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

Abstract

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 Yr3a and Yr4a, wheat lines were developed from which Yr3a and Yr4a had been removed, while selecting for Cappelle-Desprez derived APR effective against South African pathotypes of the stripe rust fungus, Puccinia striiformis f. sp. tritici. 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, QYr.ufs-2A was identified on the short arm of chromosome 2A derived from Cappelle-Desprez, along with three QTL of smaller effect, QYr.ufs-2D, QYr.ufs-5B and QYr.ufs-6D. QYr.ufs-2D was located within a region on the short arm of chromosome 2D believed to be the location of the stripe rust resistance gene Yr16. An additional minor effect QTL, QYr.ufs-4B, was identified in the cv. Palmiet. An examination of individual RILs carrying single or combinations of each QTL indicated significant resistance effects when QYr.ufs-2A was combined with the three minor QTL from Cappelle-Desprez, and between QYr.ufs-2D and QYr.ufs-5B.

Novel Sources of Stripe Rust Resistance Identified by Genome-Wide Association Mapping in Ethiopian Durum Wheat (Triticum turgidum ssp. durum)

“…QYrEDWL.par-4B.1 , spanning the centromeric region of chromosome 4B, has been mapped in the same region of previously reported QYr-4B in French durum wheat ‘Sachem’ (Singh et al, 2013) and QYr.ufs-4B in South African spring wheat ‘Palmiet’ (Agenbag et al, 2012). QYr-4B , tagged by wPt-0872, was a pleiotropic QTL conferring effective resistance to both stripe rust and stem rust in the field.…”

Mining Centuries Old In situ Conserved Turkish Wheat Landraces for Grain Yield and Stripe Rust Resistance Genes

“…In the current study, six potentially novel QTL for resistance to stripe rust were identified in combined and individual environment analyses (Table 2) and one additional candidate novel QTL was detected exclusively in club wheat (Supplementary Table 10). The novel genomic region identified on 2DS at 28.0 cM is approximately 90–100 cM away from previously reported QTL for stripe rust response on 2DS using bi-parental populations (Bariana et al, 2001; Suenaga et al, 2003; Mallard et al, 2005; Melichar et al, 2008; Lu et al, 2009; Agenbag et al, 2012). Naruoka et al (2015) recently reported a stable APR locus on 2DS (stable in nine environments) using GWA in a winter wheat association panel.…”

A Genome-Wide Association Study of Resistance to Stripe Rust (Puccinia striiformisf. sp.tritici) in a Worldwide Collection of Hexaploid Spring Wheat (Triticum aestivumL.)

“…These results suggest that they are likely novel Pst resistance loci (Figure 6). IWA167 , one of the most significant QTL detected in this study, was mapped within the flanking markers of a weak QTL from Cappelle Desprez ( QYr.ufs-6D ; Agenbag et al 2012). However, the peak of QYr.ufs-6D was mapped on the long arm of chromosome 6D, whereas IWA167 is in the short arm.…”