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Mapping quantitative trait loci in wheat for resistance against greenbug and Russian wheat aphid



Mapping quantitative trait loci in wheat for resistance against greenbug and Russian wheat aphid



Plant breeding = Zeitschrift fur Pflanzenzuchtung 123(4): 361-365



Breeding for genetic resistance against greenbug and Russian wheat aphid (RWA) is the most effective way of controlling these widespread pests in wheat. Earlier work had shown that chromosome 7D of a synthetic hexaploid wheat, 'Synthetic' (T. dicoccoides Ae. squarrosa) (AABB DD) gave resistance when transferred into the genetic background of an aphid-susceptible cultivar, 'Chinese Spring', as the recipient. To map the genes involved, a set of 103 doubled haploid recombinant substitution lines was obtained from crossing the 7D substitution line with the recipient, and used to determine the number and chromosomal location of quantitative trait loci (QTL) controlling antixenosis and antibiosis types of resistance. Antixenosis to RWA was significantly associated with marker loci Xpsr687 on 7DS, and Xgwm437 on 7DL. Antibiosis to greenbug was associated with marker loci Xpsr490, Rc3 (on 7DS), Xgwm44, Xgwm111, Xgwm437, Xgwm121 and D67 (on 7DL). Similarly, antibiosis to RWA was linked to loci Xpsr490, Rc3, Xgwm44, Xgwm437 and Xgwm121. At least two QTL in repulsion phase, one close to the centromere either on the 7DS or 7DL arms, and a second distal on 7DL could explain antibiosis to RWA and, partially, this mechanism against greenbug.

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Accession: 004228395

Download citation: RISBibTeXText

DOI: 10.1111/j.1439-0523.2004.00995.x


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