Sr44

Data courtesy of Tom Fetch

Breeder's Toolbox

Ug99 Effectiveness:
-Virulence for the gene is known to occur in other races
-Unsuitable for utilization due to linkage with undesirable traits in the translocation
Source: RustTracker.org
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Liu et al. (2012) developed a compensating 7DL.7JS Robertsonian translocation with Sr44 from Th. intermedium. Homoeologous recombination to reduce the size of this translocation is underway. A second stem rust resistance gene from the same source and effective against isolates in the Ug99-race complex was identified on chromosome 7JL from the original donor stock. According to information for SrAgi (a synonym for Sr44) described in McIntosh et al. (1995) this latter gene was apparently not effective in early Australian studies because races virulent for Sr44 were virulent on addition line TAF2 which carried an entire 7JS chromosome pair.
Source: Mike Pumphrey, BGRI 2012 Presentation: Stocking the Breeder's Toolbox