Mianyang Institute of Agricultural Science Mianyang Branch of National Wheat Improvement Center

Mianyang, China

Mianyang Institute of Agricultural Science Mianyang Branch of National Wheat Improvement Center

Mianyang, China
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Ren Y.,Chinese Academy of Agricultural Sciences | Ren Y.,Mianyang Institute of Agricultural Science Mianyang Branch of National Wheat Improvement Center | Li S.,Mianyang Institute of Agricultural Science Mianyang Branch of National Wheat Improvement Center | Xia X.,Chinese Academy of Agricultural Sciences | And 6 more authors.
Molecular Breeding | Year: 2015

Stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is one of the most destructive diseases of wheat (Triticum aestivum L.) in many cool and temperate regions of the world. Resistant cultivars are the most effective, economical and environmentally friendly means of controlling the disease. Chinese wheat cultivar Mianmai 37 is resistant at all growth stages to all prevalent Chinese Pst races including v26, a new Pst race virulent to resistance genes Yr24/Yr26. Genetic analysis of the F1, F2 and F2:3 populations from a cross between Mianmai 37 and susceptible line Mingxian 169 indicated that resistance to Pst race v26 was conferred by a single recessive gene, temporarily designated yrMY37. Simple sequence repeat (SSR) marker analysis placed yrMY37 on chromosome 7BL near the centromere. Eight co-dominant genomic SSR markers, Xgwm400, Xwmc758, Xwmc476, Xgwm297, Xbarc267, Xwmc364, Xwmc696 and Xwmc396, were linked with yrMY37. The closest SSR loci Xbarc267 and Xgwm297 flanked the resistance gene at 0.38 and 0.78 cM, respectively. A seedling test with 22 Pst races indicated that the reaction patterns of Mianmai 37 were different from those of lines carrying resistance genes Yr2, Yr6, Yr67 and YrZH84 on chromosome 7B. As there is no recessive stripe rust resistance gene reported on 7BL so far, we believe that yrMY37 is most likely a new stripe rust resistance gene. © 2015, Springer Science+Business Media Dordrecht.


PubMed | International Maize and Wheat Improvement Center, Mianyang Institute of Agricultural Science Mianyang Branch of National Wheat Improvement Center and Campo Experimental Valle de Mexico INIFAP
Type: | Journal: TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik | Year: 2016

New leaf rust adult plant resistance (APR) QTL QLr.cim - 6BL was mapped and confirmed the known pleotropic APR gene Lr46 effect on leaf rust in durum wheat line Bairds. CIMMYT-derived durum wheat line Bairds displays an adequate level of adult plant resistance (APR) to leaf rust in Mexican field environments. A recombinant inbred line (RIL) population developed from a cross of Bairds with susceptible parent Atred#1 was phenotyped for leaf rust response at Ciudad Obregon, Mexico, during 2013, 2014, 2015 and 2016 under artificially created epidemics of Puccinia triticina (Pt) race BBG/BP. The RIL population and its parents were genotyped with the 50K diversity arrays technology (DArT) sequence system and simple sequence repeat (SSR) markers. A genetic map comprising 1150 markers was used to map the resistance loci. Four significant quantitative trait loci (QTLs) were detected on chromosomes 1BL, 2BC (centromere region), 5BL and 6BL. These QTLs, named Lr46, QLr.cim-2BC, QLr.cim-5BL and QLr.cim-6BL, respectively, explained 13.5-60.8%, 9.0-14.3%, 2.8-13.9%, and 11.6-29.4%, respectively, of leaf rust severity variation by the inclusive composite interval mapping method. All of these resistance loci were contributed by the resistant parent Bairds, except for QLr.cim-2BC, which came from susceptible parent Atred#1. Among these, the QTL on chromosome 1BL was the known pleiotropic APR gene Lr46, whereas QLr.cim-6BL, a consistently detected locus, should be a new leaf rust resistance locus in durum wheat. The mean leaf rust severity of RILs carrying all four QTLs ranged from 8.0 to 17.5%, whereas it ranged from 10.9 to 38.5% for three QTLs (Lr46+5BL+6BL) derived from the resistant parent Bairds. Two RILs with four QTLs combinations can be used as sources of complex APR in durum wheat breeding.

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