Stem rust resistance in Triticum monococcum germplasm

Wheat stem rust, caused by Puccinia graminis f. sp. tritici, has been effectively controlled through the use of genetic resistance. The recently identified race TTKSK (Ug99) possesses virulence to many resistance genes that have been used in wheat breeding worldwide. One strategy to aid breeders in...

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Bibliographic Details
Published in:Phytopathology 2008-06, Vol.98 (6), p.S136-S136
Main Authors: Rouse, M N, Jin, Y
Format: Article
Language:English
Subjects:
Puccinia graminis
Triticum aestivum
Triticum monococcum
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Summary:Wheat stem rust, caused by Puccinia graminis f. sp. tritici, has been effectively controlled through the use of genetic resistance. The recently identified race TTKSK (Ug99) possesses virulence to many resistance genes that have been used in wheat breeding worldwide. One strategy to aid breeders in developing resistant varieties is to provide resistance genes transferred from wild relatives to wheat. Stem rust resistance genes Sr22 and Sr35, derived from Tritium monococcum are effective against race TTKSK. In order to identify additional genes from this wild relative of wheat, screened 1062 accessions deposited in the National Small Grains Collection against TTKSK and two additional races with broad virulence. We identified 625 accessions (58.85%) with resistance to TTKSK with infection types ranging from 0 to 2+. Among these resistant accessions, 90 accessions (8.47% of the total) were also resistant to TTTT and TRTT. Results from the preliminary screening suggested that novel resistance genes to race TTKSK are likely to be present in T. monococcum. These resistant accessions are being characterized further by testing with additional stem rust races. Crosses among selected resistant T. monococcum accessions have been initiated to determine the number and allelic relationships of stem rust resistance genes.
ISSN:0031-949X