Screening of <i>Stb</i> leaf blotch resistance genes of the common wheat varieties

Abstract

Currently, leaf blotch is one of the main problems in wheat production around the world. The use of DNA markers for screening a large amount of breeding material makes it possible to identify wheat leaf blotch resistance genes quickly and accurately. In this regard, the Federal Agricultural Research Center of the North-East named after N. V. Rudnitsky conducted a search for DNA markers linked to Z. tritici resistance in the genotypes of the collection material of common wheat. There were studied 75 spring and 12 winter bread wheat varieties for the presence of the Stb2, Stb11, Stb12 and Stb13 genes. As a result, Stb leaf blotch resistance genes were found only in 8.0 % of varieties. In the genotype of the spring wheat variety ‘Irmenka 1’, there was determined the presence of three loci of resistance Stb2, Stb11 and Stb13, which were responsible for age-related and juvenile resistance to the disease. The genes of juvenile leaf blotch resistance Stb11 and Stb13 were found in the genotype of the spring common wheat variety ‘Tertsiya’. The Stb2 gene controlling age-related leaf blotch resistance was found in the genotypes of spring wheat varieties ‘Dariya’, ‘Egisar 29’ and ‘Epos’. In the genotypes of winter varieties ‘Gene’ and ‘Ble-seigle’, there were found one gene Stb11 and Stb13, respectively. The Stb12 leaf blotch resistance gene was not identified in the studied wheat varieties. All spring and winter common wheat varieties with Stb-genes can be recommended as sources of leaf blotch resistance in breeding with highly productive varieties adapted to local conditions.