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Genetic mapping of Dn7, a rye gene conferring resistance to the Russian wheat aphid in wheat.
- Source :
-
TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik [Theor Appl Genet] 2003 Nov; Vol. 107 (7), pp. 1297-303. Date of Electronic Publication: 2003 Jul 19. - Publication Year :
- 2003
-
Abstract
- The Russian wheat aphid is a significant pest problem in wheat and barley in North America. Genetic resistance in wheat is the most effective and economical means to control the damage caused by the aphid. Dn7 is a rye gene located on chromosome 1RS that confers resistance to the Russian wheat aphid. The gene was previously transferred from rye into a wheat background via a 1RS/1BL translocation. This study was conducted to genetically map Dn7 and to characterize the type of resistance the gene confers. The resistant line '94M370' was crossed with a susceptible wheat cultivar that also contains a pair of 1RS/1BL translocation chromosomes. The F(2) progeny from this cross segregated for resistance in a ratio of 3 resistant: 1 susceptible, indicating a single dominant gene. One-hundred and eleven RFLP markers previously mapped on wheat chromosomes 1A, 1B and 1D, barley chromosome 1H and rye chromosome 1R, were used to screen the parents for polymorphism. A genetic map containing six markers linked to Dn7, encompassing 28.2 cM, was constructed. The markers flanking Dn7 were Xbcd1434 and XksuD14, which mapped 1.4 cM and 7.4 cM from Dn7, respectively. Dn7 confers antixenosis, and provides a higher level of resistance than that provided by Dn4. The applications of Dn7 and the linked markers in wheat breeding are discussed.
- Subjects :
- Animals
Chromosomes, Plant genetics
DNA, Plant genetics
DNA, Plant isolation & purification
Genetic Markers
Molecular Sequence Data
North America
Plant Diseases genetics
Plant Diseases parasitology
Polymorphism, Restriction Fragment Length
Triticum parasitology
Aphids physiology
Chromosome Mapping
Genes, Plant genetics
Immunity, Innate genetics
Secale genetics
Triticum genetics
Subjects
Details
- Language :
- English
- ISSN :
- 0040-5752
- Volume :
- 107
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
- Publication Type :
- Academic Journal
- Accession number :
- 12879254
- Full Text :
- https://doi.org/10.1007/s00122-003-1358-1