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An isolate of Puccinia striiformis f. sp. tritici “Warrior” race (avirulent to Yr5 and Yr15 resistance genes) was used in the study to test resistance among winter wheat cultivars. The examined plant material consisted of eighty-three winter wheat cultivars and lines with resistance genes to yellow rust Yr5 and Yr15. The pathology tests were conducted on the seedlings under controlled conditions. Plant symptoms caused by infection were evaluated 12–14 days after inoculation using 0–9 scale. Six cultivars were found to be resistant to Pst isolate (score 0–4), and only the cultivar Belenus and lines with genes Yr5 and Yr15 were completely immune (score 0). Nine cultivars revealed intermediate resistance (score 5–6) and 67 were susceptible (score 7–9). Additional experiments were carried out to identify genes Yr5 and Yr15 among tested wheat cultivars by using molecular markers. The results demonstrated that phenotypic and molecular results were consistent only for Belenus cultivar, which indicated the presence of Yr15 in this cultivar.

Resistance of winter wheat cultivars to yellow rust caused by Puccinia striiformis f. sp. tritici