Description:
We crossed the durum spring cultivar Kronos with the introgressed Yr78 stripe rust resistance gene ('Kronos-Yr78', PI 702944) with three susceptible recombinant inbred lines from the cross between Kronos and the susceptible durum variety Gredho (PI 532239). These lines lack the three stripe rust resistance QTLs detected in Kronos. Marker assisted selection (MAS) was used to develop F3 lines carrying the Yr78 gene and lacking the three QTLs for stripe rust resistance.