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Evaluation of CIMMYT wheat (Triticum aestivum L.) lines for seedling and adult plant resistance to stem rust (Puccinia graminis f. sp. tritici) race UG99 and its variants

Research Paper | April 1, 2018

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Mercy Odemba, James Owuoche, Michael Okiror, Ruth Wanyera

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Int. J. Agron. Agri. Res.12( 4), 53-63, April 2018


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Stem rust races Ug99 and its variants are virulent to a large number of resistant genes present in the widely grown wheat (Triticum aestivum L.) cultivars. This study was conducted to evaluate seedling and adult plant reaction to four stem rust races TTKSK, TTKST, TTKTK and TTTSK in CIMMYT wheat lines. The evaluation was conducted in the greenhouse with the adult plant resistance experiment conducted in a randomized complete block design (RCBD). Out of the 39 lines evaluated, only SRG21, SRG34 and SRG39 showed a reaction of 3 to race TTKST, SRG22 exhibited a reaction of 3 to race TTKTK, SRG25, SRG32, SRG36 and SRG37 displayed a reaction of 3 to race TTKSK and SRG27 and SRG39 showed a reaction of 3 to race TTTSK the rest revealed infection types of between 0 and 2. In the evaluation of lines for adult plant reaction to stem rust race TTKST, only 0.13% of the lines exhibited disease severity of ≤5% while 99.87% of the lines exhibited a severity of ≥10%. In contrast, 43.59% lines showed a severity of ≤5% while 56.41% showed a severity of ≥10% to races TTKTK and TTKSK. 46.15% of the lines demonstrated a severity of ≤5% while 53.85% of the lines demonstrated a severity of ≥10% to race TTTSK. Lines SRG7, SRG13, SRG24 and SRG35 showed low final disease severity, low infection types and low AUDPC with all the four races.


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