Resistance to Diseases in Wheat Collection Samples and Somaclonal Variants

Abstract

More than 2000 wheat collection samples were studied for seedling resistance to 4 diseases. Noncoincidence of results obtained after inoculation of leaf segments placed on water solution of benzimidazole (60 ppm) and intact plants was found for 3 foliar diseases (leaf rust – Puccinia recondita, dark brown leaf spot blotch – Bipolaris sorokiniana and septoria glume blotch – Septoria nodorum). Sixty-three entries were resistant to leaf rust; 26 of them have gene for resistance Lr26 (non-effective under field condition), 25 – gene Lr24, 4 – gene Lr19, 8 – gene Lr9 and 2 – gene Lr41. Samples 181-5, Fielder, Butte 66, Raj 1972 and Soisson were moderately resistant to spot blotch; 181-5 – to common root rot and Moking and MN 81330 – to glume blotch. Very high level of partial resistance to 3 diseases was found in late generations of somaclonal lines of weakly and moderately resistant initial genotypes: to leaf rust in lines of cv. Spica, to leaf spot blotch – in lines of 181-5, to common root rot – in that of 181-5 and cv. Vera; moderate resistance to glume blotch was identified in lines of cv. Spica.