QTL mapping of adult-plant resistance to stripe rust in a population derived from common wheat cultivars Naxos and Shanghai 3/Catbird

Abstract

Stripe rust, caused by Puccinia striiformis Westend. f. sp. tritici Erikss., is a severe foliar disease of common wheat (Triticum aestivum L.) worldwide. Use of adult-plant resistance (APR) is an efficient approach to provide long-term protection of crops from the disease. The German spring wheat cultivar Naxos showed a high level of APR to stripe rust in the field. To identify the APR genes in this cultivar, a mapping population of 166 recombinant inbred lines (RILs) was developed from a cross between Naxos and Shanghai 3/Catbird (SHA3/CBRD), a moderately susceptible line developed by CIMMYT. The RILs were evaluated for maximum disease severity (MDS) in Sichuan and Gansu in the 2009-2010 and 2010-2011 cropping seasons. Composite interval mapping (CIM) identified four QTL, QYr.caas-1BL.1RS, QYr.caas-1DS, QYr.caas-5BL.3 and QYr.caas-7BL.1, conferring stable resistance to stripe rust across all environments, each explaining 1.9-27.6, 2.1-5.8, 2.5-7.8 and 3.7-9.1 % of the phenotypic variance, respectively. QYr.caas-1DS flanked by molecular markers XUgwm353-Xgdm33b was likely a new QTL for APR to stripe rust. Because the interval between flanking markers for each QTL was less than 6.5 cM, these QTL and their closely linked markers are potentially useful for improving resistance to stripe rust in wheat breeding.

Loci associated with resistance to stripe rust (Puccinia striiformis f. sp. tritici) in a core collection of spring wheat (Triticum aestivum)

“…1_GWAS , respectively), which were mapped in close proximity to the IWA7306 locus. Similarly, Zwart et al [45] and Ren et al [44] reported two QTL, QYr . sun-7A_CPI133872 and QYr .…”

“…caas-1BL . 1RS_SHA3/CBRD , was also mapped close to the region of IWA1191 (4.6–6.3 cM) [44], which could be related to IWA1191 .…”

Quantitative trait loci of stripe rust resistance in wheat

“…1. Chromosome 1A had four QTLs described (Bariana et al 2010; Dedryver et al 2009; Ren et al 2012a; Rosewarne et al 2012). The flanking markers of these form two distinct groups although they are both on the long arm of chromosome 1A.…”

“…There were three QTLs identified on Chromosome 1DS (Ren et al 2012a; Vazquez et al 2012, Zwart et al 2010), all with relatively minor and inconsistent effects against the pathogen. These loci probably form two separate regions with the Stephens (Vazquez et al 2012) and CPI133872 (Zwart et al 2010) QTLs being in the telomeric region of 1DS.…”

Identification and mapping stripe rust resistance gene YrLM168a using extreme individuals and recessive phenotype class in a complicate genetic background

“…Five QTLs, QYr. jirc-6B (Suenaga et al 2003), QYr.inra-6B (Dedryver et al 2009), QYr.caas-6BS (Lan et al 2010), QYr.caas-6BS.2 (Ren, Y et al 2012a), and QYr.caas-6BS.3 (Ren, Y et al 2012b) explained phenotypic variation less than 10 %. These QTLs explained part of the phenotypic variance, but YrLM168a confers complete resistance as a single gene.…”