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Adult plant resistance to stem rust (Puccinia graminis f. sp. tritici) in Pakistani advanced lines and wheat varieties

Author: Rehman, M.U.
Author: Gale, S.
Author: Brown-Guedira, G.
Author: Jin, Y.
Author: Marshall, D.
Author: Whitcher, L.W.
Author: Williamson, S.
Author: Rouse, M.N.
Author: Bhavani, S.
Author: Hussain, M.
Author: Ahmad, G.
Author: Hussain, M.
Author: Mehboob Ali Sial
Author: Mirza, J.I.
Author: Rauf, Y.
Author: Rattu, A.R.
Author: Qamar, M.
Author: Khanzada, K.A.
Author: Munir, A.
Author: Ward, R.W.
Author: Singh, R.P.
Author: Braun, H.J.
Author: Imtiaz, M.
Year: 2018
ISSN: 1835-2707
ISSN: ISSN: 1835-2693
ISSN: ESSN: 1835-2707
Abstract: After decades of effective wheat stem rust control, due mainly to use of the Sr31 resistance gene in wheat, as of the early 2000s new virulent strains of the stem rust fungus, especially the Ug99 or the TTKSK races, are spreading and overcoming the resistance of commercial varieties worldwide, including the Sr24 and Sr36 resistance genes in Kenya. To address this, researchers are working to identify new resistance sources and to develop and release new high-yielding, resistant and adapted varieties. In this study we evaluated 707 advanced spring wheat lines and varieties for adult plant resistance (APR) to stem rust at the Njoro research station of the Kenya Agricultural & Livestock Research Organization, using a modified Cobb’s scale, and for seedling resistance at the Cereal Disease Laboratory (CDL), University of Minnesota, using the 0-4 Stakman et al. (1962) scale. We found 101 lines that showed APR and, through molecular marker analysis, identified 18 lines carrying the stem rust resistance marker allele for the Sr25/Lr19 gene. Of these 18 lines, 11 were resistant to Ug99 at both the seedling and adult stages and 7 were susceptible at the seedling stage, showing infection type (IT) 3 to 4, and moderately susceptible at the adult plant stage. Another 20 lines were resistant at all stages of development, without Sr25/Lr19 marker allele indicated the possibility of carrying other genes for stem rust resistance. We shared the results with national program breeders and scientists in Pakistan to facilitate the use of resistant lines in crossing programs and enhance stem rust resistance in candidate wheat varieties. As a result number of lines resistant to Ug99/ and its variants (TTKSK, TTKST) have been identified and released as commercial varieties, including NR-397 (Pakistan-2013) and NR-356 (NARC-2011).
Format: PDF
Language: English
Publisher: Southern Cross Publishing-Australia
Publisher: Southern Cross Publishing Group
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the sutable license for that purpose.
Type: Article
Place of Publication: Australia
Pages: 1633-1639
Issue: 10
Volume: 12
DOI: 10.21475/ajcs.18.12.10.p1226
Keywords: Disease Severity
Keywords: Race Non-Specific Resistance
Keywords: Ug99
Keywords: Wheat Rust
Journal: Australian Journal of Crop Science

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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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