Molecular detection of stripe rust resistance genes in some Egyptian bread wheat cultivars and promising spring wheat lines
Stripe rust (yellow rust), caused by Puccinia striiformis f.sp. tritici (Pst), is a serious disease of wheat worldwide. Growing resistant cultivars is the most cost-effective and environmentally friendly approach to control the disease. Fifteen Egyptian wheat cultivars, five advanced lines, and twelve yellow rust (Yr) resistance isogenic lines were evaluated against three of the most prevalent Pst physiological races 224E132, 224E32, and 151E80 in Egypt. Infection types and diseases severity for all wheat genotypes at seedling and adult plant stages were recorded, during two successive seasons 2017/18 and 2018/19. In addition, three Sequence-Tagged Sites (STS) markers and three Simple Sequence Repeat (SSR) markers were used for detection of (Yr5, Yr15, and Yr26) and (Yr10, Yr17, and Yr18), respectively. The results revealed that Sakha-93, Sakha-95, and Misr-3 were the only wheat cultivars that showed moderated to high resistance against the three rust races, in seedling and adult plant stages in both seasons. All tested breeding lines were showed high to moderated resistance against races mixture at adult stage in both seasons. However, only breeding Line-2 and Line-5 were showed high to moderated resistance against the three races in seedling stage. Also, high resistance in both seedling and adult plant stages were observed on isogenic lines Yr5 and Yr15 against tested races. Yr5 was detected in three wheat genotypes including Sakh-95, Misr-3 and Line-2. Yr10 was found only in Sakha-93. Yr17 was existed only in Misr-3 and all breeding lines except Line-1. Yr15 was detected in seven commercial cultivars but it was not detected in any of the breeding lines. However, Yr18, and Yr26 were found in all tested wheat genotypes. Some of tested lines could be promising source for effective Yr resistance genes such as Yr5, Yr17, Yr18 and Yr26.
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