевой ржавчине

Stem rust in recent years has acquired an epiphytotic character, causing significant economic damage  for wheat production in some parts of Western Siberia. On the basis of a race composition study of the stem rust  populations collected in 2016–2017 in Omsk region and Altai Krai, 13 pathotypes in Omsk population and 10 in  Altai population were identified. The race differentiation of stem rust using a tester set of 20 North American  Sr genes differentiator lines was carried out. The genes of stem rust pathotypes of the Omsk population are avirulent only to the resistance gene Sr31, Altai isolates are avirulent not only to Sr31, but also to Sr24, and Sr30. A low  frequency of virulence (10–25 %) of the Omsk population pathotypes was found for Sr11, Sr24,Sr30, and for Altai  population – Sr7b,Sr9b,Sr11,SrTmp, which are ineffective in Omsk region. Field evaluations of resistance to stem  rust were made in 2016–2018 in Omsk region in the varieties and spring wheat lines from three different sources.  The first set included 58 lines and spring bread wheat varieties with identified Sr genes – the so-called trap nursery  (ISRTN – International Stem Rust Trap Nursery). The second set included spring wheat lines from the Arsenal collection, that were previously selected according to a complex of economically valuable traits, with genes for resistance  to stem rust, including genes introgressed into the common wheat genome from wild cereal species. The third  set included spring bread wheat varieties created in the Omsk State Agrarian University within the framework of  a shuttle breeding program, with a synthetic wheat with the Ae. tauschiigenome in their pedigrees. It was established that the resistance genes Sr31, Sr40,Sr2 complexare effective against stem rust in the conditions of Western  Siberia. The following sources with effective Srgenes were selected: (Benno)/6*LMPG-6 DK42, Seri 82, Cham 10,  Bacanora (Sr31), RL 6087 Dyck (Sr40), Amigo (Sr24,1RS-Am), Siouxland (Sr24,Sr31), Roughrider (Sr6, Sr36), Sisson  (Sr6,Sr31,Sr36), and Fleming (Sr6,Sr24,Sr36,1RS-Am), Pavon 76 (Sr2 complex) from the ISRTN nursery; No. 1 BC 1F2 (96 × 113) × 145 × 113 (Sr2,Sr36,Sr44), No. 14а F 3(96 × 113) × 145 (Sr36,Sr44), No. 19 BC 2F3(96 × 113) × 113 (Sr2, Sr36, Sr44), and No. 20 F 3 (96 × 113) × 145  (Sr2,Sr36,Sr40, Sr44) from the Arsenal collection; and the Omsk State Agrarian  University varieties Element 22 (Sr31,Sr35), Lutescens 27-12, Lutescens 87-12 (Sr23,Sr36), Lutescens 70-13, and  Lutescens 87-13 (Sr23,Sr31,Sr36). These sources are recommended for inclusion in the breeding process for developing stem rust resistant varieties in the region.

/pdf/stem-rust-in-western-siberia-race-composition-and-effective-4rbeh8ib2a.pdf

Stem rust in Western Siberia - race composition and effective resistance genes.

Assessment of the siberian collection of spring wheat on resistance to stem rust in the southern forest-steppe of western siberia

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Assessment of the siberian collection of spring wheat on resistance to stem rust in the southern forest-steppe of western siberia