Genome-wide search for novel sources of field resistance to Ug99 and other Ethiopian stem rust races in durum wheat
Material type:
TextLanguage: English Publication details: 2012. Beijing (China) : BGRI,Description: 1 pageISBN: - 978-0-615-70429-6
| Item type | Current library | Collection | Call number | Status | Date due | Barcode | Item holds | |
|---|---|---|---|---|---|---|---|---|
| Abstract or summary | CIMMYT Knowledge Center: John Woolston Library | CIMMYT Staff Publications Collection | CIS-6942 (Browse shelf(Opens below)) | Available |
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Abstract only
Puccinia graminis f. sp. tritici, the causative agent of stem rust in wheat, is known to rapidly evolve new virulences to resistance genes. Although more than 50 Sr loci have been identified in wheat, only a few genes remain effective, particularly against the widely virulent race Ug99 (TTKSK) and various durum-specific races. Association mapping (AM) was conducted on 183 elite durum wheat accessions tested over four seasons in artificially inoculated nurseries in order to identify quantitative trait loci (QTLs) for resistance to Ug99 and durum-specific races. The panel was genotyped with 1,250 SSR and DArT markers. Twelve QTL-tagging markers with R2|values up to 11.3% were significantly associated with stem rust resistance across three or four seasons. Whereas some markers were linked to known Sr genes (e.g. Sr9, Sr13 and Sr14), other significant associations were detected in chromosome regions where no Sr genes had previously been reported. The allelic variation identified at these novel QTLs provides new opportunities to deploy marker-assisted selection to improve adult plant resistance to stem rust in durum wheat.
Genetic Resources Program|Global Wheat Program
Text in English
INT2585|CCJL01
CIMMYT Staff Publications Collection
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