Identification of adult plant resistance to stripe rust in the wheat cultivar Cappelle-Desprez

Following the appearance of stripe rust in South Africa in 1996, efforts have been made to identify new sources of durable resistance. The French cultivar Cappelle-Desprez has long been considered a source of durable, adult plant resistance (APR) to stripe rust. As Cappelle-Desprez contains the seedling resistance genes and wheat lines were developed from which and had been removed, while selecting for Cappelle-Desprez derived APR effective against South African pathotypes of the stripe rust fungus, f. sp Line Yr16DH70, adapted to South African wheat growing conditions, was selected and crossed to the stripe rust susceptible cultivar Palmiet to develop a segregating recombinant inbred line mapping population. A major effect QTL, - was identified on the short arm of chromosome 2A derived from Cappelle-Desprez, along with three QTL of smaller effect, -- and -- was located within a region on the short arm of chromosome 2D believed to be the location of the stripe rust resistance gene . An additional minor effect QTL, - was identified in the cv. Palmiet. An examination of individual RILs carrying single or combinations of each QTL indicated significant resistance effects when - was combined with the three minor QTL from Cappelle-Desprez, and between - and -.