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GrainGenes Reference Report: TAG-104-1042

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Reference	TAG-104-1042
Title	Identification of microsatellite markers linked to Russian wheat aphid resistance genes Dn4 and Dn6
Journal	Theoretical and Applied Genetics
Year	2002
Volume	104
Pages	1042-1048
Author	Liu XM Smith CM Gill BS
Abstract	Summary: The Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is a serious economic pest of wheat worldwide. Host plant resistance is the preferred method to control RWA infestations. The identification and mapping of RWA-resistant genes and the development of resistant wheat cultivars can be facilitated through the use of molecular markers. In the present study, microsatellite (SSR) markers linked to the RWA-resistant genes Dn4 and Dn6 were identified using several F2 mapping populations derived from crosses of susceptible wheat cultivars and resistant sources. Two flanking microsatellite markers Xgwm106 and Xgwm337 are linked in coupling phase with Dn4 on the short arm of wheat chromosome 1D at 7.4 cM and 12.9 cM, respectively. Two other microsatellite markers Xgwm44 and Xgwm111 are linked to Dn6 in coupling phase near the centromere on the short arm of chromosome 7D at 14.6 cM and 3.0 cM, respectively. This is the first report on the chromosomal location of Dn6, which proved to be either allelic or tightly linked to Dn1, Dn2 and Dn5. This result of Dn6 location contradicts previous reports that Dn6 was independent of Dn1, Dn2 and Dn5. The linked markers can be conveniently used for marker-assisted selection in wheat breeding programs for the identification and/or pyramiding of Dn4 and Dn6 genes
External Databases	http://link.springer.de/link/service/journals/00122/contents/01/00831/paper/s00122-001-0831-y.pdf
Keyword	[ Hide all but 1 of 42 ] aegilops tauschii aphid aphid resistance bread wheat breeding breeding programs centromere chromosomal location chromosome d genome disease resistance diuraphis noxia gene gene mapping host host plant host plant resistance id infestation inheritance linkage map mapping method microsatellite molecular marker pest phase program pyramiding resistance resistant russian wheat aphid rwa selection source ssr susceptible wheat triticum aestivum wheat aphid resistance wheat breeding wheat cultivar worldwide

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